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Detailed Engineering Design Phase
Engineering Design Integrity Workfl ow

Introduction
Detailed Design Engineering Design
Integrity Workfl ow (EDIW)
EDIW is AMEC’s best practice guidance to Engineering Managers and supporting
personnel for the delivery of technical integrity. It is an ‘aide-memoir’ that highlights
the key deliverables and activities throughout the lifecycle of a typical Detailed Design
project.
Detailed Design is broken into seven phases:
1 Scope Defi nition and Engineering Execution Strategy
2 Commencement of Detailed Design
3 Initial Design Development and Hazard Identifi cation
4 Initial Design Review & Audit
5 Approval for Design (AFD)
6 Approval for Construction (AFC)
7 Design Close-Out
The workfl ow shown in the EDIW Road Map illustrates the execution sequence on a generic
Detail Design Project. The vertical columns show activities that can be undertaken concurrently
whilst the sequential fl ow of work is across the Road Map. As the deliverables and activities in each
phase are completed, work can transition into the next phase.
Situations will arise when work will need to be be done out of sequence, typically to meet a
demanding project schedule. Use of the EDIW allows the risks of out-of-sequence working to be
identifi ed and the necessary mitigation strategies to be put in place.
AMEC’s corporate governance and assurance of Engineering will measure compliance with the
EDIW workfl ow and ensure out-of-phase working is being identifi ed and managed. This document
contains a copy of the Detail Design EDIW Workfl ow Road Map and includes detailed descriptions of
the activities, the key engineering disciplines and supporting documentation.
1

Phase 1
Scope Defi nition and Engineering Execution Strategy
Preparation for commencement of detail design. To evaluate FEED deliverables to ensure
engineering is suffi ciently mature for detail design to progress in a controlled and minimal
change environment. To confi rm Engineering Execution Plan.
Activities / Deliverables Description
1
2
3
4
5
6
Engineering
Execution Strategy
Feed / BoD
Validation
Project Baseline
Standards
Engineering Audit
Schedule
Engineering
Execution Plan &
Engineering
Organisation Chart
Integrated
Engineering
Systems
7 QRA & FRA Strategy
8
9
10
11
Discipline Job
Design Specifi cation
Level 3
Engineering Plan
Confi rm CE
Compliance Strategy
Technical Risk
Register
Review / confi rm Engineering Execution Strategy, e.g.
execution locations, workshare, disciplines required,
specialist support, etc.
Confi rm maturity of Front End Engineering Design. Identify
any areas of concern and ensure these are captured on the
Technical Risk Register.
Establish which codes, standards and specifi cations are to be
utilised, eg. Corporate, project, client, and confi rm procedure.
Include in Engineering Execution Plan and / or Discipline Job
Design Specifi cations.
Create formal schedule to identify when technical integrity
audits, design reviews, HAZIDS, HAZOPS, etc are to be carried
out. Align to Level 3 Engineering Plan and include in
Engineering Execution Plan.
Create Engineering Execution Plan complete with key
supporting documents / information.
Agree engineering design tools to be used and confi rm
that system hardware, software and support is available.
Include issues such as PDMS or PDS, Cats and Specs, survey
methods, dimensional control techniques, etc. Document and
record in the Engineering Execution Plan and discipline job
design specifi cations.
Establish status of project Quantitative Risk Assessment
(QRA), Fire Risk Assessment (FRA) and Emergency Escape &
Rescue Assessment (EERA) information and confi rm
methadology for timely delivery into engineering design
process. Agree accountability for delivery, eg. Client, 3rd
party, AMEC, and record in Engineering Execution Plan.
Defi ne the key project specifi c design parameters and
operational constraints that are applicable to the appropriate
discipline for the detailed design of the project. To identify key
individuals, roles and responsibilities, design tools, key codes
and standards, etc.
Agree work breakdown structure, develop CTRs and create
level 3 integrated engineering plan covering all disciplines. To
be included in Engineering Execution Plan.
Review and confi rm strategy for CE Compliance . Ensure
discipline Lead Engineers are aware of their responsibilities
and appropriate resources / measures are in place.
Create formal Technical Risk Register identifying all possible
risks asscociated with the engineering design.
Key
Discipline
Project
Manager
and Project
Engineering
Manager
Project
Engineering
Manager
Project
Engineering
Manager
Project
Engineering
Manager
Project
Engineering
Manager
Engineering
Systems
and All
Disciplines
Technical
Safety
All Disciplines
All Disciplines
Project
Engineering
Manager
Techncal Safety
Supporting Documentation
Tender documentation, Project Execution Plan
(PEP)
Engineering Baseline Standards, Document No.
OAG-X160-190-GDL-012 (previously
AOD-92-043 )
Technical Safety Events Schedule
(Lead Technical Safety Engineer)
Engineering Systems Project Start-up Manual,
Document No. OAGX160-170-MAN-002
Hazard Management Philosophy, OAG-X160-
190-GDL-009 (previously AOD-97-001):
Hazard & Risk Management, OAG-X160-190-
PRO-024
Corporate CE Compliance Strategy OAG-
X160-190-MAN-001; Project Compliance with
Pressure Equipment Regulations OAG-X160-
050-PRO-001; Pressure Equipment
Regulations Guidelines AOD-97-047; ATEX
Guidelines, OAG-X160-190-GDL-003; Machinery
Directive Guidelines, O&G-ENG-REP-29-001;
Electromatic Compatibility Regulations
Guidelines, OAG-X160-190-GDL-003; MC, The
Electrical Equipment (Safety) Regulations
Guideleines, OAG-X160-190-GDL-003.
2

Phase 2
Commencement of Detail Design
To formally kick off the Engineering Design Process in accordance with the project execution plan
and to ensure that key engineering strategies / philosophies are in place.
Activities / Deliverables Description
1
2
3
4
5
3
Performance
Standards &
Verifi cation Scheme
Document
Distribution Matrix
Structural Integrity
Interface
Material Selection
Report
Hazard Management
Plan
6 Piping Specifi cations
7 PDMS Calalogues
8 CMSS Philosophy
Confi rm safety critical systems / elements and set
appropriate performance standards. i.e. functionality,
reliability and survivability. Develop scheme to allow the
independent competent body (ICB) to verify the design
against the performance standards.
Create formal document distribution matrix to ensure all
disciplines & departments receive all necessary design
information in a timely manner.
Ensure structural integrity interfaces are identifi ed & visible
to Project, e.g. AMEC / Client focal points, Technical
Authorities, Independent Verifi cation Bodies, etc.
Report defi ning the requirements and specifi cations of
necessary material.
Create Hazard Management Plan identifying all key hazards,
technical safety activities and the approach to managing
Major Accident Hazards (MAH) in the design.
Develop / confi rm baseline piping specifi cations, utilising
AMEC Corporate specifi cations where possible.
Ensure PDMS catalogues are populated & available for all
affected disciplines, utilising AMEC Corporate data, i.e. CPC,
where possible.
Develop Control Monitoring and Safety Systems (CMSS)
Philosophy covering key instrumentation and control systems
e.g. Process Control System (PCS), Emergency Shutdown
System (ESD) and Fire and Gas (F&G).
Key
Discipline
Technical
Safety
Project
Engineering
Manager
Structural
Metallurgy
Technical
Safety
Supporting Documentation
Hazard Management Philosophy, OAG-X160-
190-GDL-009 (previously AOD-97-001); Hazard
& Risk Management, OAG-X160-190-PRO-024;
Design Verifi cation Activities (under DCR),
OAG-X160-190-PRO-028; Platform Safety Case.
AMEC Corporate Material Engineering
Specifi cations.
Hazard & Risk Management, OAG-X160-190-
PRO-024; Management of Functional Safety
Guideline OAG-X160-190-GDL-004
Piping AMEC Corporate Piping Specifi cations.
Engineering
Systems,
supported by
Piping,
Electrical,
Instruments,
Structural &
HVAC
Instruments

Phase 3
Initial Design Development and Hazard Identifi cation
To develop initial design deliverables to Inter Discipline Review (IDC) stage and identify key hazards.
Activities / Deliverables Description
1 HAZID
2 ENVID
3 PFD IDC
4
Shutdown & Blowdown
Philosophy
5 P&ID’s IDC
6 C&E IDC
7 Plot Plans / Layouts IDC
8
Hazardous Area
Layouts IDC
9 Equipment List
10
11
12
13
Mechanical Handling
Strategy
Particular Material
Appraisals (PMA)
Fire Risk Assessment
(FRA)
Emergency Escape &
Resecue Assesment
(EERA)
14 Dropped Object Study
15 Blast Design Philosophy
16 PFP / AFP Philosophy
17 HIPPS Review
Perform hazard identifi cation studies, as identifi ed on
Engineering Audit Schedule / Technical Safety Events
Schedule.
Formal assessment of environmental aspects associated
with a modifi cation or a change, and to propose
prevention or mitigating measures.
Issue Process Flow Diagrams (PFD’s) on formal
Inter-Discipline Review (IDC).
Explain the measures to prevent and control blowdown
and how this will be achieved.
Issue Piping & Instrumentation Diagrams (P&ID’s) on
formal Inter-Discipline Review (IDC).
Issue Cause & Effects for formal Inter-Discipline
Review (IDC).
Issue equipment Plot Plans / Layouts on formal
inter-Discipline Review (IDC).
Issue Hazardous Area Layouts for formal
Inter-Discipline Review (IDC).
Create master project equipment list identifying all
major items of tagged equipment, e.g. vessels, pumps,
motors, generators, hydrocycolnes, chemical injection
packages, electrical switchgear, control panels, etc.
Develop Mechanical Handling Strategy including general
approach / constraints, platform crane limits, installation
philosophy, operation and maintenance, etc.
Where required, i.e. where Corporate PMA’s or EAM’s
are not suitable, develop new PMA’s and obtain approval
from Notifi ed Bodies (NoBo’s).
Determine Fire & Explosion scenarios and identifi es
requirements for prevention, control and mitigation
measures.
Identify requirements for emergency escape & rescue,
e.g. lifeboats, escape routes, plant layout, etc
Identify and assess the potential risks to drilling,
production, process equipment, and manned areas from
dropped or swinging objects. Where the consequence
of a dropped object is considered signifi cant, to propose
prevention or mitigating measures.
Develop philosophy that assesses potential explosion
hazards and identifi es appropriate blast loadings to be
applied to the engineering design process, eg. Vessels,
pipe supports, structural steel, etc.
Develop philosophy that identifi es requirements for
Passive Fire Protection (PFP) and/or Active Fire
Protection (AFP).
Initial review to establish requirements for a High
Integrity Pressure Protection System.
Key
Discipline
Technical
Safety
Technical
Safety
Process
Process
Process
Process and
Instruments
Piping and
Layouts
Technical
Safety
Mechanical
Mechanical
and Structural
PED Focal
Point
Technical
Safety
Technical
Safety
Technical
Safety
Technical
Safety
Technical
Safety
Instruments
Supporting Documentation
Project Hazard Identifi cation (HAZID) AOD-92-
018; Engineering & Design Reviews, OAG-X160-
190-PRO-013.
Environmental Impact Identifi cation (ENVID)
OAG-X160-190-PRO-121; Engineering & Design
Reviews, OAG-X160-190-PRO-013.
Management of Functional Safety,
OAG-X160-190-GDL-004
4

Phase 4
Initial Design Review and Audit
To confi rm that the initial design development is robust.
5
Activities / Deliverables Description
1 Hazardous Area Review
2
3
P&ID Review and / or
‘Initial Hazop’
Plot Plans / Layout / 3-D
Model Review
4 C&E Review
5 Technical Audit
Formal Engineering discipline review of hazardous area
layouts to confi rm requirements for the correct selection
and location of equipment.
Formal Engineering discipline review of P&ID's to
confi rm design basis.
Formal Engineering review of Plot Plans / Layouts. The
review shall ensure that the layout design complies with
the required technical, safety, operability and
maintainability standards. Makes sure the layout is cost
effective, ensures the constructability of the work and
agrees the layout basis on which the detailed design can
proceed.
Formal review of Cause & Effects diagrams to confi rm
design basis and alignment with Hazard Management
Plan.
Obtain confi rmation, by sampling of project
documentation, that the engineering of the project is to
the required standard and free from errors.
Key
Discipline
Technical
Safety
Process,
Piping,
Technical
Safety,
Instruments
Piping and
Layouts,
Structural,
Mechanical,
Electrical,
Technical
Safety, Process
Instruments,
Process,
Technical
Safety
Independent
(Corporate
Engineering)
Supporting Documentation
Hazard and Risk Management Procedure
OAG-X160-190-PRO-024; Engineering &
Design reviews, OAG-X160-190-PRO-013
Formal Hazop, OAG-X160-190-PRO-017;
Engineering & Design Reviews, OAG-X160-190-
PRO-013
Engineering & Design Reviews,
OAG-X160-190-PRO-013
Hazard and Risk Management Procedure
OAG-X160-190-PRO-024; Engineering &
Design reviews, OAG-X160-190-PRO-013;
Management of Functional Safety Guideline
OAG-X160-190-GDL-004
Technical Audit Procedure
OAG-X160-190-PRO-022

Phase 5
Design Approval
To ‘Freeze’ the Process design, and develop dependent design & procurement activities.
Activities / Deliverables Description
1
PUWER
Assessments
2 HAZOP
3 SHE Audit (AFD)
4
5
Environmental
Report
Constructability
Review
6 P&ID AFD
Conduct initial PUWER assessment typically by review of
PDMS model and/or vendor / equipment supplier information
received to date.
Hazard and Operability Studies, a systematic multi-discipline
study based on the applications of guidewords to identify
causes of potential hazards and operability constraints in a
facility.
SHE Audit ensures that the design obligations under The
Health and Safety At Work Act 1974 and project health, safety
and environmental performance standards are being or have
been met during the engineering and design processes.
Issue fi nal report to document & confi rm that the design has
considered all applicable environmental aspects &
demonstrates that design controls have been included to
minimise / control the environmental impact.
Conduct formal Constructability Reviews to ensure safe and
effi cient installation of plant & equipment.
Issue Approved For Design (AFD) Process and
Instrumentation Diagrams.
Key
Discipline
Technical
Safety,
Mechanical
Process,
Technical
Safety
Technical
Safety
Technical
Safety
Affected
disciplines +
Construction /
Implementation
Group
Process
7 C&E AFD Issue Approved For Design (AFD) Cause & Effects. Instruments
8
9
Process Data Sheets
AFD
HP / LP Interface
Listing
Issue Approved For Design (AFD) Process Data Sheets. Process
Identify all HP / LP interfaces on formal register and ensure
that all have been addressed satisfactorily via HAZOP’s and /
or individual reviews.
10 Holds Register Develop register to record & manage post AFD design holds.
11 SIL Assessments
12 HIPPS Study
13
14
HIPPS Reliability
Study
SIL Achievement
Report
15 Flow Assurance
16
17
Verifi cation of
Vendor Information
& Certifi cation -
Design Completion
PFEER
Compliance Report
Conduct assessment to determine target Safety Integrity
Level (SIL). Note: Where the target SIL is 3, then it is likely
that a High Integrity Pressure Protection System (HIPPS) will
be required. If the value is found to be 1 or 2, then a HIPPS
will not be required.
Conduct study to formally identify the performance
requirements of the High Integrity Pressure Protection
System (HIPPS) and demonstrate that it is robust. Should
include dynamic study for a range of transient conditions.
Conduct study to formally demonstrate that the High Integrity
Pressure Protection System (HIPPS) complies with the
reliability & availability criteria for the Project, e.g. as
stipulated in the performance standards.
Conduct independent assessment to formally record that the
target Safety Integrity Levels (SIL’s have been achieved) Must
be completed prior to introduction of Hydrocarbons.
Conduct fl ow assurance studies to demonstrate the process
design under a range of fl ow conditions, i.e. start-up to 100%.
Verify, primarily through review of vendor documentation,
that their design & manufacture of fabricated packages, etc is
robust and contains suffi cient information to facilitate
completion of affected AMEC discipline design.
Issue fi nal report as documented confi rmation that the design
meets the requirements of the Prevention of Fire and
Explosion, and Emergency Response (PFEER) Regulations
Process
Engineering
Manager
Instruments
Process
Instruments
Independent
Competent
Person (ICP)
Process
Affected
disciplines
Technical
Safety
Supporting Documentation
Engineering & Design Reviews,
OAG-X160-190-PRO-013
Dependent on Project updated P&ID’s and
C&E’s may be prepared from commented IDC’s
from Phase 3 Formal HAZOP, OAG-X160-190-
PRO-017 (previously AOD-92-022); Engineering
& Design Reviews, OAG-X160-190-PRO-013
- Note: additional HAZOP’s may be required,
i.e. earlier or later in the project. PEM to
consult with Process & Technical Safety Lead
Engineers.
SHE Audit Procedure OAG-X160-190-PRO-023;
Engineering & Design Reviews, OAG-X160-190-
PRO-013
Engineering & Design Reviews, OAG-X160-190-
PRO-013
Engineering & Design Reviews,
OAG-X160-190-PRO-014
Management of Functional Safety,
OAG-X160-190-GDL-004
Management of Functional Safety,
OAG-X160-190-GDL-005
Management of Functional Safety,
OAG-X160-190-GDL-004
Management of Functional Safety, OAG-X160-
190-GDL-004
6

Phase 6
Approval for Construction (AFC)
To ensure that suffi cient design information & certifi cation is available to facilitate
safe installation, operation & maintenance.
Activities / Deliverables Description
1 SHE Audit AFC
2
IEC 61511
Compliance Report
3 PFD’s AFC
4
Operational Safety
Case Development
5 P&ID’s AFC
6
Quantative Risk
Assessment (QRA)
AMEC (LSE: AMEC) is a focused supplier of high-value consultancy, engineering and project management services to the world’s natural resources, nuclear, clean energy, water and environmental
sectors. With annual revenues of over £2.5 billion, AMEC designs, delivers and maintains strategic and complex assets for its customers. The company employs some 22,000 people in around
40 countries worldwide.
For further information please see amec.com
Conduct SHE Audit at AFC stage in accordance with
Harmonised Procedure.
Final report to formally demostrate that the Safety
Instrumented Systems comply with the requirements of
IEC 61511.
Issue Approved For Construction (AFC) Process Flow
Diagrams.
Commence operational Safety Case development.
Issue Approved For Construction (AFC) Process and
Instrumentation Diagrams.
Complete QRA activities to confi rm that the design is robust
and complies with legislative requirements.
Key
Discipline
Technical
Safety
Instruments
Process
Technical
Safety
Process
Technical
Safety
7 C&E AFC Issue Approved For Construction (AFC) Cause & Effects. Instruments
8
9
10
11
12
Operating
Procedures Review
/ Operational HAZOP
Fabrication
Drawings AFC
Verifi cation of
Vendor Information
& Certifi cation -
Installation,
Operation &
Maintenance
EC Design
Examination
Certifi cates
Declaration of
Conformity
Phase 7
Design Close-Out
Ensure operating procedures are verifi ed line by line against
the facilities provided on the P&ID’s.
Issue Approved For Construction (AFC) Piping Isometrics,
Structural Steelwork drgs, etc.
Verify, primarily through review of vendor documentation,
that their design & manufacture of fabricated packages, etc is
robust and contains suffi cient information to facilitate safe
installation, operation & maintenance.
Where AMEC are deemed to be the manufacturer of the piping
systems, then under the PED/PER, AMEC have to apply to the
Notifi ed Body (NoBo) for an EC Design Examination
Certifi cate (Cat IV assemblies only).
Where AMEC are deemed to be the manufacturer of the piping
systems, then under the PED/PER, AMEC have to create a
Declaration of Conformity, signed by the Project Manager.
Activities / Deliverables Description
1
2
3
Safety Case
Acceptance (HSE)
Certifying Authority
(CA) / Independent
Verifi cation Bodies
(IVB) Acceptance
Complete
Project As-Built
Documentation
Submit Safety Case to HSE & close out all queries /
correspondance prior to next stage of operations.
Close out all outstanding technical queries and obtain fi nal
Letter of Acceptance.
Complete as-builts of design drawings and deliverables in
accordance with Project / Client requirements.
Process,
Technical
Safety
Affected
Disciplines
Affected
Disciplines
PER Focal
point
Project
Manager
Key
Discipline
Technical
Safety
Technical
Safety
Affected
Disciplines
Supporting Documentation
SHE Audit Procedure OAG-X160-190-PRO-023
Management of Functional Safety, OAG-X160-
190-GDL-004
Formal HAZOP, OAG-X160-190-PRO-017
(previously AOD-92-022); Engineering & Design
Reviews, OAG-X160-190-PRO-013
Project Compliance with the Pressure
Equipment Directive, Document
No. OAG-X160-190-GDL-007.
Project Compliance with the Pressure
Equipment Directive, Document
No. OAG-X160-190-GDL-007.
To ensure all fi nal design deliverables are completed and that client and statutory obligations are
satisfactorily resolved.
Supporting Documentation
As Built Drawings and Documentation,
AOD-92-021