guidelines for designers / builders IC - Bord Gais Networks

Bord Gáis Networks Requirements and Technical Recommendations for
Connecting Industrial and Commercial (Non–Domestic) Gas Loads.
guidelines for designers /
builders
IC

Definition
In the context of this guidance document, an industrial / commercial connection constitutes the
addition of any non-domestic gas load to the natural gas distribution network.
Table of Contents
section 1:
introduction
• Table of Contents 2
• Introduction 4
• Scope / Irish Standards 5
section 2:
The benefits of natural gas
• Why Natural Gas? 6
• Electricity Generation CHP 7
• Space Heating 8
• Water Heating 9
• Catering 9
• Cooling 9
Section 3:
Organising a natural gas connection 10
Section 4:
Site work guidelines 12
• Gas Main Guidelines 13
• Site Ground-Work Guidelines 13
• Gas Services Requirements 14
Section 5:
Meter types & specifications
• Gas Load Categories 15
• Specifications of Commercial and Industrial
• Meter Types 16
• On-Site Fabricated Meter Assemblies 17
• Meter Modules 18
• Skid Units 19
• Base Requirements for Skid Units 21
• Guidelines for Positioning Pressure
• Reduction and Meter Installations 22
• Steel Cage Protection 24
• Purpose Built Meter Compartments 25
• Locating Meters inside the Building 27
• Meters Positioned in open Basement Areas 28
2

Section 6:
Installation pipework downstream of the meter
• Gas Supply Pipework 29
• Service Shafts 34
• Installation Pipework 36
• Appliance Connections 37
• Means of Isolation 37
• Material Selection 38
• Corrosion Protection 38
• Jointing 39
• Pipework Support 40
• Pipes in Voids 40
• Sleeving 41
• Pipe Sizing 42
• Conversion Tables 44
• Safety Devices 45
• Design for Protection in Case of Fire 45
• Identification of Pipework 46
• Equipotential Bonding 46
• Marking of Meters & Supply Pipework 46
Section 7:
Non-domestic premise certification
• The Non-Domestic Certificate 47
• Steps to Getting Meter Fitted 48
• Completing the Declaration of Conformance 48
• Testing of Pipework 50
• Strength and Soundness Testing 51
• Flue Testing 52
• Ventilation 52
• Project Manager/Gas Installer Responsibility 53
• Operator Responsibility 53
Section 8:
Appendix:
• Gas Market Deregulation Terminology 54
• Gas Load Terminology 55
• Technical Terminology 56
• Connections Form (Sheet 1 & 2) 61
• Applicable Standards for Industrial/Commercial
• Installations 64
3

Section 1: Introduction
Introduction: from shore to door
Natural gas is found in large basins underneath the
earth’s surface. Once brought from underground,
the natural gas is treated to remove impurities like
water, sand, and other compounds. After this cleaning
process, a trace of a proprietary chemical is added to
give the natural gas its identifiable odour before it is
transmitted through a network of pipelines to its point
of use.
Since its establishment, Bord Gáis has developed a
combined Transmission and Distribution pipeline
network of 11,318km (year end 2005). The system is
linked to UK and Continental gas markets through two
subsea interconnector pipelines. Natural gas is now
available in over 100 population centres within 19
counties throughout the country with over 540,000
gas users in Ireland.
Businesses in Ireland have increasingly adopted natural gas as the preferred fuel for:
Steam Generation
typical applications include
industrial processes and electricity
generation.
Combined Heat and Power (CHP)
typical applications include hospitals,
large hotels and leisure centres.
Heating, Hot Water and Cooking
typical applications include hospitals,
shopping centres, factory workshops,
offices, restaurants and public houses.
If you OWN or MANAGE a business and you are considering a connection to the natural gas
network, then this booklet will be of assistance to you.
4

Scope / Irish Standards:
This document has been prepared for the prospective
gas customer, the construction industry professional
and the mechanical contractor who wish to connect to
the natural gas network.
This booklet is a guidance document for natural
gas distribution systems at pressures less than 5bar.
Gas mains, services and meters transporting gas at
pressures greater that 100mbar are not permitted
inside the building line 1 of occupied properties.
Consult Bord Gáis Networks for site specific
clarification.
Information contained within this document includes
gas mains and service requirements, technical guidance
relating to gas meters for a range of gas loads and
installation requirements downstream of the meter.
This document contains practical guidance and should
not be a substitute for the current Irish Gas Standards,
the Technical Guidance Documents (Building
Regulations) or the Local Government (Multi-Storey
Buildings) Act 1988.
The requirement for the safe and efficient supply of
piped natural gas to industrial/commercial premises (at
meter outlet pressures less than 5bar) are contained
in the current edition of I.S.820, “Non-Domestic Gas
Installations”.
The requirements for the installation of domestic type
appliances in non-domestic buildings are set out in I.S.
813, “Domestic Gas Installations”. The requirements
for the pipework supplying these appliances is included
in I.S. 820 “Non-Domestic Gas Installations”.
The requirements relating to the installation or
maintenance of industrial process equipment, be it
either an appliance or a piping system, is not included
in this booklet.
For guidance on industrial installations with a
maximum operating pressure greater 0.5bar (500mbar)
or installation requiring a supply pressure exceeding 5
bar consult I.S./EN 15001-2.
In the event of any conflict between this document and
the relevant Irish Standards, the current edition of the
Irish Standard should prevail.
All values for length are in millimetres unless otherwise
stated.
1, 2, 3 Refer to Section 8:
Appendix – Terminology.
As stated in Irish Standard I.S.820, only competent
persons 2 are permitted to design, construct and
commission gas installation pipework. The standard
also states that competent personnel should only
commission gas consuming equipment and appliances.
Competent persons engaged in the design of gas
installations and in gas installation work should comply
with the current Building Regulations and the Local
Government (Multi-Storey Buildings) Act 1988.
The work and responsibility of the installation designer
and mechanical contractor begins at the point
of delivery 3 and continues up to and including all
installation pipework and gas consuming equipment.
5

Section 2: The benefits of natural gas
Why natural gas?
Since the 1980’s more and more energy users have
adopted natural gas as their primary source of fuel for
heating, cooking and processing. Currently there are in
excess of 540,000 customers connected to the natural
gas network in Ireland.
There are several reasons why the change to natural
gas has taken place:
• Optimising use of valuable space – with natural
gas there is no need for an on site tank, external
boiler house or excessively large installations
consuming premium landscape, commercial or
parking space.
With all of the benefits above there is no doubt that
when combined with modern equipment a natural
gas connection can reduce the running costs of your
property.
There are many applications of natural gas and a
range of appliances available to complement each
application. The following pages provide examples of
natural gas in use. For more information and details
on particular appliances please contact a natural gas
appliance and equipment supplier.
• Compact reliable appliances – due to the clean
combustion of gas, often the appliances and
equipment are smaller than for alternative fuels.
This cleaner combustion process also means
natural gas appliances and equipment are more
reliable and often easier to maintain. Space usage
within the building is thus optimised and costs
reduced with high fuel efficient equipment.
• Natural gas is very versatile and has many uses
– from cooking to heating to generating a site’s
electrical requirements through Combined Heat
and Power (CHP), see page 7 for further details.
• There are fewer carbon emissions with natural
gas than with other fuels. Gas is cleaner
than alternative fossil fuels as it
produces less harmful pollutants during
combustion, hence making it a more
environmentally friendly fuel and suited to direct
firing applications.
• Natural gas is piped directly from a national and
European network and is always ‘on-tap’. You
only pay for natural gas when you use it, not in
advance. There is no need to worry about on site
storage, circulatory or conditioning systems.
• Gas remains the most cost effective fuel on the
market. See the Sustainable Energy Ireland’s
website at www.sei.ie for the most up-to-date
fuel price comparisons. The price of natural
gas is regulated by the Commission for Energy
Regulation (CER).
6

Large Processing Loads and Large Electricity
Generation Facilities:
Very large natural gas consuming processing
plants require a connection directly from high
pressure transmission pipelines. Bord Gáis Networks
transmission pipelines provide natural gas to
numerous facilities in the Republic of Ireland, as well
as an electricity generating station in Northern Ireland
and on the Isle of Man.
The Bord Gáis Network transmission and distribution
network can be viewed on the internet at www.
bordgais.ie.
The requirements relating to the installation
or maintenance of industrial process
equipment, be it either an appliance
or a piping system, are not included in
this booklet. For guidance on industrial
installations with maximum operating
pressure greater than 0.5bar (500mbar) or
any installation requiring a supply pressure
exceeding 5bar. Reference can be made to
I.S./EN 15001-2.
Combined heat and power (CHP):
CHP uses gas to provide both heat and electrical
power. The CHP unit burns gas to power a generator
which in turn creates electricity. This electricity is then
fed into the main fuse board for the site, reducing the
electricity demand from the national grid. The result is
lower electricity costs for the end user. The heat from
gas combustion is used to heat water in the usual way
for the heating system. This process results in very high
efficiencies and an overall fuel cost reduction for the
property.
An added advantage is that as a site is generating part
or all of its power, if there is a failure on the electricity
grid, power will still be available to maintain essential
operations. Larger CHP users can sell excess electricity
back to their electricity supplier and so reduce their
electricity bills even further.
CHP has become an innovative solution for hotels
in Ireland, in particular large hotels that have leisure
facilities and swimming pools. As more towns in
Ireland are connected to the natural gas network and
technology has become more advanced, it is now
possible for small CHP units to become a more viable
option for a greater range of applications.
Figure 1:
The operating principles of CHP installation
10% to 20%
Waste
Electricity, Heat and Hot Water
80% to 90% efficiency
Natural Gas
Meter
C.H.P.
Factory,
Hospital, Hotel
or Leisure
Centre
100% Energy Input
Figure 2:
CHP unit
7

Space heating:
There are several ways natural gas can be adopted to provide the heating of premises. Below
are just some of the options available.
Warm Air Heaters
Warm air heaters are available in multiple
formats such as free-standing, wall or
ceiling mounted, all of which have different
heat output ranges. The heaters are a tried
and tested method of cost effective heating.
They can form part of warm air curtains
above doors and loading bays.
Radiant Heaters
Gas fired radiant heaters have particular
useful applications within large open areas.
These units only direct heat to a desired
area. There are two types of gas fired
radiant heaters, radiant plaques or radiant
tubes. Both utilise a radiant surface which
directs heat to the desired area.
Central Heating Boilers
Central heating boilers are available in
a wide array of sizes and heat outputs,
meeting the needs of domestic and
commercial customers. Condensing warm
air heaters are also available which function
in a similar fashion and can operate at
efficiencies in excess of 95%.
Balanced-Flue Convector Heaters
These units are small convenient heaters for
smaller buildings and premises requiring
intermittent heating, such as offices and
small shops. These are local heaters which
combust gas, releasing heat to the desired
area and release products of combustion to
atmosphere via their own flue.
Figure 4:
Decorative Fuel Effect Fire
Figure 3:
Small Commercial (Domestic Type)
Central Heating Boiler
Figure 5:
Warm Air Heater
8

Water heating:
Central Heating Boilers
The standard domestic central heating boiler or
multiples interlinked provide both the heating and hot
water requirement. In certain instances, a separate
smaller boiler with a calorifier can be more efficient,
while gas fired appliances which heat the water
directly are even more efficient.
Instantaneous Water Heaters
Instantaneous water heaters are ideal for local small
quantities of hot water. There are a range of appliances
available which can heat several litres of water per
minute.
Storage Water Heaters
These gas heaters have a high recovery rate which
can reduce the need for large on site storage. There
is a broad range of models available and these are
particularly suited to large quantities of hot water,
stored either centrally or local to usage.
Figure 6:
Storage Water Heater
Catering:
Natural gas is the fuel of choice for professional
caterers; its flexibility and instant response make it the
fuel that is in greatest demand for chefs today. There
are a wide range of gas cooking appliances available,
from small restaurants to large hotel kitchens.
Equipment such as convection ovens, deep fat fryers,
griddles, combination ovens and gas ring hobs give
the full range of applications. Gas heated dishwashing
machines are available for cleaning of cutlery,
glassware and crockery. Appliances specifically for the
fast food industry, such as gas heated conveyor boilers
and fryers are also available.
Figure 8:
Kitchen and Catering Equipment
Cooling:
Gas fired absorption chillers have a very low level of
noise and vibration. The majority of units are available
as chillers/heaters which provide cooling and heating
operations from the one unit. This dual functionality
provides efficient and therefore economic operation.
Figure 7:
Central Boiler
9

Section 3: ORGANISING A NATURAL GAS CONNECTION
Information required for a gas connection:
To process your application for a gas
connection it is essential that the following
information is provided to Bord Gáis
Networks. The listing below highlights the
minimum required to design the connection
and accurately evaluate the capital
contribution required.
a. Connections Form 4
b. Site Location Drawing (to be sent to plans@bge.ie)
c. Proposed Meter Locations shown on Drawing (to be sent to plans@bge.ie)
d. Estimated Annual Consumption (EAC) 5 (or, note point y below)
e. Maximum Hourly Quantity (MHQ) of Gas Required 6
f. Pressure Required (Meter outlet pressure normally provided at 21mbar)
g. Details of Possible Future Loads
x. Minimum Hourly Quantity (average)
(Only required if Category 3 Connection, see table on page 15)
y. Historic Fuel Bills
(Only required when premise is changing over from an alternate fuel)
z. Gas Point Registration Number, GPRN 7
(Only required if alteration to the existing meter or service required)
Table 1:
The information required to organise gas connection.
Natural gas is delivered through a pipework
distribution system and supply pressures vary
in accordance with the design and operation
of the system local to the premise being
connected. To confirm availability of necessary
gas volume and pressure contact Network
Connections at 1850 427 747.
The route for supplying natural gas to a
building and final location of the point of
delivery 8 (normally the meter) is decided by
Bord Gáis Networks following consultation
with the customer or the customer’s
nominated representative.
The gas main, service, pressure reduction and
primary meter(s) remain the property of Bord
Gáis Networks.
Installations are designed to deliver 21mbar,
unless otherwise requested. Bord Gáis
Networks do not supply gas at pressures
greater than those available from the local
network 9 .
In accordance with the current CER
Connections Policy, a design fee is applicable
for large connection applications with an
Estimated Annual Consumption (EAC)
above a published value. Consult the Bord
Gáis Networks website for further details,
www.bordgais.ie.
Refer to Appendix for Connections Form and
Page 11 for the schedule to Coordinate a
Natural Gas Connection.
4
A Connections Form should be
completed for all connection requests.
A sample form is provided in Section 8
of this booklet. An electronic version is
available on request from connect@
bge.ie and on the internet at www.
bordgais.ie
5
, 6 , 7 , 8 , 9 Refer to Section 8: Appendix –
Terminology.
10

Project Number Assigned:
Schedule for Co-ordinating Business Connections
DESIGN PHASE - Bord Gáis Networks DATE:
1. Customer/Customer’s Representative contacts Bord Gáis Networks on 1850 427 747 to acquire
details of existing gas network in area.
2. Customer/Customer’s Representative contacts Bord Gáis Network Connections on
1850 427 737 requesting a Connections Form. This should be completed and returned with a
site location map and site layout drawings to plans@bge.ie.
. . . / . . . / . . .
. . . / . . . / . . .
3. Bord Gáis Networks will arrange a meeting to agree the network route and positioning of gas
meters and ancillary equipment prior to proceeding with project design and estimation. Private
way leave agreements to be sought by Customer where applicable.
. . . / . . . / . . .
4. When the above details are finalised, Bord Gáis Networks design the gas connection and
provide written quotation, proposed gas network drawings and contract documents to
the Customer.
5. Customer returns signed contract with connection fee.
6. Bord Gáis Networks seek way-leave permissions from local authorities.
CONSTRUCTION PHASE - Bord Gáis Networks
. . . / . . . / . . .
. . . / . . . / . . .
. . . / . . . / . . .
1. Customer’s project manager contacts Bord Gáis Networks on 1850 427 747 to acquire details
of existing gas network within scope of site and safety labels for site.
2. Customer’s project manager liaises with Bord Gáis Networks pipe laying contractor to
co-ordinate site works.
FINAL METER CONNECTION - Natural Gas Supplier
1. Consumer contacts a natural gas supplier and agrees terms of supply (Referencing their
GPRN).
. . . / . . . / . . .
. . . / . . . / . . .
. . . / . . . / . . .
2. Mechanical Contractor / Heating Installer prepares installation for meter fit, completes the “BGN
Office Copy” of the Non-Domestic Certificate of Conformance and faxes it to
1850 211 447.
3. Consumer requests fitting of meter through their gas supplier (Not Bord Gáis Networks).
. . . / . . . / . . .
. . . / . . . / . . .
4. Bord Gáis Networks fit the meter after request from the consumers’ nominated natural gas
supplier (if the Certificate of Conformance is completed and available on site).
. . . / . . . / . . .
Individual GPRN Number(s) Assigned to each Gas Meter to be Fitted:
11

Section 4: site work requirements
Site work guidelines
Cabinet containing gas
meter and
pressure
regulator
Pavement
Carriageway
Gas
Distribution
Mains
GAS
Supply
Pipework
Gas
Service
External
Isolation
Valve
I.S 820
I.S 265
Service
Top Tee
200mm
Figure 9:
The Gas Mains Service and Meter.
I.S 329
Note:
• Gas mains, services and meters transporting gas at
pressures greater than 100mbar are not permitted
inside the building line of occupied buildings
190mm
The external isolation valve
and access cover should
remain accessible at all
times.
• PE piping is not permitted inside the building
• The service should travel as near perpendicular to the
gas main as possible
12

Gas mains (i.S. 329)
All gas mains should be installed by Bord Gáis
Networks or a Bord Gáis Networks appointed
contractor. On new–build projects, the builder
normally provides a pre-excavated trench.
All trenches constructed for the purpose of
accommodating gas main should allow for a
minimum cover of 750mm. Gas mains should not
be laid with cover greater than 1200mm, unless
specified by Bord Gáis Networks.
with other utilities / services or drainage / sewage
systems. A distance of 300mm should be provided
when a gas main is placed adjacent to an
inspection chamber (note Figure 10 below).
Gas
Main
Water
Main
The total trench width should amount to outside
diameter of gas pipe, plus 300mm.
Sand or pea gravel, 150mm minimum should
surround the gas main. The trench should be
reinstated as soon as practicable after the main is
laid so to reduce the possibility of damage on site.
The typical layout of a gas main in a footpath is
shown in Figure 11 below.
Inspection
Chamber
(Manhole)
300mm
min
3
Site ground-work
Guidelines
Under no circumstances may the
gas main be included in an inspection chamber
Figure 10:
Permissible proximity of gas mains to inspection chambers
Note:
Other utilities/ducts should not be laid on top of gas
main/service
Boundary Wall
750mm minimum cover required beneath roads
650mm minimum cover required beneath
footpaths and landscape areas
300
600mm minimum distance between high
voltage mains & gas mains
Granular Material
Elec/Telecom
Ducts
Marker tape
250mm
150mm Compacted
Sand Surround
Section Drawing
Gas main
300min
Water Main
Figure 11: Trench requirements for gas mains.
13

GAS SERVICES (I.S. 265)
All gas services should be installed by Bord Gáis
Networks or a Bord Gáis Networks appointed
contractor in a pre-excavated trench, normally
provided by the builder. Any extra site works required
by Bord Gáis Networks will incur additional charges.
• All new industrial and commercial services should
incorporate an underground service isolation
valve which should remain accessible to
Bord Gáis Networks and the Emergency Services.
The gas service should be laid in a straight line to the
meter location, as near perpendicular to the gas main
as practicable.
• Mains, services and meters transporting gas at
pressures greater than 100mbar may not be
positioned within the building line of occupied
premises (as defined by I.S.329 / I.S.265).
• For more detailed information, always refer to
the Bord Gáis Networks drawings specific to the
project.
Service Requirements:
1. The trench for the gas service to each meter
location should be excavated to a sufficient
depth to allow a minimum cover of 600mm.
In the case where the service supplies a single
G4 meter box (per page 17) with a single meter
contained within, 600mm minimum cover is
required up to 1.5 metres from the meter box.
Within the remaining 1.5 metre distance, cover
may reduce to a minimum of 375mm to the base
of the GRP sleeve (note Figure 9 on page 12).
5. Marker tape (provided by the Bord Gáis Networks
contractor) should be placed over all gas mains,
services and ducting intended for gas distribution
pipe insertion at a later date.
6. Bord Gáis Networks should be consulted if it is
proposed to place the service in a sleeve or duct.
2. All gas trenches should be excavated to the width
of the outside diameter of pipe, plus 300mm.
3. Sand or pea gravel, 150mm minimum should
surround the gas service.
4. Where the necessity to cross or run in close
proximity to any other utility occurs, a minimum
clearance of 300mm is required.
14

Meter types & specifications
Industrial and Commercial customer gas meters can be
classified into the following three categories:
Peak gas load (gl) categories
CATEGORY 1: Generally On-Site Fabrications
Peak gas load less than 165 kWh
(GL < 563,003 BTU’s)
G4, G10 – METERS:
(Refer to page 17 for further details)
Step 1:
Meters fitted on-site by Bord Gáis Networks meter fitter, after
receipt of Declaration of Conformance, refer to Section 7.
CATEGORY 2: Generally Meter Modules
Peak gas load greater than 165 kWh and less than 1,035 kWh
(563,003 BTU’s < GL < 3,531,566 BTU’s)
G16, G25, G40, G65 - METER MODULES:
(Refer to page 18 for further details)
Step 1:
Step 2:
Meter modules manufactured off-site
Module fitted and meter commissioned on site after
receipt of Declaration of Conformance, refer to Section 7.
CATEGORY 3: Generally Skid Units
Peak gas load greater than 1,035 kWh
(GL > 3,531,566 BTU’s)
G100, G160, G250, G400, G650, SP1, SP2 - SKID UNITS:
Step 1:
Step 2:
Step 3:
Step 4:
Step 5:
Pressure Reduction Skid manufactured off-site (refer to pages
19 & 20)
Concrete Base placed in Bord Gáis Networks agreed position
by client or builder (refer to page 21)
Pressure Reduction Skid placed on concrete base
Protection is placed around the skid installation
Meter fitted and commissioned on-site after receipt of
Declaration of Conformance, refer to Section 7.
Table 3: The Range of Gas Meters available
The meter will not be fitted unless any required meter protection has been installed.
15

Meter Maximum On-Site Fab, Module Compartment Base Fitting needed
Type: Flow Rate or Skid Delivery: Type / Size: Required? for outlet pipe
m 3 /h (kWh)
G4 6 m 3 /h On-Site Fabrication Meter Box No
Meter On-Site Fabrication Manifold No 3
/ 4
inch
(63 kWh) Module + Fitter Six Meter No Copper
Fabrication
Cabinet
G10 16 m 3 /h Module (LP) 1020h x 850w x 260d No 1.5 “ BSTP
Fitter Fabrication (LP) 600h x 600w x 200d No 1.5 “ BSTP
(166 kWh) Module (MP) 1020h x 850w x 260d No 1.5 “ BSTP
Fitter Fabrication (MP) 600h x 600w x 200d No 1.5 “ BSTP
G16 20 m 3 /h Module (LP) 580h x 850 w x 280d No 1.5 “ BSTP
(210 kWh) Module (MP) 1000h x 450w x 250d No 1.5 “ BSTP
G25 32 m 3 /h Module (LP) 1020h x 680w x 280d No 1.5 “ BSTP
Module (MP) 1020h x 680w x 260d No 1.5 “ BSTP
(340 kWh)
G40 52 m 3 /h Module (LP) 1300h x 750w x 330d No 2 “ BSTP
Skid Unit (LP) 2000h x 1350w x 800d Yes 50mm PN16 flange
(550 kWh) Module (MP) 1300h x 650w x 350d No 2 “ BSTP
Skid Unit (MP) 2000h x 1350w x 800d Yes 50mm PN16 flange
G65 80 m 3 /h Module (LP) 1100h x 980w x 350d No 2 “ BSTP
Skid Unit (LP) 2000h x 1350w x 800d Yes 50mm PN16 flange
(840 kWh) Module (MP) 1300h x 750w x 350d No 2 “ BSTP
Skid Unit (MP) 2000h x 1350w x 800d Yes 50mm PN16 flange
G100 128 m 3 /h Skid Unit (LP) 2500h x 1800w x 800d Yes 100mm PN16
Skid Unit (MP) 2000h x 1350w x 800d Yes flange
(1,350 kWh)
G160 200 m 3 /h Skid Unit (LP) 2500h x 1800w x 800d Yes 100mm PN16
Skid Unit (MP) 2000h x 1350w x 800d Yes flange
(2,100 kWh)
G250* 320 m 3 /h Skid Unit (LP) 2500h x 1800w x 800d Yes 100mm PN16
Skid Unit (MP) 2500h x 1800w x 800d Yes flange
(3,400kWh)
Yes
G400* 520 m 3 /h Skid Unit (LP) 2500h x 3000w x 3000d Yes 100mm PN16
Skid Unit (MP)
flange
(5,500 kWh)
G650* 800 m 3 /h Skid Unit (MP) 2500h x 3500w x 3000d Yes 150mm PN16
(8,500 kWh) flange
SP1* 1,920 m 3 /h Skid Unit (MP) 2500h x 3500w x 3500d Yes 150mm PN16
(21,000 kWh) flange
SP2* 3,200 m 3 /h Skid Unit (MP) 2500h x 5000w x 4000d Yes 150mm PN16
(34,000 kWh) flange
Table 4: Full range of meters indicating Type, Maximum Flow
Rate, Minimum Compartment Sizes and Outlet Supply fitting
required.
Notes:
Final specification of meters by Bord Gáis Networks
Gas Main, services and meters transporting gas at
pressures greater than 100 mbar are not permitted
within the building line of occupied premises
Under no circumstances is PE piping permitted inside
the building
All flange pipe connections should include a gasket
* Meter Bypass Available, subject to evaluation. Refer
to terminology for further details.
Refer to pages 17 to 20 for further details. Green text
indicates low pressure and blue text indicates medium
pressure.
16

0n-site fabricated meter assemblies
(pressure reduction & metering):
The Surface Mounted Meter Box:
Facilitates a G4 (LP/MP) meter
Figure 12: The Surface-Mounted Meter Box
The Recessed Meter Box:
Facilitates a G4 (LP/MP), G16 (LP/MP) meter
Figure 13: The Recessed Meter Box
The Six Meter Cabinet:
Cabinet Dimensions: 1160h x 750w x 300d
Note: The meter box should not be punctured
when recessed into cavity walls or voids.
The Steel Meter Manifold:
Facilitates G4’s (LP/MP), G10’s (LP/MP) or connection
of Meter Modules (see page 16 for dimensions)
Outlet Pipework
Isolation valve placed in an
accessible position.
Figure 14: The Six-Meter Cabinet.
Further information on the G4 meter, meter cabinet and manifold options refer to in Booklet 1, pages 5 – 12 and
Booklet 3, pages 3 – 8.
Both the Steel Meter Manifold and Six Meter Cabinet are manufactured off-site to facilitate multiple meter
connections.
Each of the above installation options should be placed a minimum of 300 mm above finished ground level.
17
Figure 15: The Meter Manifold within Purpose-Built
Compartment

Pre-fabricated meter modules (pressure
reduction & metering):
Meter modules are surface mounted and arrive on site
assembled and pre-locked.
When delivered they require a gas service connection
carried out by Bord Gáis Networks or a Bord Gáis
Networks nominated contractor. The supply pipework
connection is carried out by the client’s nominated gas
installer.
Only after these connections are complete can the
module be unlocked and the meter commissioned. The
clients nominated gas installer should be on-site for
co-ordination of commissioning and verification of the
Declaration of Conformance 10 .
Typical Applications:
Small to medium sized commercial customers (note
maximum kWh and maximum flow rates below).
Figure 16: A G25 Meter Module connecting a
complex of offices in Naas, Co. Kildare
Meter Module Specifications
Modules Outer dimensions Maximum flow rate Supply outlet
of module (mm) (m 3 /h)/gas load (kWh) fittings
G10 (LP) 520h x 700w x 210d 16 m 3 /h / 166 kWh 1.5” BSTP
G10 (MP) 520h x 700w x 210d 16 m 3 /h / 166 kWh 1.5” BSTP
G16 (LP) 580h x 700w x 230d 20 m 3 /h / 210 kWh 1.5” BSTP
G16 (MP) 400h x 300w x 200d 20 m 3 /h / 210 kWh 1.5” BSTP
G25 (LP) 520h x 532w x 230d 32 m 3 /h / 340 kWh 1.5” BSTP
G25 (MP) 520h x 530w x 210d 32 m 3 /h / 340 kWh 1.5” BSTP
G40 (LP) 800h x 600w x 280d 52 m 3 /h / 550 kWh 2” BSTP
G40 (MP) 700h x 500w x 300d 52 m 3 /h / 550 kWh 2” BSTP
G65 (LP) 630h x 830w x 300d 80 m 3 /h / 840 kWh 2” BSTP
G65 (MP) 800h x 600w x 300d 80 m 3 /h / 840 kWh 2” BSTP
Table 5: Technical details for Meter Modules.
Low Pressure (LP) meter modules are connected to a
gas distribution network of less than 100mbar. The
standard module outlet pressure is set at 20mbar.
Meter Module Positions
Medium pressure (MP) meter modules are connected
to the gas distribution network of pressure greater
than 100mbar. Under no circumstances may the
medium pressure steel or polyethylene service,
including meter module, be positioned within the
building line 12 of occupied premises. Each meter
module should be placed a minimum of 500mm
above finished ground level.
10
Refer to Section 7: Certification of Non-
Domestic Gas Installations.
11
, 12 Refer to Section 8: Appendix – Terminology.
18

Skid units (pressure reduction & metering):
Figure 17 & Figure 18: A SP1 meter connecting a
pharmaceutical plant in Athlone, Co Westmeath and a G65
unit placed in a naturally ventilated basement 14 connecting a
hotel in Sandyford, Co. Dublin.
Skid units are delivered to site assembled and prelocked.
They are positioned and supported on a
concrete base provided by the client / builder (refer
to page 21 for further details). When delivered they
require a gas service connection organised by Bord
Gáis Networks or a Bord Gáis Networks nominated
contractor, and a supply pipework connection carried
out by the client’s nominated gas installer.
Only after these connections are complete and
appropriate protection provided can the skid unit be
unlocked, the meter fitted and the completed
installation commissioned. The clients nominated
gas installer should be on-site for coordination of
commissioning and verification of the Declaration of
Conformance 13 .
Typical Applications:
Large commercial premises and industrial processing
loads (note maximum kWh and maximum flow rates
below).
Skid Unit Specifications:
Meter Space Maximum flow rate Supply outlet
Required (m 3 /h) / maximum fittings
Gas load (kWh)
G40 (LP) 2000h x 1350w x 800d 52 m 3 /h / 550 kWh 2” BSTP
G40 (MP) 2000h x 1350w x 800d 52 m 3 /h / 550 kWh 2” BSTP
G65 (LP) 2000h x 1350w x 800d 80 m 3 /h / 840 kWh 2” BSTP
G65 (MP) 2000h x 1350w x 800d 80 m 3 /h / 840 kWh 2” BSTP
G100 (LP) 2500h x 1800w x 800d 128 m 3 /h / 1,350 kWh 100mm PN 16 flange
G100 (MP) 2000h x 1350w x 800d 128 m 3 /h / 1,350 kWh 100mm PN 16 flange
G160 (LP) 2500h x 1800w x 800d 200 m 3 /h / 2,100 kWh 100mm PN 16 flange
G160 (MP) 2000h x 1350w x 800d 200 m 3 /h / 2,100 kWh 100mm PN 16 flange
G250 (LP)* 2500h x 1800w x 800d 320 m 3 /h / 3,400 kWh 100mm PN 16 flange
G250 (MP)* 2500h x 1800w x 800d 320 m 3 /h / 3,400 kWh 100mm PN 16 flange
G400 (MP)* 2500h x 3260w x 2240d 520 m 3 /h / 5,500 kWh 100mm PN 16 flange
G650 (MP)* 2500h x 4400w x 2500d 800 m 3 /h / 8,500 kWh 150mm PN 16 flange
SP 1 (MP)* 2500h x 4000w x 3050d 1,920 m 3 /h / 21,000 kWh 150mm PN 16 flange
SP 2 (MP)* 2500h x 4800w x 3150d 3,200 m 3 /h / 34,000 kWh 150mm PN 16 flange
* Meter Bypass Available 15 , subject to Bord Gáis Networks evaluation.
Table 6: Technical details for Skid Units
19

Low Pressure (LP) skid units are connected to the gas
distribution network of pressure less than 100mbar.
The standard outlet pressure is set at 20mbar.
Medium pressure (MP) skid units are connected to
the gas distribution network of pressure greater than
100mbar. Under no circumstances may a medium
pressure steel or polyethylene service, with meter,
be positioned within the building line of occupied
premises.
Protection in the form of a palisade fence or cage
is included into the connection cost by Bord Gáis
Networks (Refer to page 24 for further details). The
customer may provide the required protection only
if the design has been pre-agreed with Bord Gáis
Networks. Note: The Meter will remain locked until
protection has been installed.
Electronic Daily Metering is necessary on all
connections with an estimated annual consumption
(EAC) 16 greater that 5.55GWh (5,550,000 kWh).
Electronic Daily Metering may be provided on skid
units of lesser EAC’s after request from the client and
evaluation by Bord Gáis Networks.
If a twin stream skid is specified, the customer / builder
is recommended to request specific compartment and
concrete base details from Bord Gáis Networks.
13
Refer to Section 7: Certification of
Non-Domestic Gas Installations.
14
Refer to Section 5, page 28:
Meters located in Open Basement Areas.
15
, 16 Refer to Section 8: Appendix – Terminology.
Building Energy Management Systems (BEMS) are
computer systems which enable the system operator
to monitor and control building services including
heating, air conditioning and lighting. BEMS are also
capable of automatically recording gas and electricity
consumption via the relevant meters and the data
obtained can be used, for example, to analyse energy
usage trends and to record and forecast annual energy
consumptions.
Through on-line monitoring of energy usage,
customers can identify and report on energy
consumption data which will help to identify costsaving
opportunities and promote energy conservation
between occupants and building managers.
Bord Gáis Networks is committed to promoting energy
efficiency and if requested we can provide a Low
Frequency (LF) Pulse Output from a Bord Gáis Networks
meter. This device enables the BEMS to record the
throughput of gas through the gas meter.
20

Base requirements for skid units:
C
B
A
E
D
C
C
D
E
C
Figure 19: Concrete Base Detail
SKID
DIMENSIONS
A B C D E
G40 LP 1,800 1,650 750 775 150
G40 to G65 (MP) 1,800 1,650 750 790 150
G65 (LP) 1,800 1,650 725 715 200
G100 (MP) to G160 (MP) 1,800 1,650 725 700 200
G100 to G160 (LP) 2,300 1,650 675 550 300
G250 (LP) 2,300 1,650 675 560 300
G250 (MP) 2,300 1,650 725 480 200
G400 (MP) Axial Flow 5,000 3,000 1,400 1200 200
G400 (MP) Direct Acting 5,000 3,000 1,400 1200 200
G650 (MP) Axial Flow 5,000 3,000 1,350 1,225 300
G650 (MP) Direct Acting 5,000 3,000 1,350 1,175 300
SP1 (MP) Axial Flow 4,000 3,500 1,600 1,200 300
SP1 (MP) Direct Acting 5,000 3,500 1,600 1,350 300
SP2 (MP) Axial Flow 5,500 4,000 1,850 1,300 300
SP2 (MP) Direct Acting 5,500 4,000 1,850 1,200 300
Table 7: Dimensions for sizing the concrete Base
All skid units require a base consisting of concrete (150mm thick) placed on a consolidated
hardcore (150mm thick). The builder/customer is responsible for placing the base in the position
as agreed with Bord Gáis Networks.
If a twin stream skid is specified, request specific compartment and concrete base details from
Bord Gáis Networks.
Dimensions may change subject to site specific requirements and should be confirmed with Bord
Gais Networks at time of construction.
21

Guidelines for positioning pressure reduction
and metering installations:
• Bord Gáis Networks provide and lay all gas
mains and service pipework up to and including
the point of delivery (normally including the
meter).
• Full access should be provided to the installation
for Bord Gáis Networks authorised personnel at
all times to facilitate construction of the meter
installation and subsequent maintenance.
• Service pipework provided by Bord Gáis
Networks for meters or pressure reduction
equipment should be positioned prior to
pouring of floor slab.
• The meter and/or pressure reduction equipment
should be within the confines of the customer’s/
developer’s property and as close as practicable
to the premise being supplied.
• All meter installations should be located in a welldrained
area that is not liable to flooding. Design
and/or location should protect the meter and its
connections against the possibility of corrosion.
The meter installation should not be located
directly beneath a ventilation grill or in a position
liable to allow ingress of water unless weather
protected.
• All meters and associated supply pipework should
be earth bonded by the customer’s nominated
electrical contractor in accordance with the current
edition of the ETCI Regulations.
• Meters should always be positioned in an area of
natural ventilation.
17
Refer to Section 8: Appendix - Terminology
• Care should be taken when locating the external
isolation valve so it is freely accessible at all
times, e.g. not in a parking area where vehicles
may restrict access (Note page 12).
• Planning permission should be obtained by
the customer where necessary, i.e. for external
structures designed to conceal or protect district
regulator installations (DRI’s) 17 and gas meters.
• Above ground gas services should only pass
through naturally ventilated areas that are
publicly accessible (i.e. providing access for Bord
Gáis Networks maintenance at all times).
• Gas meter and ancillaries may not be placed in
a space which may hinder escape in the event
of an emergency.
• Meters should not be located where they may
be exposed to accidental damage. Adequate
protection should be provided by the customer/
builder against possible equipment damage
or tamper. Installations in close proximity to a
traffic area should be fitted with a suitable crash
barrier.
• Underground natural gas pipework should be a
minimum of 300mm from electrical mains. Gas
equipment should not be positioned beneath
overhead electrical cables or trees (applicable to
skid units only, note pages 19 and 20).
22

Meters should not be located:
• adjacent to medium voltage (MV) electricity
substations (minimum direct communicating
distance of 10 metres required)
• in an area adjacent to L.P.G., or a flammable
material storage area where paper, timber or
chemicals are stored
• in an area adjacent to ventilation ducting or an
air conditioning intake system
• where they may be exposed to extreme
temperatures or ignition sources (e.g. switch
gear, operating plant or where any spark
producing equipment are within close proximity).
Electrical current carrying equipment or cables
should not be in contact with or suspended from
gas services, plant or meters
• in a position open to a stairway or protected
shafts, lobbies or corridors, unless contained
within a suitable compartment (per page 27)
• beneath a stairs, unless placed within a minimum
two hour fire resistant and sealed compartment
ventilated directly to atmosphere (refer to
information regarding compartments on pages
25, 26 & 27).
Protection of meter and pressure regulator installations:
Requirements:
The structural containment for externally located
meters may be either in the form of a prefabricated
factory made compartment or module
provided by Bord Gáis Networks (note pages
17 and 18), or purpose-built compartments
constructed by the builder / customer (refer to page
16 for minimum dimensions).
If meters are to be positioned nearby passing traffic,
a protective barrier should be placed around the
installation. A suitably robust crash barrier should be
constructed by the builder/customer and positioned
so as to prevent any accidental damage to the gas
installation.
In the case of a steel manifold or skid unit,
protection from tamper and possible impact should
be provided with palisade fencing caging, or
equivalent (note pages 24 to 27). The emergency
underground isolation valve, on the gas service,
should remain accessible at all times (Note page
12).
The enclosure should provide adequate protection
against weather and the possibility of tamper.
Materials selected for construction of the enclosure
should be weather resistant and durable.
Other utilities, materials or refuse, may not be
placed within the same enclosure or be located
within proximity to pose a safety risk.
23

Steel cage protection (generally provided by bord gáis networks):
Figure 20: G160 MP skid unit with protection connecting a
hotel in Bettystown, Co. Meath.
C
F
U
D
E
A
S
T
S
B
Figure 21: Diagram of Caged Protection
Meters
Types and A B C D E F S T U
Pressure
G40 (LP)
G40 (MP)
G65 (LP) 2000 1350 1500 1900 1000 750 450 1800 700
G65 (MP)
G100 (MP)
G160 (MP)
G100 (LP)
G160 (LP) 2000 1350 2000 1900 1000 750 450 1800 850
G250 (LP)
G250 (MP)
Table 8: Dimensions of caged protection for each meter arrangement.
24

Purpose-built meter compartments (constructed
by customer / builder):
• Separation between the exits of each ventilating
duct to atmosphere should be a minimum of
450mm. The high level duct should provide air,
direct from atmosphere, to the extreme top of
the compartment and the low level duct should
be positioned a maximum of 150mm from the
floor of the compartment.
• All voids within and around the compartment
should be fully sealed and fire proofed to prevent
the ingress of air or gas to a cavity or void in a
building.
• Any walls should be of cavity free construction
and the compartment should not include
windows.
• All pipe exits from the compartment should be
sealed with an approved fire sealing material
per I.S. 820, I.S. 813 and building regulations
(TGD’s), refer to page 41 for sleeving detail and
requirements.
Figure 22: G65 MP module with protection (provided by
builder) for a warehouse facility in Arklow, Co Wicklow.
To conceal gas meter and pressure regulator
equipment, the client, builder or architect may opt to
build a purposely constructed compartment.
Bord Gáis Networks’ requirements for this
compartment are as follows:
• If the compartment should contain electrical
light fittings, they should be of approved sealed
and spark proof specification. Standard electrical
switch fittings and spark producing equipment
are not permitted inside the compartment or
within a proximity that may pose a safety risk.
If it is proposed that meters be located in a
compartment within a basement area, Bord Gáis
Networks should be consulted for ventilation
requirements and construction details on
1850 427 737.
• Ventilation to atmosphere should be provided
through a full height louvered door or suitably
sized and constructed vents / ventilation ducts.
High and low ventilation to the compartment
should provide 5,000mm 2 minimum free area each
or 1% of compartment floor area each, which ever
is greater.
• Ventilation ducts should be protected and
constructed to resist potential fire damage.
25

Plan Detail:
Pipes should have
supporting brackets
400mm
min.
For Outlet Pipe Requirements see “Sleeving’
on page 41.
The dimensions of the compartment for available
meter arrangements are available on page 12
of booklet 1 (for multiple G4 meters providing
maximum flow rate up to 6m 3 /h each) and page 16
of this booklet, for each meter type.
Figure 23: Plan view of gas meter compartment
Inside Meter Compartment Detail:
Block Construction
Steel Gas
Service
Ground
Level
sealed compartment
300mm
min.
150mm Floor Slab
600mm minimum cover required
Figure 24: Elevation view of gas meter compartment
Locking devices and access
Figure 25: Locked
caged protection.
Bord Gáis Networks supply and fit locks on the doors
of compartments for district regulator installations
DRI’s (Phone Network Maintenance at 1850 200 694).
For access to meter compounds, the customer builder
install locks that require an 8mm triangular key to lock
and unlock. In doing so, both Bord Gáis Networks and
the customer will have access to the meter.
Where locks are used to secure meter compartments,
Bord Gáis Networks should be provided with keys and
access to effectively respond to customer requests and
possible emergency call-outs.
Figure 26: Lock
provided by Bord Gáis
Networks for DRI’s and
customer sourced 8mm
triangular key locks for
meter compounds.
26

Locating meters inside the building:
Ducts are required to provide
ventilation to the meter compartment.
Ventilation ducts should be sleeved
through cavities, suitably fire rated
and provide minimum air openings as
detailed below.
Natural Gas Meter(s)
Area Isolation Valve
The enclosure, including access
doors, should meet the structural
and fire retardant requirements
set out in the Irish building
regulations.
Enclosure provided by
builder / customer.
From
Mains
External Isolation
Valve (Refer to
page 12).
Gas PE Service
Steel Gas Service
At early construction stage provide suitable
sleeve for Steel Service Pipe entry. (Service
pipe and metering equipment provided by
Bord Gáis Networks)
Note:
Polyethylene pipework is not
permitted inside the building.
Figure 27: Compartment details for meters placed inside
the building.
Only in situations where delivered natural gas mains
pressure is less than 100mbar and it is not possible
to locate meters externally, may meters be placed
within the building line.
In addition to the minimum requirements set out in
the previous pages, the following Bord Gáis
Networks specifications should be adhered to when
placing meters inside the building.
• If recessed into the structure of the building or
placed within the building, meters should be
placed in a completely sealed compartment with
the exception of access and ventilation provided
by louvered doors or ventilation ducts provided
direct to atmosphere.
• Meters should be positioned as near as
practicable to the external wall where the gas
service enters.
• Provision should be made for a steel service to
enter into the building through a suitably robust
and air-tight sleeve where traversing a cavity or
void.
• On entry into the building, the gas service should
only pass through a ventilated area that is publicly
accessible (i.e. providing access for Bord Gáis
maintenance at all times). The gas service may not
pass through a protected corridor, stairway, shaft,
refuse area or private premise (i.e. dwelling or
commercial unit).
• The enclosure, including access doors, should
meet the structural and fire resistant requirements
applicable to that part of the building. Solid access
doors to the compartment should be self-closing
and non-lockable.
27

Meters located in the open basement areas:
Meters located in an underground car park or open
basement area should only be positioned within a
naturally ventilated space. Mechanical ventilation
is never deemed acceptable if it serves the same
basement or space as the gas service or meters.
The meter installation should not be located directly
beneath a ventilation grill or in a position liable to
allow ingress of water, unless weather protected.
If it is required that the meters or gas service be
located in a dedicated room within the basement or
in a basement lacking natural ventilation, Bord Gáis
Networks should be consulted for specifications and
ventilation requirements.
Figure 28: G4 metres serving retail units in
Sandyford, Co. Dublin.
External Isolation
Valve (refer to
page 12)
600mm minimum
cover required
Area Isolation Valve
Basement
Ceiling
300mm
min
Natural Gas
Meter(s)
P.E. Service
At early construction stage,
provide suitable sleeve for
Steel Service Pipe (service pipe
and metering provided by
Bord Gáis Networks)
Naturally
Ventilated Area
1800mm
min
Figure 29: Illustration highlighting requirements when
placing meters in a naturally ventilated basement
28
Natural Gas Meter(s).

Section 6:
Customer pipework after the meter
Any person responsible for the design of gas pipework, construction of gas pipework, installation
of gas consuming equipment and/or commissioning of installation should be a competent
person.
Their responsibility commences from the Bord Gáis Networks point of delivery (normally the
meter) up to and including all installation supply pipework and gas consuming equipment.
Guidance contained within Section 6 of this document should only be referenced for installations
at maximum operating pressures less than or equal to 100mbar. For guidance on supply pipework
operating at maximum pressures greater than 100mbar refer to I.S.820. For industrial installations
or installations requiring a supply pressure exceeding 5 bar consult I.S./EN 15001-2.
When designing and constructing natural gas installations, the key considerations are:
A. Gas Supply Pipework:
Route of Pipework, Material Selection, Jointing, Isolation Points and Pipework Protection.
(Current edition of I.S.820 and Section 6 of this Guidance Document)
B. Gas Consuming Equipment:
B.1 Location (Permitted Locations) -
(The current edition of I.S.820, Manufacturer’s Instructions; I.S.813 - if domestic type
appliance)
B.2 Flue (Disposal of Products of Combustion) -
Route of Flue and Location of Flue Terminations,
(Current edition of I.S.820, Manufacturer’s Instructions; I.S.813 - if domestic type appliance)
B.3 Provision of Air (Permanent Air Supply for Gas Equipment) - Combustion Processes,
Cooling of Equipment and Air Provision for Occupants,
(Current edition of I.S.820, Manufacturer’s Instructions; I.S.813 - if domestic type appliance)
C. Commissioning of Gas Installation and Certification:
(Current edition of I.S.820 and Section 7 of this Guidance Document)
Gas Supply Pipework
Pipework Requirements (after the meter):
NOTE:
Pipework should be designed and
constructed to enable testing and purging
to be carried out.
Pipework should be installed so that it
does not impose excessive stress on devices
or components incorporated into the
pipework e.g. meters regulators, etc.
A single premise may be supplied with
natural gas with two or more meter points.
Installation pipework may only be supplied
from a single meter.
For commercial applications, pipework
downstream of the point of delivery
(normally after the Bord Gáis Networks
meter) should be designed to I.S.820
“Non-Domestic Gas Installations”.
The requirements for the installation of
domestic type appliances in non-domestic
buildings are set out in I.S. 813, “Domestic
Gas Installations”. The requirements for
pipework supplying these appliances is set
out in I.S. 820.
Both I.S.813 and I.S.820 contain section
J, which highlight gas installation
requirements for educational premises.
29

Premise
AHU
AHU
Gas
Service
Pressure
Reduction and
Metering
AHU
AHU
Kitchen
W
B
B
Plant Room
B - Boiler W - Water Heater AHU - Air Handling Unit
Local Gas Isolation. Refer to page 37.
Figure 30:
Typical Gas Network Layout for Industrial or Commercial Connection.
Figure 30 shows a typical installation where a
gas network connection is reduced in pressure
and metered close to the site boundary. Natural
gas is normally supplied to the customer at an
operating pressure of 20 mbar, unless otherwise
requested. Requests for pressure greater than
20mbar should be made at connection design
stage.
External Pipework (General)
• Pipework should be resistant to corrosion
and be electrically continuous (i.e. suitably
earthed).
• Pipework should not be located near high
voltage conductors, hot or chilled water
systems or subject to vibrations unless
appropriate measures are taken.
• Ferrous pipe should not be connected
directly to copper piping.
The position of pipework in relation to other
services should be such that it can function
properly and be used with safety.
External Pipework
Buried pipework
• All buried pipework should be
protected against corrosion (per page
38). Protective sheathing should
be checked for continuity before
installation.
• Mechanical joints may not be used on
buried metallic pipework.
Mechanical joints in accordance with I.S. EN
1555 may be used on buried PE pipework;
Pipework should be bedded in sand or fine
filling to a depth of 150mm above and
below the pipe. The minimum depth of cover
for the pipe is 375mm.
Pipework, which may be subject to vehicular
loading, should be protected in a robust
sleeve in addition to the minimum depth of
cover of 375mm.
30

Outer Wall
F.F.L.
Grout between sleeve
and concrete
DPC
Steel sleeve to
terminate 25mm
from FFL. Mastic
sealant to be
injected between
sleeve and service
pipe
Metallic Pipe
Sealant
Grout
Figure 31:
Below ground entry
into building.
When laying external pipework by using a mole
or by directional drilling, only polyethylene piping
should be used. This operation should be carried out
in accordance with I.S. 265.
For more information on the protection of
buried pipework, refer to page 38 of this
booklet and I.S. 820.
Particular attention needs to be given to the
design of pipework in areas known to be
susceptible to ground movement.
External Pipework
Above-ground pipework
External above-ground pipework should be:
• adequately supported (refer to page 40);
• protected against mechanical shock;
• minimum communicating distance of 10
metres from medium voltage electrical
substations
specific measures are taken (refer to
page 38).
• polyethylene pipework may not be
used above ground unless protected
against impact and protect against
the ultraviolet rays from the sun. PE
pipework should not be positioned
where it may be subjected to excessive
temperatures
• should be protected against the
possibility of lightning strikes where
appropriate
• positioned so to avoid spaces containing
garbage chutes, transformers, sewage pipes
and other sources of possible corrosion unless
31

GRP cover fixed
to wall
Capillary soldered
elbow
Compression
Fittings
Local Isolation Valve
PE transition coupling c/w wall
bracket
GRP sleeve bend
375mm
min
Figure 32:
Above ground entry into the building.
32mm PE
installation pipe
External riser
Individual premises can be supplied with installation
pipework constructed as external “risers” placed on
an outside wall. For aesthetic reasons such ‘risers’
can be hidden within a false rainwater down-pipe
or behind pre-fabricated expanded metal cladding
(See Fig. 33 below).
If placing installation pipework behind a false
PVC rainwater downpipe (backing removed), the
downpipe should be left open top and bottom and
secured to the wall.
Figure 33:
External gas riser behind cladding
The pipework within should be adequately
supported as per page 40.
Internal Pipework (General):
• Pipework should pass through walls or
floors by the shortest possible route (refer to
sleeving on page 41)
• The installation of gas pipework should not
impair characteristics of the building such
as fire resistance, mechanical stability, heat
retention and sound transmission.
• Pipework should be electrically continuous
and suitably earthed (refer to equipotential
bonding page 46).
• Gas pipework should not be routed in lift
shafts, stairways forming a protected shaft or
in protected escape routes / corridors (refer to
pages 33 and 34).
• Pipework should not be located near high
voltage conductors, hot or chilled water
systems or subject to vibrations unless
appropriate measures are taken.
• Gas pipework/equipment may not share
the same room, duct space or void as air
handling equipment or ducting.
• Polyethylene pipe should not be used within
the building
• Pipework should be supported as per
page 40.
The position of pipework in relation to other
services should be such that it can function
properly and be operated upon safely.
32

Internal Pipework:
Buried
All buried pipework should be protected against
corrosion and should not compromise radon
protection.
The minimum concrete cover for pipework in areas not
subject to vehicular loading is 25mm. Pipework, which
may be subject to vehicular loading, should adhere to
the same depth of cover, sand surround and protective
sleeve requirements as external buried pipework.
Mechanical joints may not be used on internal buried
pipework.
Any protective sheathing or coating should be checked
over its entire length for continuity before covering
takes place.
Note:
Gas Pipework in Protected Shafts:
A protected shaft, corridor or lobby may
not contain a pipe intended to carry
gaseous or liquid fuels. The protected
shaft should not contain a ventilating
duct (other than a duct provided for the
purposes of pressurising the stairway to
keep it smoke free).
Definition of a Protected Shaft:
A protected shaft is defined as a shaft
which enables persons, air or objects to
pass from one compartment to another
and is enclosed with fire resisting
construction.
For further clarification, consult The
Building Regulations, Section B.
Provision should be made, to allow adequate
expansion and contraction of buried gas pipes where
they are laid close to heating system pipework.
Joints may be made by welding, brazing or soldering
with capillary fittings (see Jointing page 39). Joints are
not permitted if in close proximity to heating system
pipework.
Internal Pipework:
Concealed pipework
Mechanical joints are not permitted on pipework if not
readily accessible for maintenance.
Pipes passing through external walls, cavity walls, solid
floors or solid ceilings should pass through a sleeve
(Refer to page 41 for further details).
Rising copper pipework behind plasterboard should be
suitably protected against the possibility of accidental
impact or puncture.
33

Pipework in stairways
• Pipework should not be located in protected
stairways or in protected corridors/lobbies.
• Pipes located in other internal stairways
of a building are subject to the following
requirements:
• the stairway should be constructed of noncombustible
materials;
• steel pipe with threaded or welded joints, or
brazed copper pipe may be used.
Pipework in lift shafts
Gas pipework is not permitted in lift shafts.
Service Shafts:
Gas pipework may be placed within a service shaft.
The construction of the service shaft should reflect
the fire prevention and structural requirements of
the building (refer to the current Technical Guidance
Documents - Building Regulations). The service shaft
should not affect the integrity of any fire barrier or
integrity of another protected shaft in the building.
The shaft should be constructed so to be impervious to
Internal Duct
gas/air throughout it’s length.
The continuous vertical shaft, as illustrated below,
should be supplied with adequate circulating air
directly from and to atmosphere at the extreme
bottom and top of the shaft. The minimum free
area of each opening should be 5,000mm 2
or 1/500 th the cross sectional area of the
shaft, which ever is greater. The service shaft
openings to atmosphere should not be near airconditioning
or ventilation system intakes.
Ducts providing air to or from atmosphere can be
routed horizontally to the base or to the top of the
vertical shaft. Ducts for this purpose should be of
the same fire rating as the service shaft. The air vents
should be located so as to ensure that air circulates
freely throughout the entire length of the service
shaft. The area of each opening should be the
same as the cross-sectional area of the service shaft
or, alternatively, fitted with mechanical ventilation
equipment or a gas isolation system which
incorporates a purpose-designed supervision system.
Where a vertical service shaft is divided horizontally
by fire-stops or other means, each section between
stops should be treated as a separate service shaft.
Detail 1
Third floor
apartment
Third floor
apartment
Second floor
apartment
First floor
apartment
Second floor
apartment
First floor
apartment
Fire sealed
at low level
Vent to outside
air (Fire rated
construction)
Ground floor
apartment
Ground floor
apartment
Detail 1
Basement Car-park
Car - Entrance
/ exit
Exit
Fig. 34
Installation Pipework in Internal continuous ventilated duct
34

GAS PIPEWORK AND OTHER SERVICES IN SERVICE SHAFTS
Hot Water and Permitted Gas pipework should be protected
Steam ≤ 10 bar
against corrosion.
Hot Water and
Steam > 10 bar
Not
Permitted
Ventilation and
air conditioning
ducts in service
shafts.
Permitted
Gas pipework should be enclosed in a purpose
constructed corrosion resistant sealed duct
or sleeve with ventilation at each end direct
to atmosphere. Before fitting the ventilation
openings and putting into operation, the duct/
sleeve should satisfy a pressure test to the normal
working pressure of the enclosed gas pipe. There
should never exist the possibility of air gas mixture
being circulated throughout the building.
Cold and Chilled Permitted Gas pipework should be protected against
Water
corrosion.
Electricity Permitted Adequate spacing and insulation should
be provided based upon the electrical
tension. Switch gear or spark producing
equipment is not permitted in the shared
space.
Telecommunication Permitted Adequate spacing should be provided.
Drainage Permitted Gas pipework should be protected against
corrosion.
Flammable Liquids Permitted The spacing and ventilation in the shaft
and Gases
should reflect the hazard rating of the
other gases/fluids.
Oxygen /
Compressed Air
Appliance Flues
Not
Permitted
Not
Permitted
Table 9: Gas pipework and other services in shaft.
Gas Appliance Flues should not be routed within or traverse service shafts.
Provision should be made for the contraction and expansion of the pipework within the service
shaft. Spacing between other services and gas pipework should be provided to allow access for
inspection and maintenance.
The pipework from the shaft can continue its path horizontally in an enclosure once it has exited
the continuous shaft, provided the lateral duct or sleeve is left open to the duct, but otherwise
sealed per figures on page 36. Always consult the Building Regulations (TGD’s), Section B.
35

Installation pipework (from external or internal service riser to
the natural gas consuming equipment/appliances)
Supply pipework may be routed horizontally from the
“service riser” to travel outside the building structure or
internally within the floor screed (note figures 35A and
35C below).
Pipework should not traverse a private premise to
supply another. Pipework placed in screed should have
a minimum cover of 25mm. Only soldered, brazed or
welded joints are permitted within the screed. Where
gas supply pipework is laid close to heating system
pipework, provision should be made for expansion and
contraction of buried pipework.
Pipework exposed to concrete should be protected
against its corrosive affects with protective wrap or
PVC coating. Pipework may travel at high level, note
requirements set out in 35B and 35D below.
Entry from Outside Air or
Internal Continuous Duct
Local Isolation Valve
(see page 37)
Sleeve
Entry from Outside Air or
Internal Continuous Duct
Screed
(minimum
cover of
25mm)
Ceiling
Fire
Resistant
Mastic
Sleeve
Fire Resistant
Mastic
PVC coated
or wrapped
pipework
35A
Local
Isolation
Valve (See
page 37)
35B
Entry from Outside Air or
Internal Continuous Duct
Screed (minimum cover of 25mm)
Premise
Corridor / Common Area
Fire resistant sleeve and mastic
Continuous PVC coated or
wrapped pipework
Local
Isolation
Valve
(see page
37)
35C
Entry from Outside Air or
Internal Continuous Duct
Gas Pipework
Fire Rated Sleeve
Fire Resistant
Mastic
Ceiling
g
Ceiling Void
Corridor / Common Area
Specification of Plasterboard dictated by
Building Regulations (TGD’s), Section B
for alternative options, consult Page 40 - “Pipes in Voids”
Premise
Local
Isolation
Valve (See
page 37)
35D
Figure 35:
Permitted routes of gas pipework from service shaft atmosphere to premise.
36

Means of isolation
Isolation Valves (Note Figure 36):
To control gas flow it is necessary to install gas isolation
valves at different points in the pipework installation:
• at the primary meter
(24 hour access required),
• on gas pipework before entering the building (24
hour access required),
• at all gas consuming equipment/appliances,
(Operator access required)
• for gas installation purge points when
commissioning in phases,
• for future site maintenance and / or site
extension.
The isolation valve on the primary meter and on gas
pipework before entering the building should be
clearly and permanently marked stating its purpose
and indicating its “on-off” position. These isolation
points should be accessible to Bord Gáis Networks, the
emergency services and the building owner/operator at
all times. The isolation valve/device should be protected
against possible tamper and impact.
Appliance connections
Appliances may be connected to gas pipework by rigid
or flexible connectors as appropriate. An appliance
isolation valve marked stating its purpose and
indicating it’s “on-off” position is required.
Pipework design should be such that air, or gases
such as oxygen, when used in conjunction with the
combustible gas cannot enter the pipework. This may
require the use of a protection system to prevent
reverse flow.
Flexible appliance connectors should have permanently
fitted end fittings and should be constructed to a
recognised standard appropriate to their application.
All gas valves should conform to I.S. EN 331. Taper
plug valves may not be used on installation pipework
unless it exists as an integral part of an appliance.
The above does not apply to flexible connectors
adopted for low gas rate appliances in laboratories or
educational establishments, e.g. bunsen burners. See
annex J, I.S. 813 or I.S. 820.
For requirements relating to flexible connectors for
domestic type appliances, refer to I.S. 813.
Pipework should be supported so that normal
operation of the isolation valve does not lead to
excessive stresses in the pipework.
Figure 36:
Gas Isolation Valve.
37

Material Selection:
Materials should meet the requirements of the
appropriate European Standard, or where that
does not exist, materials should conform to another
internationally recognised standard. Materials should
withstand high temperatures or be coated with a
protective material capable of withstanding high
temperatures for a given period of time.
The selection of materials, fittings and jointing
methods should be appropriate for:
• the pipework design pressure
• the location of the pipework
• the operating temperature under normal
operating conditions, and
• any potential corrosive environment
• the anticipated lifespan of the pipework
Under specialist or processing load applications,
consideration should be given to hydrogen sulphide,
sulphur content, water content, dust content and
the water/hydrocarbon dew point of natural gas. The
above may require adapted materials, drainage of low
points and filtration.
Corrosion protection
Metallic pipework should, where necessary, be
protected against corrosion.
Corrosion protection may consist of suitable wrapping,
coating, sheathing or equipping with cathodic
protection, chosen and applied in accordance with
manufacturer’s recommendations.
Metallic pipework should be coated or electrically
insulated at points of contact with other metallic
components. This can be satisfied by adopting one of
the following:
i) by using non-ferrous materials,
ii)
a suitable coating,
iii) galvanised pipes with
galvanised fittings, or
iv) wrapped pipe, with all joints suitably wrapped.
Buried pipework should be adequately protected
against corrosion by being plastic coated or suitably
wrapped throughout its entire length.
For additional information regarding sulphidation (i.e.
a black deposit resultant from the reaction between
copper and natural gas) contact Bord Gáis Technical
Department at 1850 200 694.
Fiscal meters, meter by-passes, electronic daily
metering equipment and regulators should be chosen
in agreement with Bord Gáis Networks.
Materials containing asbestos should not be used.
Note:
Polyethylene pipework is not permitted inside the
building.
38

Jointing:
The number of joints in the pipework should be kept
to a minimum. Ferrous pipe should not be connected
directly to copper piping (as galvanic effect will result
in corrosion).
Where necessary, provision should be made for the
contraction and expansion of the pipework.
Welded, Brazed and Soldered Joints:
Persons carrying out welding or brazing should have
successfully completed specialist training.
Solder used in capillary fittings for jointing pipework at
an operating pressure not exceeding 150 mbar should
have a melting point not less than 210 °C. Solder
used in capillary fittings for jointing pipework at an
operating pressure at or exceeding 150 mbar should
have a melting point not less than 450 °C. Joints of
this type should be performed in accordance with
requirements of I.S. EN 1775.
Mechanical Joints Threaded:
Threaded joints should conform to prEN 10226-1 and
not be used on pipes exceeding DN 50. For DN 50 a
pipe threading machine should be used and the thread
be tapered to BS 21 or equivalent.
Sealants should conform to I.S. EN 751. Sealants
should not be used for pipework that may be subjected
to temperatures outside the effective range specified by
the sealant manufacturer. Sealants may be applied only
to threaded pipe joints in accordance with procedures
specified by the sealant manufacturer. Hemp may only
be used in combination with a suitable sealant. PTFE
tape used as a sealant on screwed threads should
conform to one of the following:
• BS 7786 (For regular threads);
• I.S. EN 751-3 (For coarse threads).
Mechanical Joints:
Only natural gas approved jointing compounds may be
used at the gas train or on any other threaded joints
(e.g. permanite heavy duty gas tape – single wrap).
• Mechanical joints should be resistant to tension
and conform to I.S. EN 1555-3 and I.S. EN
10226-1/2.
• Mechanical joints should be located in ventilated
and accessible spaces, unless specifically designed
PE pipe fittings suitable for external below ground
applications.
• Mechanical joints should comply with an
appropriate recognised standard, i.e. 1555-3 (for
PE fittings), and I.S. EN 10226-1/2 (for threaded
joints).
• Press fittings are permitted once installed
per IS 820
39

Pipework support:
Pipework can be subject to movement from thermal
expansion, thermal contraction, structural
movement of the building, vibration and rotation or
torsion.
Pipework support should allow for pipe movement
without damage being caused to corrosion protection
or pipework installation.
When supporting pipework on a horizontal or nearhorizontal
surface, the support brackets should
ensure that the pipework remains clear of the surface.
The support brackets and screws should be of
corrosion resistant materials.
Ferrous materials e.g. screws and support brackets
should not be in contact with copper piping.
Pipes in Voids:
Where pipes are to be located in voids, any one of the
following should be applied:
• Air vents terminating in open air should be
provided. Openings should be a minimum of
500mm 2 for every square metre of void surface
area, or
• The pipe section is welded or continuous
throughout its length within the void, or
• The pipe should be contained within a vented,
continuous sleeve (as per figure 35D), or
• The void is filled with an inert material. If this
material is cement bonded, the pipe should
be protected against corrosion (See Corrosion
Protection page 38)
Table of Recommended Support Spacing:
Diameter for steel Screwed Steel (m) Welded Steel (m) Copper (m)
(and copper) in mm (support spacings) (support spacings) (support spacings)
15 (15) 2 2.5 1.2
20 (22) 2.5 2.5 1.8
25 (28) 2.5 3 1.8
32 (35) 2.7 3 2.5
40 (42) 3 3.5 2.5
50 3 4
65 4.5
80 5.5
100 6
150 7
200 8.5
250 9
Table 10:
Support Spacing for pipework
40

Sleeving:
Entry through walls or floors
Where pipework passes through walls or floors, it
should travel the shortest route. The sleeve should
be joint free, sufficiently robust to resist compression
and possible building settlement, and should have a
minimum of 6mm or 1/4’’ of clearance around the
gas pipe. Pipework traversing wall cavities should be
located within a sleeve resistant to corrosion.
Gas pipework including sleeves should be installed so
to not significantly impair the characteristics of the
building, e.g. mechanical stability, fire resistance, heat
retention and sound transmission.
Sleeves should be sealed to the structure of the
building, at one or both ends of the annular space
between the sleeve and the pipe. Sealants which
remain flexible when set and impermeable to gas
should only be used.
Where temperature change and anticipated building
movements may lead to significant stresses on
pipework adequate provisions should be allowed for
movement of the pipework. (Refer to Pipe Support
page 40).
Cavity
Pipe Support
Sleeve
Grout
90 0 bend
Temperature resistant mastic
between pipe and sleeve. The joint
between the elbow and pipework
should remain uncovered and
accessible.
Figure 37:
Pipe sleeve through cavity or void.
Pipe
Temperature resistant mastic
Sleeve
Floor finish
25 mm
Figure 38:
Pipe sleeve in concrete floor or ceiling.
Temperature resistant mastic between
pipe and sleeve
41

Pipe Sizing:
Pipework should be sized so that the pressure at the
appliance input is safe and compatible with optimum
operation per the manufacturer’s instructions.
To calculate the necessary pipe size, take note of
the gas demand in kW at each appliance. Note it is
important to use the appliance kW input figure. The
following capacity tables give the Maximum Capacity
of different length pipes in m 3 (1m 3 = 10.35kWh). In
complex installations it is prudent to add ‘equivalent’
length to compensate for fittings.
Pressure considerations:
Note:
Where the customer operating pressure is greater
than 20mbar (for purposes of supplying a plant
room), then this pressure may need to be reduce
locally using a regulator before entering a public or
staff work area. On occasion, the application to be
supplied at 20mbar may need a different meter.
Where high gas velocities exist, consideration needs
to be given to the effectiveness of gas filtration, the
effects of erosion, the choice of erosion resistant
materials and to prevention against noise transmission.
Supply pipework between the meter and large
gas consuming equipment should be sized and be
of sufficient length to allow for sudden pressure
fluctuations during equipment start-up and shutdown.
Refer to Safety Devices page 45.
The operation of appliances, such as compressor
units, should not adversely affect the safe operation
of pipework and regulators or the accuracy of the
metering system.
Account should be taken of the expected maximum
flow rate together with any foreseeable increase in the
load, and valves and pipes sized accordingly.
Regulators and secondary meters should be suitable for
the range of flow rates and pressures that will occur
during operation.
The incorporation of a pressure gauge located beyond
the mid point of the installation can serve as a monitor
for maintenance and guidance for future plant
extension.
Under normal conditions all downstream installation
pipework, fittings and auxiliaries of the meter should
be designed so to operate at the pressure supplied and
be able to withstand elevated test pressures.
42

Conversion from alternate fuels:
Note: Remember that natural gas pipework sizes will always be larger than L.P.G.
pipework sizes for connection to similar equipment.
• Assessment for suitability of existing equipment and pipework installation is
necessary before commencing a conversion programme.
CONVERSION FACTORS
10 kWh = 34,130 BTU
10 kWh = 36 Mega Joules
10 kWh = 34.13 Cubic Feet of Natural Gas
10 kWh = 0.966 Cubic Meters of Natural Gas
10 kWh = 0.94 Litres of Gas Oil
10 kWh = 1.41 Litres of LPG
1 bar = 14.5 psi
1 bar = 100 kPa
43

CONVERSION TABLE
The number of joints in the pipework should be kept to a minimum.
Table 11:
Discharge in a
straight horizontal
copper pipe with
1 mbar differential
pressure between
each end.
1m 3 = 10.35kWh
1kWh = 0.0966m 3
Length of 3 6 9 12 15 20 25 30 40 50
Pipe (m)
Size of Pipe Discharge (m 3 /h)
6mm 0.12 0.06
8mm 0.52 0.26 0.17 0.13 0.1 0.07 0.06 0.05
12mm 1.5 1 0.85 0.82 0.68 0.52 0.41 0.34 0.26 0.2
15mm 2.9 1.9 1.5 1.3 1.1 0.95 0.92 0.88 0.66 0.52
22mm 8.7 5.8 4.6 3.9 3.4 2.9 2.5 2.3 1.9 1.7
28mm 18 12 9.4 8 7 5.9 5.2 4.7 3.9 3.5
35mm 32 22 17 15 13 11 9.5 8.5 7.2 6.3
42mm 54 37 29 25 22 18 16 15 12 11
54mm 110 75 60 51 45 38 33 30 26 23
76.1mm 280 190 150 130 120 98 86 78 66 58
108mm 750 510 410 350 310 260 230 210 180 160
Table 12:
Discharge
in a straight
horizontal steel
tube with 1
mbar differential
pressure between
each end
Length of 3 6 9 12 15 20 25 30 40 50
Tube (m)
Normal Size Discharge (m 3 /h)
6mm 0.29 0.14 0.09 0.07 0.05
8mm 0.8 0.53 0.49 0.36 0.29 0.22 0.17 0.14 0.11 0.08
10mm 2.1 1.4 1.1 0.93 0.81 0.7 0.69 0.57 0.43 0.34
15mm 4.3 2.9 2.3 2 1.7 1.5 1.4 1.3 1.2 1
20mm 9.7 6.6 5.3 4.5 3.9 3.3 2.9 2.6 2.2 1.9
25mm 18 12 10 8.5 7.5 6.3 5.6 5 4.3 3.7
32mm 39 27 21 18 16 14 12 11 9.2 8.1
40mm 59 40 32 27 24 21 18 16 14 12
50mm 110 76 61 52 46 39 34 31 26 23
65mm 220 150 120 100 92 79 70 63 54 47
80mm 340 230 190 160 140 120 110 97 83 73
100mm 690 470 380 330 290 250 220 200 170 150
Table 13:
The effects
of elbows,
tees or bends
incorporated
in a pipework
installation
(expressed as
the approximate
additional
lengths to be
allowed).
Nominal Size
Approximate additional lengths to be allowed
Cast Iron Stainless Steel Elbows Tees 90 Bends
or Mild Steel or Copper
mm (in) mm (in) m (ft) m (ft) m (ft)
Up to 25 (1) Up to 28 (1) 0.5 (2) 0.5 (2) 0.3 (1)
32 to 40 (1 1 /4 to 1 1 /2) 35 to 42 (1 1 /4 to 1 1 /2) 1 (3) 1 (3) 0.3 (1)
50 (2) 54 (2) 1.5 (5) 1.5 (5) 0.5 (2)
80 (3) 76.1 (3) 2.5 (8) 2.5 (8) 1 (3)
Note:
The above tables refer to natural gas only.
For further details in relation to pipe sizing, please consult the CIBSE Guide Section C4
produced by the “Charted Institute of building Services Engineers”or the piping supplier.
44

Safety devices
The release of gas from a safety device should be
vented direct to atmosphere, to a safe location.
Safety devices may be incorporated within regulators.
A vent pipe may be fitted to a regulator or safety
device to transmit gas released due to over-pressure,
away from the safety device position. The vent pipe
should be dimensioned so as not to impair the safe
operation of the safety device. The termination of vent
pipes should be protected against the ingress of rain or
other detritus.
Slam shut valves are best positioned as far as possible
from the customers primary regulator/governor, so
to prevent over pressure cut outs due to the sudden
closing of gas line or sudden demand fluctuations.
Large gas consuming installations connected to
the medium pressure (MP) network are particularly
susceptible.
When connected to the medium pressure network,
if the supply pipework pressure after the regulator is
less than 50mbar, the pipework volume between the
appliance/shut-off valve and regulator needs to be:
Regulator Capacity (m 3 ) ÷ 500
If the pressure after the regulator is greater than or
equal to 50mbar, then the pipework volume needs to
be: Regulator Capacity (m 3 ) ÷ 1000
Design for protection in case of fire
Pipework should be designed, constructed or protected
so that in the instance of exposure to fire, the
construction methods employed will avoid aggravation
of the fire.
This design principal may be achieved, by adopting a
combination of the following:
• isolating the pipework by means of a manual or
automatic means;
• the use of materials, components and fittings that
withstand high temperatures;
• location of all or part of the pipework in a service
shaft of appropriate fire resistance;
• coating pipework with a protective material
to enable the pipework to withstand high
temperatures for a given period of time.
Where the pipework is not readily accessible, attention
should be given to the mode of construction and
corrosion protection (Note: Materials Selection page
38, Jointing page 39, Pipes in Voids, page 40).
The Technical Guidance Documents (Building
Regulations), Section B must be adhered to.
For more accurate calculations consult the regulator
manufacturer for further details.
Gas detection equipment should be positioned per
manufacturers’ instructions.
Care should be exercised when commissioning gas
proving systems, to ensure the pipework protected is
sound prior to setting the proving device.
45

Identification of Pipework:
All gas pipework should be identifiable as
containing natural gas. This can be achieved
by colour coding the pipework bright yellow
(Yellow Ochre – 08 C 35) or by banding.
Pressure Labelling
Installations in excess of 20mbar require
labelling indicating the operating pressure of
the installation.
Banding
Banding can be achieved by applying ‘Yellow
Ochre’ adhesive wrapping, painting the
pipework ‘Yellow Ochre’ or applying colour
clips, at logical intervals, e.g. either side of
each valve and control, at points of entry
and exit through walls, where branching
occurs and other areas where recognition is
required.
Directional Flow
Where pipework is located in confined
spaces where the layout offers complex
installation, direction of flow should be
indicated.
Figure 39:
Pipework labelling detail.
Equipotential bonding
Metallic pipework should be electrically
continuous. Pipework other than
cathodically protected or electrically
isolated systems should be fitted with an
equipotential bonding system.
Reference should be made to current
electrical installation regulations (ETCI
regulations).
Marking of meters & supply
pipework
All supply pipework in a multiple meter
installation should be clearly marked to
indicate the premise number, floor number
and/or section of building being supplied.
(Labels available from Bord Gáis Networks at
1850 427 737).
The marking of pipework is essential for
correct meter recording, safe operation,
maintenance and accurate billing of gas
consumed.
Note:
Meters will not be fitted / commissioned if
the supply pipework is not connected to the
outlet pipework of meter modules or skid
units. Pipework should be labelled indicating
the premise or property it is to supply.
46

Certification of non-domestic
gas installations:
The non-domestic gas installations:
The authorised person responsible for the design
should complete the Declaration of Conformance
attesting that the installation has been designed in
accordance with the requirements of I.S.820 and in
accordance with the equipment and manufacturer’s
instructions.
Any person who designs or carries out work on a gas
installation should be a competent person.
2.) DESIGN: PLEASE COMPLETE IN BLOCK CAPITALS
NON-DOMESTIC PREMISES GAS INSTALLATION
DECLARATION OF CONFORMANCE
The gas installation at the above premise was designed under my control to supply the peak energy requirement (load requirement) at the
specified pressure (from the meter) at the point of delivery and meets with the requirements of clause 4 of I.S. 820.
Peak Energy Requirement (kW) (Please state total input load of all appliances in kW)
Supply Pressure (from meter) (mbar)
3.) CONSTRUCTION (Soundness Test for Pipework): 1.) GENERAL: PLEASE COMPLETE PLEASE IN COMPLETE BLOCK CAPITALS IN BLOCK CAPITALS
Complete Address: __________________________________________________________________________________
______________________________________________________
Customer Name: ______________________________________________________
Customer Tel: ______________________________________________________
Date of Test: ____/____/____ Time of Test: ________ Confirm Appliances NOT Connected:
GPRN: _______________
Diameter(s) of Tested Pipework: __________ Test Duration: ________(minutes) Test Pressure: (mbar)
Test Gauge Type: _______________ Gauge Calibration 2.) DESIGN: Date: ___/___/___(digital only) Serial Number: _______________
PLEASE COMPLETE IN BLOCK CAPITALS
Test Result: Pass Fail
1.) GENERAL: PLEASE COMPLETE IN BLOCK CAPITALS
Peak Energy Requirement Complete Address: ______________________________________________________
(kW) (Please state total input load of all appliances in kW) ____________________________
______________________________________________________
Supply Pressure (from Customer meter) Name: ______________________________________________________
(mbar)
Customer Tel: ______________________________________________________
4.) INTEGRITY TEST: PLEASE COMPLETE IN BLOCK CAPITALS GPRN: _______________
2.) DESIGN: PLEASE COMPLETE IN BLOCK CAPITALS
3.) CONSTRUCTION (Soundness Test for Pipework): PLEASE COMPLETE IN BLOCK CAPITALS
Peak Energy Requirement (kW) (Please state total input load of all appliances in kW)
Date of Test: ____/____/____ Time of Test: __________ Supply Pressure Test (from Result: meter) Pass Fail (mbar)
Diameter(s) of Tested Pipework: __________ Test Duration: _________(minutes) Test Pressure: ________________
Test Gauge Type: _______________ Gauge Calibration Date: ___/___/___ Serial Number: _______________
Date of Test: ____/____/____ Time of Test: ________ Confirm Appliances NOT Connected:
Diameter(s) of Tested Pipework: __________ Test Duration: ________(minutes) Test Pressure: __________(mbar)
Test Gauge Type: _______________ Gauge Calibration Date: ___/___/___(digital only) Serial Number: _______________
Test Result: Pass Fail
3.) CONSTRUCTION (Soundness Test for Pipework): PLEASE COMPLETE IN BLOCK CAPITALS
Print Name: ______________________________ Position in Company: ______________________________
Sign Name: ______________________________ Contact Number: ______________________________
Company Name:_____________________________ Address: ______________________________
I.D. Number: ______________________________ Email: ______________________________
I hereby declare, being competent to do so, that the gas pipe work at the above premises was constructed under my control to meet with the requirements of I.S.
820 and I hereby declare the accuracy of this statement for which I accept sole responsibility.
IMPORTANT: This section can also be used to recertify pipe work after repairs to a damaged or leaking installation.
IN THE EVENT OF A GAS ESCAPE—CONTACT BORD GAIS Print EMERGENCY Name: ______________________________ LINE: 1850 20 50 50
Position in Company: ______________________________
Sign Name: ______________________________ Contact Number: ______________________________
IMPORTANT SAFETY NOTICE TO
Company
OPERATOR:
Name:_____________________________ Address: ______________________________
I.D. Number: ______________________________ Email: ______________________________
Take precautions to avoid the presence of flame, spark, electric arc, incandescent heat source etc.
Turn gas off at the isolation valve. Open as many windows and doors as possible and leave the premises.
CUSTOMER / OPERATOR COPY
ALL DETAILS MUST BE PROVIDED FOR THIS DECLARATION TO BE ACCEPTED. THIS DECLARATION MUST BE SIGNED BY THE PERSON(S)
RESPONSIBLE FOR CARRYING OUT THE DESIGN, CONSTRUCTION AND/OR INTEGRITY TEST. NATURAL GAS WILL ONLY BE MADE AVAILABLE TO
THE PREMISE ON OR AFTER RECEIPT OF THIS COMPLETED DECLARATION.
1.) GENERAL: PLEASE COMPLETE IN BLOCK CAPITALS
Complete Address: ______________________________________________________
______________________________________________________
Customer Name: ______________________________________________________
Customer Tel: ______________________________________________________
GPRN: _______________
(Gas Point Registration Number, specific to your premise.
Available by contacting Bord Gáis Networks 1850 200 694)
2.) DESIGN: PLEASE COMPLETE IN BLOCK CAPITALS
REPAIR ONLY: Please tick box if repair only and not a new installation.
Issued To:
The gas installation at the above premise was designed under my control to supply the peak energy requirement (load requirement) at the
specified pressure (from the meter) at the point of delivery and meets with the requirements of clause 4 of I.S. 820. Issued To:
Print Name: ______________________________ Position in Company: ______________________________
Sign Name: ______________________________ Contact Number: ______________________________
(Customer/ Consultant / Installer)
Company Name:_____________________________ Address: ______________________________
I.D. Number: ______________________________ Email: ______________________________
Print Name: ______________________________ Position in Company: ______________________________ Date Issued: _____ /_____ /_____
Sign Name: ______________________________ Contact Number: ______________________________
Company Name:_____________________________ Address: ______________________________
I.D. Number: ______________________________ Email: ______________________________
The gas installation at the above premise was designed under my control to supply the peak energy requirement (load requirement) at the
specified pressure (from the meter) at the point of delivery and meets with the requirements of clause 4 of I.S. 820.
REPAIR ONLY: Please tick Print box Name: if repair ______________________________ only and not a new installation. Position in Company: ______________________________
Sign Name: ______________________________ Contact Number: ______________________________
Print Name: ______________________________ Position in Company: Company ______________________________
Name:_____________________________ Address: ______________________________
Sign Name: ______________________________ Contact Number: I.D. Number: ______________________________ Email: ______________________________
Company Name:_____________________________ Address: ______________________________
I.D. Number: ______________________________ Email: ______________________________
Print Name: ______________________________ Position in Company: ______________________________
Sign Name: ______________________________ Contact Number: ______________________________
Company Name:_____________________________ Address: ______________________________
I.D. Number: ______________________________ Email: ______________________________
REPAIR ONLY: Please tick box if repair only and not a new installation.
Print Name: ______________________________ Position in Company: ______________________________
Sign Name: ______________________________ Contact Number: ______________________________
Company Name:_____________________________ Address: ______________________________
I.D. Number: ______________________________ Email: ______________________________
5.) ADMISSION OF GAS & APPLIANCE COMMISSIONING: PLEASE COMPLETE IN BLOCK CAPITALS
IC ## ## ## ##
NON-DOMESTIC PREMISES GAS INSTALLATION
DECLARATION OF CONFORMANCE
____________________________
(Customer / Consultant / Installer)
Date Issued: _____ /_____ /_____
The gas installation at the above premise was designed under my control to supply the peak energy requirement (load requirement) at the
specified pressure (from the meter) at the point of delivery and meets with the requirements of clause 4 of I.S. 820.
Peak Energy Requirement (kW)
Supply Pressure (from meter) (mbar)
(Please state total input load of all appliances in kW)
Print Name: ______________________________ Position in Company: ______________________________
Sign Name: ______________________________ Contact Number: ______________________________
Company Name:_____________________________ Address: ______________________________
I.D. Number: ______________________________ Email: ______________________________
3.) CONSTRUCTION (Soundness Test for Pipework): PLEASE COMPLETE IN BLOCK CAPITALS
I hereby declare, being competent to do so, that the gas pipe work at the above premises was constructed under my control to meet with the requirements of I.S.
820 and I hereby declare the accuracy of this statement for which I accept sole responsibility.
IMPORTANT: This section can also be used to recertify pipe work after repairs to a damaged or leaking installation.
Note: The Integrity Test (commissioning Soundness Test) is required when the admission of gas does not immediately follow the pipework test in accordance
with 6.2 of I.S. 820 or if appliances or components have been reconnected following the pipework test. The authorised person (non BGN) shall conduct an
Integrity Test.
I hereby declare, being competent to do so, that the gas pipe work / installation at the above premises was tested under my control to meet with the requirements
of clause 7 of I.S. 820 and I hereby declare the accuracy of this statement for which I accept sole responsibility.
IMPORTANT: This section can also be used to recertify pipe I hereby work after declare, repairs being to competent a damaged to or do leaking so, that installation. the gas pipe REPAIR work at ONLY the above premises was constructed under my control to meet with the requirements of I.S.
820 and I hereby declare the accuracy of this statement for which I accept sole responsibility.
IMPORTANT: This section can also be used to recertify pipe work after repairs to a damaged or leaking installation.
Print Name: ______________________________ Position in Company: ______________________________
Sign Name: ______________________________ Contact Number: ______________________________
Company Name:_____________________________ Address: ______________________________
I.D. Number: ______________________________ Email: ______________________________
As the operator you should be aware of the requirements of clause 10 of Irish Standard I.S. 820, relating to the safety in use and maintenance of the installation and in particular the
actions to be taken.
IC ## ## ## ##
INSTALLER COPY
ALL DETAILS MUST BE PROVIDED FOR THIS DECLARATION TO BE ACCEPTED. THIS DECLARATION MUST BE SIGNED BY THE PERSON(S)
RESPONSIBLE FOR CARRYING OUT THE DESIGN, CONSTRUCTION AND/OR INTEGRITY TEST. NATURAL GAS WILL ONLY BE MADE AVAILABLE TO
THE PREMISE ON OR AFTER RECEIPT OF THIS COMPLETED DECLARATION.
1.) GENERAL: PLEASE COMPLETE IN BLOCK CAPITALS
Complete Address: ______________________________________________________
______________________________________________________
Customer Name: ______________________________________________________
Customer Tel: ______________________________________________________
GPRN: _______________
(Gas Point Registration Number, specific to your premise.
Available by contacting Bord Gáis Networks 1850200694)
REPAIR ONLY: Please tick box if repair only and not a new installation.
4.) INTEGRITY TEST: PLEASE COMPLETE IN BLOCK CAPITALS
Issued To:
____________________________
(Customer / Consultant / Installer)
NON-DOMESTIC PREMISES GAS INSTALLATION
DECLARATION OF CONFORMANCE
Date Issued: _____ /_____ /_____
Date of Test: ____/____/____ Time of Test: ________ Confirm Appliances NOT Connected:
Diameter(s) of Tested Pipework: __________ Test Duration: ________(minutes) Test Pressure: __________(mbar)
Test Gauge Type: _______________ Gauge Calibration Date: ___/___/___(digital only) Serial Number: _______________
Test Result: Pass Fail
Note: The Integrity Test (commissioning Soundness Test) is required when the admission of gas does not immediately follow the pipework test in accordance
with 6.2 of I.S. 820 or if appliances or components have been reconnected following the pipework test. The authorised person (non BGN) shall conduct an
Integrity Test.
I hereby declare, being competent to do so, that the gas pipe work / installation at the above premises was tested under my control to meet with the requirements
of clause 7 of I.S. 820 and I hereby declare the accuracy of this statement for which I accept sole responsibility.
IMPORTANT: This section can also be used to recertify pipe work after repairs to a damaged or leaking installation. REPAIR ONLY
Date of Test: ____/____/____ Time of Test: __________ Test Result: Pass Fail
Diameter(s) of Tested Pipework: __________ Test Duration: _________(minutes) Test Pressure: ________________
Test Gauge Type: _______________ Gauge Calibration Date: ___/___/___ Serial Number: _______________
Print Name: ______________________________ Position in Company: ______________________________
Sign Name: ______________________________ Contact Number: ______________________________
Company Name:_____________________________ Address: ______________________________
I.D. Number: ______________________________ Email: ______________________________
5.) ADMISSION OF GAS & APPLIANCE COMMISSIONING: PLEASE COMPLETE IN BLOCK CAPITALS
I hereby declare, being competent to do so, that gas has been admitted to the installation in accordance with clause 8 of I.S. 820 and that all relevant paper work
including appliance declaration certificates have been given to the operator / customer.
Print Name: ______________________________ Position in Company: ______________________________
Sign Name: ______________________________ Contact Number: ______________________________
Company Name:_____________________________ Address: ______________________________
I.D. Number: ______________________________ Email: ______________________________
Print Name: ______________________________ Position in Company: ______________________________
Sign Name: ______________________________ Contact Number: ______________________________
Company Name:_____________________________ Address: ______________________________
I.D. Number: ______________________________ Email: ______________________________
IMPORTANT
The Integrity Test must be carried out and left on until it has been confirmed
by the Bord Gáis Networks representative.
IC ## ## ## ##
BGN SITE COPY
ALL DETAILS MUST BE PROVIDED FOR THIS DECLARATION TO BE ACCEPTED. THIS DECLARATION MUST BE SIGNED BY THE PERSON(S)
RESPONSIBLE FOR CARRYING OUT THE DESIGN, CONSTRUCTION AND/OR INTEGRITY TEST. NATURAL GAS WILL ONLY BE MADE AVAILABLE TO
THE PREMISE ON OR AFTER RECEIPT OF THIS COMPLETED DECLARATION.
(Gas Point Registration Number, specific to your premise.
Available by contacting Bord Gáis Networks 1850 200 694)
Issued To:
(Customer / Consultant / Installer)
NON-DOMESTIC PREMISES GAS INSTALLATION IC ## ## ## ##
DECLARATION OF CONFORMANCE
Date Issued: _____ /_____ /_____
BGN RETURN COPY
ALL DETAILS MUST BE PROVIDED FOR THIS DECLARATION TO BE ACCEPTED. THIS DECLARATION MUST BE SIGNED BY THE PERSON(S)
RESPONSIBLE FOR CARRYING OUT THE DESIGN, CONSTRUCTION AND/OR INTEGRITY TEST. NATURAL GAS WILL ONLY BE MADE AVAILABLE TO
THE PREMISE ON OR AFTER RECEIPT OF THIS COMPLETED DECLARATION.
(Gas Point Registration Number, specific to your premise.
Available by contacting Bord Gáis Networks 1850 200 694)
I hereby declare, being competent to do so, that the gas pipe work at the above premises was constructed under my control to meet with the requirements of I.S.
820 and I hereby declare the accuracy of this statement for which I accept sole responsibility.
I hereby declare, being competent to do so, that gas has been admitted to the installation IMPORTANT: in accordance This with section clause 8 can of I.S. also 820 be used and that to recertify all relevant pipe paper work after work repairs to a damaged or leaking installation.
including appliance declaration certificates have been given to the operator / customer.
Note: The Integrity Test (commissioning Soundness Test) is required when the admission of gas does not immediately follow the pipework test in accordance
with 6.2 of I.S. 820 or if appliances or components have been reconnected following the pipework test. The authorised person (non BGN) shall conduct an
Integrity Test.
I hereby declare, being competent to do so, that the gas pipe work / installation at the above premises was tested under my control to meet with the requirements
of clause 7 of I.S. 820 and I hereby declare the accuracy of this statement for which I accept sole responsibility.
IMPORTANT: This section can also be used to recertify pipe work after repairs to a damaged or leaking installation. REPAIR ONLY
Date of Test: ____/____/____ Time of Test: ________ Confirm Appliances NOT Connected:
4.) INTEGRITY TEST: PLEASE COMPLETE IN BLOCK CAPITALS
Diameter(s) of Tested Pipework: __________ Test Duration: ________(minutes) Test Pressure: __________(mbar)
Test Gauge Type: _______________ Gauge Calibration Date: ___/___/___(digital only) Serial Number: _______________
Test Result: Pass Fail
Date of Test: ____/____/____ Time of Test: __________ Test Result: Pass Fail
Diameter(s) of Tested Pipework: __________ Test Duration: _________(minutes) Test Pressure: ________________
Test Gauge Type: _______________ Gauge Calibration Date: ___/___/___ Serial Number: _______________
IMPORTANT
All sections must be completed fully
This copy entitled “BGN RETURN COPY” is to be faxed to the BGN National fax number below.
Also this copy “BGN RETURN COPY” can be scanned and emailed to the BGN National email address below.
A meter fit job will not be progressed until this correctly completed copy is received by BGN (Bord Gáis Networks).
CERTIFICATE FAX RETURN NUMBER
1850 211 447
CERTIFICATE EMAIL RETURN ADDRESS
icdcerts@bge.ie
QUERIES
Dublin Office: 01 6021405
Cork Office: 021 4534545
Figure 40: The Non-Domestic Declaration of Conformance.
Gas will not be made available unless the guidelines
highlighted in section 7 are adhered to.
47

Steps to getting meter fitted:
Step 1: Requesting the Meter:
The Customer/End User should contract with a
natural gas supplier before requesting a meter, refer
to “Coordinating the Gas Connection” page 11. On
completion of gas service and finalising of contract,
the customer contacts the natural gas supplier (not
Bord Gáis Networks) to request the fitting of the
meter.
Step 2: Declaration of Conformance:
The following sub-sections of the Declaration of
Conformance Certificate; 1) General, 2) Design and
3) Construction, should be completed and the copy
entitled “BGE - Office Copy” sent to the Bord Gáis
Networks fax number (1850 211 447).
Step 3: Bord Gáis Networks:
Bord Gáis Networks organise an appointment with
the Customer’s nominated gas installer to coordinate
the meter connection.
Step 4: Declaration of Conformance:
To comply with Irish Gas Standards, sub-section
4, the Integrity Test should be completed by the
Customer’s nominated gas installer on-site and the
installation left “on test” until the Bord Gáis Networks
meter fitter arrives to site. The copy of the Declaration
of Conformance entitled “BGE - Site Copy” is collected
by the Bord Gáis Networks representative.
Step 5: Natural Gas is Made Available:
Only on completion of the above steps may gas be
made available. The Bord Gáis Networks representative
commissions the meter.
Step 6: Connection is Complete:
The customers’ nominated gas installer admits gas
and commissions the installation, equipment and
appliances.
Note:
The fitting of meter is requested by the
customer to a natural gas supplier (not Bord
Gáis Networks). An appointment can only
be scheduled after the Bord Gáis Networks
“Office Copy” of the certificate has been
received
Completing the declaration of conformance
Section 1 of Certificate
– General:
The Customer is required to contact New
Connections 1850 427 737 to obtain the
GPRN (Gas Point Registration Number) which
is then entered onto the Certificate.
Note:
the certificate can not be processed without the
gprn. The customer should quote this number
to the natural gas supplier when requesting the
meter to be fitted.
Section 2 of Certificate
– Design:
The Design section should be completed by the person
responsible for the design of the gas installation
downstream of the point of delivery (in accordance
with Irish Standard I.S 820).
The designer of the pipework should provide
information on the design and location of the
pipework to the persons responsible for construction.
Whilst bord gáis networks may supply to a number
of points of delivery for a single property, installation
pipework may only be supplied from one point of
delivery.
The pipework should be designed and constructed to
enable ease of testing and purging.
48

As stated within i.S. 820 – Any person responsible for
design should be a competent person as defined by
the irish gas standards.
Section 3 of Certificate
– Construction:
The Construction section should be completed by the
person responsible for the construction of the gas
installation downstream of point of delivery and in
accordance with Irish Standard I.S 820.
During the construction of the pipework care should be
taken to prevent the ingress of foreign matter (e.g. dirt,
water, swarf, thread cutting oil etc) into the pipework.
Foreign matter which has entered the pipework should
be removed.
Open ends of pipework and valve outlets should be
sealed with an appropriate fitting.
Gas pipework should be identified in accordance
with I.S.820, refer to page 46 of this document -
“Identification of Gas Pipework”.
Pipework should be installed so that it does not impose
excessive stress on devices or components incorporated
into the pipework. e.g. meters, regulators, etc.
The gas meter, the gas regulator/governor, the gas train
of the appliances should never be subjected to the
contractor’s pressure test. Non compliance with the
above test requirement will inevitably lead to expensive
damage being incurred and resultant delays.
To carry out the test the contractor should isolate and
blank their own work and only apply a test to the gas
carrying pipework.
As stated within I.S 820 – any person responsible for
Construction should be a competent person.
All tests should be performed in accordance with the
test requirements detailed in this document and the
current edition of I.S 820.
components have been reconnected following the test.
Then before proceeding with the admission of gas, the
authorised person (not Bord Gáis Networks) should
conduct an Integrity test.
The Integrity section should be completed by the
person responsible for the Integrity/Commissioning test
of the gas installation downstream of point of delivery
(in accordance with Irish Standard I.S 820). As stated
within I.S 820, any person responsible for the Integrity
Testing should be a competent person.
Under no circumstances should any equipment other
than the installers piping be included in the Contractors
Test.
Any pipework not in use should be disconnected,
purged and plugged, capped or sealed at each end.
Where practicable, gas pipework not in use should be
dismantled.
In performing the test the contractor should isolate
and blank off their own work and only apply a test to
the gas carrying pipework.
All tests should be performed in accordance with the
test requirements as detailed below and within the
current edition of I.S 820.
The installation should remain “on test” until the
Bord Gáis Networks meter fitter arrives to site and
commissions the meter.
Section 5 of Certificate
– Admission of Gas and Turn On:
Purging and Admission of natural gas should be carried
out by a competent person in accordance with I.S.820.
Natural gas is admitted to the premise by the Gas
Installer nominated by the Customer.
The admission of gas should be supervised by the
authorised person responsible for carrying out the
Integrity Commissioning Test.
Section 4 of Certificate
- Integrity (Commissioning) Test:
The Integrity Test (Commissioning Soundness Test) is
required if the admission of gas does not immediately
follow the initial construction test, or if appliances or
49

Testing of pipework
Safety
The test procedure should not jeopardise the safety of persons or property. All
testing operations should comply with the following:
i) the task should be performed by competent persons;
ii)
iii)
iv)
the person responsible for the test should ascertain the extent of the pipework
to be tested;
the person responsible for the test should be present during pressurising and
depressurising the pipework;
the test should be carried out in situ and where possible all joints should be
easily accessible and free from covering; Open ends of pipework and valve
outlets should be sealed with an appropriate fitting;
v) any appliances or other components considered not capable of withstanding
the test pressure should be disconnected or isolated. e.g. regulators, meters,
safety devices, etc;
vi)
vii)
viii)
ix)
only work related to the test is carried out on the pipework while the test is in
progress;
if the test is deemed to be potentially dangerous when the test is in progress,
persons not under the supervision of the person responsible for the test should
be prohibited from the area and warning signs should be displayed;
during the test any pressure increase should be gradual;
if the test is not immediately followed by commissioning, the pressure in the
pipework tested should be reduced to working pressure and the pipework
sealed.
50

Strength & soundness testing:
General
• New pipework, and/or any pipework materials and components that have been
modified, should only be put into service or put back into service if the tests
specified in Section 6 of I.S. 820 have been carried out successfully.
• In the event of failure of a test, defective parts should be repaired or replaced.
After elimination of leaks the test may be repeated.
Test Equipment
The pressure gauge used for the test should be capable of being read in graduations
of at least 1% of the required test pressure.
For pressures < 100mbar, a water gauge (manometer) with a mm scale should be used.
For pressures < 300mbar, a mercury or High Specific Gravity manometer should be used.
For pressures > 300mbar a verified gauge should be used.
Test Pressure
The test pressure chosen for a strength and soundness test to be carried out on
any pipework described in General above should be a function of its intended
Maximum Operating Pressure (MOP) as indicated in the table below.
MOP
Test pressure
2bar < MOP < 5bar
> 1.40 x MOP
100mbar < MOP < 2bar > 1.75 x MOP
40mbar < MOP < 100mbar > 2.5 x MOP
< 40mbar > 100mbar
< = NOT MORE THAN
> = NOT LESS THAN
Stabilisation Periods and Test Duration
Stabilisation periods and test durations have been chosen to reduce the effect of
variations of fluid temperature and atmospheric pressure on measured pressure.
The test duration depends upon the diameter of the pipework and a period of time
should elapse after pressurisation to allow temperature stabilisation to occur.
• Care should be exercised to exclude, where possible, the effects of changes in
ambient temperature or influences of any local heat sources for the duration
of the stabilisation and test.
A minimum period of five minutes should be given to allow stabilisation of test
fluid temperature.
51

The test pressure duration should comply with the
following pipework diameter correlations:
– for diameters < DN 50 ID . . . 5 minutes minimum
– for diameters > DN 50 ID . . . 30 minutes minimum
Verification
• The strength & soundness (Refer to “Test
Pressure” above) of the pipework should
be verified by the absence of any difference
between the pressure measured at the start and
at completion.
• Any appliance or component forming part of
the installation which was excluded from the
pipework test is reconnected to the system.
The connections should be tested for soundness
using either a leak detection fluid or a gas
detector as part of the commissioning test.
FLUE TESTING
ANY OPEN FLUE APPLIANCE SHOULD BE TESTED AND
PROVED FREE OF SPILLAGE
VENTILATION
ADEQUATE PERMANENT VENTILATION SHOULD BE
PROVIDED TO ENSURE PROPER COMBUSTION AND
EVACUATION OF COMBUSTION PRODUCTS FROM ANY
APPLIANCE/ EQUIPMENT FITTED. IN INSTANCES WHERE
PERMANENT VENTILATION TO A ROOM IS PROVIDED
THROUGH A VENT CONTAINING A FILTER, ALL OPEN-
FLUE APPLIANCES SHOULD BE FITTED WITH AN
ATMOSPHERIC SENSING DEVICE AND GAS CONTROL
SWITCH.
52

Project manager/gas installer responsibility:
The Project Manager and Gas Installer should
ensure the following:
(a)
(b)
That the completed Declaration of Conformance
Certificate entitled, “Customer/Operator Copy” is
given to the building operator and/or owner.
That all related paperwork is given the to
Operator/Customer (including Appliance
Declaration Certificates and Pipework Installation
Drawings).
Operator responsibility:
The safe operation and maintenance of the installation
downstream of the point of delivery, from the time of
commissioning, is the responsibility of the operator of
the property being supplied.
At a given moment and for a given installation (or
section thereof) there should be only one operator,
or operator designated person in charge of the
installation.
Bord Gáis Networks is responsible for the gas main and
service pipe up to and including the point of delivery
(normally including the primary meter). The gas user /
property owner / property operator is responsible for
the installation pipework, equipment and appliances
after the point of delivery.
Only persons authorised or appointed by the operator
may carry out work or operate the installation.
The operator of the pipework should, where the extent
of the installation so dictates, have at their disposal
descriptive information concerning its location, its
nature and/or a plan of its layout which they should
keep up to date. In the case of premises where the
operator may not be present at all times or locations,
this information in graphic form showing pipework
and isolation valves, should be displayed in the security
or operations centre of the premises.
The operator should keep the isolation valves identified
and accessible at all times.
To ensure operational efficiency and continued site
safety, the operator should implement ANNUAL
servicing and preventative maintenance on all natural
gas equipment.
53

Appendix
Gas market deregulation terminology:
(Refer to CER website www.cer.ie for further
information)
Capacity – Space booked in the natural gas
network for the purpose of moving gas from point to
point
CER – Commission for Energy Regulation
Commodity – The quantity of gas flowing through
the network in any given period
Eligible Gas Customer – Gas Customers who
are entitled to have their natural gas supplied by any
licensed supplier
End User – A customer who has entered into an
agreement with a Shipper to purchase and/or utilise
natural gas taken from the Transportation System
(The Natural Gas Network)
Siteworks – Siteworks (within the context of
deregulation terminology) are defined as the process
required to facilitate Shippers to arrange for changes or
upgrades to the connection of an existing gas point or
connection of a new gas point
Supplier – A supplier directly sells natural gas to a
customer (this supply function may or may not include
shipping). The CER licences suppliers only when it is
satisfied as to their ability to finance their operations
and provide a satisfactory level of service to the
customer
TPA – Third Party Access allows other users to
transport natural gas through the Bord Gáis owned
network
Entry/Exit – Under an entry/exit regime Shippers
can transport natural gas from any Entry Point to any
Exit Point and trade gas at the Irish Balancing Point in
accordance with the provisions of the Unified Code
of Operations
GPRN – Each gas point (entry or exit) has a
unique reference number known as the Gas Point
Registration Number
GPRO – The Gas Point Registration Operator (GPRO)
is the independent administrative service that has
been established to support the newly competitive
natural gas market and market opening process. The
GPRO manages the register of all gas points (entry or
exit) across the country on behalf of all shippers
The Gas Point Registration Operator is the unit
responsible for registering customers with their
respective suppliers. The GPRO will notify end users
of their eligibility. Consult the Bord Gáis Networks
website for further details
Nominated Consumption – The annual quantity
(estimated annual consumption) of gas which the
consumer indicates they require from the supplier at
their premise(s)
Shipper – Any person having entitlement by way of
contract with the Transporter to transport natural gas
through the natural gas network
54

Gas load terminology:
MHQ – Maximum Hourly Quantity (Alternatively PHQ
or PHC)
PHQ/C – Peak Hourly Quantity/Capacity
MDQ – Maximum Daily Quantity (alternatively PDC or
PDQ or PDV)
PDC/Q/V – Peak Day Capacity/Quantity/Volume
EAC – Estimated Annual Consumption (alternatively EAQ)
EAQ – Estimated Annual Quantity
MDL – Maximum Design Load
SPC – Supply Point Capacity
scmh – Standard Cubic Metres per Hour
Mscm – Million Standard Cubic Metres
1 GWh = 1,000MWh = 1,000,000kWh
The Supply Point Capacity represents the
maximum daily volume of gas expected to be off
taken at the Supply Point during normal operation.
Supply Point being an exit from the gas distribution
pipes system serving a single user and made up of
one or more gas points.
The capacity at the Supply Point is the amount that
is reserved on behalf of the customer for peak day
usage (MDQ). It is used for the purpose of booking
and charging capacity.
The Supply Point Capacity level is determined by
Bord Gáis Networks in accordance with procedures
approved by the Commission for Energy Regulation.
The Maximum Hourly Quantity is not always
the same as the Maximum Design Load.
The Maximum Design Load can include provision for
sudden gas requirements due to equipment start-up,
or allowances for future site expansion.
55

Technical terminology
Authorised Person
A competent person who is appointed by the client/
customer to fulfil a given task on an installation
system as defined by Irish gas standards
bar, barg, mbar, mbarg
Measure of pressure – barg and mbarg refer to
“gauge pressure”, that is, the pressure relative to
atmospheric pressure. 1bar = 1,000mbar
Building Line
The outermost extent of the building structure
(archway, balcony or basement) projected vertically
on to ground level Gas mains, services and meters
transporting gas at pressures greater than 100mbar
are not permitted inside the building line of
occupied premises. However, they are permitted
within privately owned and managed zones without
occupied space or safety risks above or below. In this
instance, the property supplied should be detached
and not form part of a multi-occupancy building.
1 1
5
5
3
4
Building Regulations (TGD’s)
Irish Building Regulations (Technical Guidance
Documents)
Coating
A factory applied light wrapping, paint or other
suitable substance applied to a pipe to protect
against corrosion
Commissioning
The activities required to pressurise pipework,
stations, equipment and assemblies with the fuel gas
and to put them into operation
Compartment
An enclosed space within a building specially
designed or adapted to house gas equipment
Competent Person
A person having the ability, appropriate training,
knowledge and experience to supervise or carry out
work in a safe and proper manner
Daily Metering
Electronic Daily metering is placed on all
industrial and commercial connections with
an estimated annual consumption greater
that 5.55GWh. Daily metering allows for
accurate billing of large fuel quantities
consumed
Design Pressure (of Pipework)
The pressure for which the designer should
make allowance in specifying materials and
construction methods in order that the
pipework will safely withstand the maximum
incidental pressure, soundness and strength
test as applicable.
DN
Alphanumeric designation of size for
components of a pipework system, which
is used for reference purposes. It comprises
the letters DN followed by a dimensionless
whole number, which is directly related to the
physical size, in millimetres, of the bore or
outside diameter of the end connections.
1 1
Key
1 Building line
2 Extended
basement
3 Building overhang
4 Balcony
5 Building
2
NOTE 1: The number following the letters DN
does not represent a measurable value and
should not be used for calculation purposes
except where specified.
NOTE 2: Where DN designation is used, any
relationship between DN and component
dimensions are given, e.g. DN/OD or DN/ID. “
Domestic Appliance
An appliance designed for household use
Figure 41: Building line illustration
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Flue
A passage for conveying the products of combustion
from the appliance to outside atmosphere
Fitter Fabrication
Where an authorised and competent person installs
a primary meter and regulator to a premise point on
behalf of Bord Gáis Networks
FFL – Finished Floor Level
The level of the floor immediately inside the building
Figure 42: Electronic Daily Metering for a Pharmaceutical
Plant Co. Roscommon
DRI
District Regulator Installation – A distribution
network pressure reduction station that reduces
gas pressure to allowable limits (normally reduces
Medium Pressure to Low Pressure) so that gas
mains may be positioned closer to buildings and
gas services and meters may be placed within the
building line
Duct
Purpose provided space constructed of building
materials for the enclosure of installation pipework
or other building services
FGL – Finished Ground Level
The level of the ground, landscape, footpath or road
immediately outside the building
Fire Resistant Duct
A duct constructed from material(s) rated as fire
resistant (Refer to Irish Building Regulations)
Fire Stopped
Building component/material designed to prevent the
spread of fire through walls or ceilings for an allocated
minimum period of time
Free Ventilation
Ventilation not reliant upon mechanical activation
Gas Main
A distribution pipeline, normally buried underground,
from which multiple end users are supplied with gas.
Refer to page 10. (Governed by Irish Standard
I.S. 329)
Gas Service
A distribution pipe connecting the distribution
network to a user’s meter and through which that
user’s gas is supplied. Refer to page 10. (Governing
Irish Standard I.S. 265)
Figure 43: A DRI located at Dundrum Shopping Centre
allowing meters to be positioned within the building line
ETCI Regulations
Electro-Technical Council of Ireland Regulations
EVCD
Electronic Gas Volume Conversion Device (in
relation to Daily Metering) used to convert
volume of gas measured at a meter from local to
reference conditions of Pressure, Temperature and
Compressibility
Ferrous Piping
Ferrous pipes are made of cast irons, low and
medium alloyed steels and specialty steels such as
tool steels and stainless steels. Note: Ferrous piping
can not be connected to Non-Ferrous piping such as
copper. The metals in contact cause a galvanic effect
and corrosion
Installation Pipework
A pipe system down stream of the point of delivery
terminating at the appliance(s) inlet(s) connection(s).
This refers to any gas pipework, fittings, meters
or ancillaries downstream of the point of delivery
nominated by Bord Gáis Networks. This point may
be either a combination of a regulator and valve or a
meter
Isolation Valve / Shut-Off Valve
A valve system which permits isolation of a part of or
the complete gas installation
Local Government (Multi-Storey Buildings)
Act 1988
See “Scope/Irish Standards” in Section 1 and Section
8 “Applicable Standards for Industrial/Commercial
Installations”
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LP – Low Pressure
Gas supplied from the Bord Gáis Network’s
distribution network at a pressure less than
100mbar. Normal pressure between 17mbarg and
100mbarg
Mechanical Joint
Compression, flange or union type joint. A type of
joint in which gas tightness is achieved mechanically
rather than by welding, brazing or soldering
Meter
A device to measure the volume of gas or quantity
of energy supplied
Meter Bypass
A meter bypass is used on larger installations where
there is typically 16 to 24 hours per day usage. It is
incorporated so that a shutdown period is kept to
an absolute minimum when meter maintenance is
required. The meter bypass is available for meters of
size G250 or above
Module
Pre–Fabricated meter and pressure regulator unit
within a robust plastic cabinet – supplied by Bord
Gáis Networks
MP – Medium Pressure
Gas supplied from the Bord Gáis distribution
network at a pressure greater than 100mbar, but
not greater than 5bar. For pressures greater than
100mbar, gas mains, services and meters may not
be positioned/located within the building line
Multi-Occupancy Building
A building which contains different, separate
ownerships or tenancies
Multi-Storey Building
A building comprising of, or including, five or more
storeys. A basement being regarded as a storey (see
also storey)
Natural Gas
Gas largely consisting of methane, distributed
through a network of pipes
Natural Ventilation
Sufficient air movement in a space to ensure one
air change per hour (minimum). See Naturally
Ventilated Basement
Naturally Ventilated Basement
A naturally ventilated basement is a space below
or partially below a building with air openings of
sufficient size to cause free air flow at all times.
Should gas service pipework or meter installations
be required in this space, the minimum air opening
requirements should comply with the Building
Regulation’s defination of a Naturally Ventilated
Basement (Technical Guidance Documents, Section B
3.5.2.4)
Non–Ferrous Piping
Refer to ferrous piping for excluding categories
Open Riser
Rising pipework not enclosed as it passes through
living or shared spaces in the building
Pressure Reduction
Process needed to reduce the gas pressure from
the service before passing through the gas meter
and onto load requirement. Only gas services
operating at a pressure less than 100mbar may
enter a building. Therefore, if placing meters within
a building, gas at a pressure of less than 100mbar is
required
Point of Delivery
The point immediately downstream of the control
device fitted to terminate the service pipe. Natural
gas service pipes terminate in a combination of a
regulator and isolation valve
Polyethylene (PE)
A plastic polymer which is widely used in fluid
transportation such as natural gas. Polyethylene
pipework is not permitted within the building
Purge/Purging
A procedure for safely removing air or inert gas from
pipework and replacing it with combustible gas, or
the reverse procedure
Regulator/Governor
A device which reduces the gas pressure to a set
value and maintains it within prescribed limits
Riser
Installation pipework rising vertically within or
outside a building to supply one or more premises
Safety Device
Equipment designed to automatically shut off the
gas supply in the event of a condition exceeding a
pre-set limit
Service Shaft
A space specifically designed and constructed for the
passage of building services
Sleeve
A length of rigid protective pipe impervious to gas,
through which a gas pipe passes. The sufficiently
sized annulus between the sleeve and gas pipe
allows for normal expansion/contraction and acts as
a conduit for gas in the event of leak
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Storey
Any of the parts into which a building is divided
horizontally above or below ground level. It excludes
any structure situated above the level of the roof or
below the lowest floor, which is intended for the
protection of a water tank or lift motor or similar
use. Such structures should not be for or adapted
for habitable purpose or as a workroom/store room
Supervision System
A combination of sensing equipment and control
equipment designed and installed to activate a
safety device
Supply Pipework
Refer to installation pipework
Ventilated Space
A space where the air is permanently replaced by
natural or mechanical means
Vent Pipe
A pipe to convey the flow of venting gas to a safe
location
Void
A space in a building lacking any air flow. Any
enclosed, generally inaccessible and unventilated
space
Wrap
Material used to protect pipes from corrosion
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Properties of Natural Gas (at 15°C and 101.3kPa)
Property
Gross Calorific Value (GCV) of Gas
Natural Gas
36.5 to 47.2MJ/ml
(Real Gross Dry)
Relative Density (air = 100) 0.55 - 0.7
Flammability Limits
(% Volume in Air):
Upper: 15
Lower: 5
Family
2nd Family Group H
For a more detailed Material Safety Data Sheet (MSDS)
contact Bord Gáis Networks at 1850 427 737.
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NEW NATURAL GAS CONNECTIONS
(ESSENTIAL INFORMATION REQUIRED FOR BORD GÁIS NETWORK DESIGN)
This information requested by Bord Gáis Distribution is essential for rapid progress of your development from design stage to final agreement
and eventual construction on site.
1 NAME AND ADDRESS OF DEVELOPER:
2 NAME OF DEVELOPMENT: PHASE NO:
3 LOCATION OF SCHEME: PHASING OF GAS LOAD: Y/N
4 CONTACT NAME(S): PHONE NO:
5 ADDRESS FOR CORRESPONDENCE:
6 TOTAL NUMBER OF METERED PREMISES: BUSINESS UNITS:
7 EXPECTED PROJECT COMMENCEMENT DATE: RESIDENTIAL UNITS:
8 EXPECTED NATURAL GAS BURN DATE:
DRAWINGS ( required via email, disc or CD ):
a. Site Location Map
b. Site Layout Drawings (with proposed meter locations & areas where open trench will be provided by the customer).
c. Basement Drawings and Archway Details
(only required when relevant to proposed path of gas mains, services or location of meters)
RESIDENTIAL CONNECTIONS:
d. Legend of Dwelling Type & Quantities of each Dwelling Type:
e. Appliances to be fitted as standard ..... Gas Fired Central Heating: Y/N Gas Fire: Y/N Cooking: Y/N
INDUSTRIAL AND COMMERCIAL CONNECTIONS:
f. Including items a and b and c above
g. Legend of Building Functions(s)/Use(s)
h. Peak Fuel Consumption(s) / kW - - - - 1/ Max. Hourly Quantity (MHQ):
2/ Max. Daily Quantity (MDQ):
i. “Estimated” Annual Consumption(s) - kWh (see “Meter Form” on following page)
j. Proposed meter location (as provided on site layout drawing + as detailed below):
k. Premise Status: Existing Building Y/N New Building Y/N Increasing Load Y/N
l. Outlet Pressure Required: Standard (20mBar): _______________ Other: _______________
Technical Details & Required Information, please attach and forward to ...
plans@bge.ie
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Industrial / Commercial Meter:
No.
THIS FORM IS FOR AN INDUSTRIAL / COMMERCIAL METER OR A RESIDENTIAL METER CONSUMING GREATER THAN 6 METRES CUBED
OR 66 kW OF NATURAL GAS PER HOUR
LOAD INFORMATION (The following equipment information is REQUIRED to process your application for this meter ONLY. Please indicate the gas equipment being installed
and the associated load. Prepare a separate form for each meter
LIST ALL EQUIPMENT
(NEW & EXISTING):
Example:
Gas Consuming
Item 1 Item 2 Item 3 Item 4 Item 5 Item 6
New:
Existing:
X
Equipment type:
Boiler
Quantity:
1
EQUIPMENT INPUT PER HOUR
(kW/hr):
(MBtu/hr):
2,000
OPERATING SCHEDULE
(hours per day):
(days per week):
(weeks per year):
9
5
39
TYPE OF ALTERNATIVE FUEL:
(if applicable, quantity consumed p.a.)
LPG/Oil
EQUIPMENT FUNCTION:
Space Heating
Will meter protection be provided ?
What pressure is Required after the Meter ? Standard (20mBar): Other (specify):
62

Reader’s notes
63

Applicable standards for industrial/
commercial installations
European Codes/Irish Standards:
The appropriate Irish Standards are as follows
• I.S. 329 – Code of Practice for Distribution Gas
Mains (Bord Gáis Networks)
• I.S. 265 – Installation of Gas Service Pipes (Bord
Gáis Networks)
• I.S. EN 1776 – Gas Supply Systems – Natural Gas
Measuring Stations
• I.S. EN 12327 – Gas Pressure Testing,
Commissioning and Decommissioning Procedures
• EN 15001-2 and I.S./EN 15001-2
• I.S. 820 – Non Domestic Gas Installations
• I.S. 813 – Domestic Gas Installations
www.nsai.ie www.standards.ie or (01) 8073878
Technical Guidance Documents (Building Regulations)
Local Government (Multi-Storey Buildings) Act 1988
Government Publications Sales Office
Sun Alliance House
Molesworth Street
Dublin 2
Tel: (01) 647 6879
Please Note:
Bord Gáis Networks give technical guidance to customers, their designers and installation
contractors who wish to become connected to the Bord Gáis Network
For Your Next Development:
Phone New Connections on: 1850 411 511
Send Site Development Drawings to:
plans@bge.ie
Website: www.bordgais.ie Revision 2
July 2010 Document no: 25699
Disclaimer:
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or any means,
electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the publishers. The advice contained within
this document is a guideline only and based on the most authoritative information available at the date of issue. Users should ensure that it
is relevant to the specific circumstances in which they seek to apply it. Professional advice should always be sought. Although every effort has
been made to ensure information is correct, no responsibility will be accepted for any errors or omissions, nor any loss or damage which may
arise from errors or omissions. Current Laws, Regulations and Standards over-ride all contents of this guideline document. Users should ensure
they have up to date information. © Bord Gáis Éireann.
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GSDC 2508ic/3009