Volume-IF - JantERmantER

TITLE SPECIFICATION NO. PES-509-02A
LIGHTNING PROTECTION &EARTHING
OF CHIMNEY
(SUPPLY & INSTALLATION)
VOLUME
II B
SECTION
D
REV NO. 0 DATE 08.02.2002
SHEET 3 OF 4
3.14 The com plete lightning protection system arrangem ent including air-term inations,
conductors, connections, fittings etc. and m aterials located on the exterior within 10m
from the top of the chimney shall have lead coating of 2.0mm thickness.
3.15 All exposed m etal structures such as ha nd rails, platform s, ladders/stairs shall be
connected to the downconductors through earthing band rings, of 50x6m m GI strip
located 2000mm above each platform . Ladders and platforms shall be bonded together
for electrical continuity. A strip of 25x3 mm GI shall be used for connection between
equipment and earthing band rings. Similarly, all lighting fixtures shall be earthed.
3.16 Temporary lightning protection system shall have to be provided and m aintained during
the construction of chimney or till f inal lightning protection system is installed by the
contractor free of cost and in line with IS:4998(Part-I).
3.17 For general reference and guidance, Below Ground Earthing Typical Details drg.no.
PE-DG-XXX-509-0004 & drg.no.PE-DG-XXX-509-003 may be used.
4.0 GALVANISING
4.1 All steel strips and m aterials requiring ga lvanisation shall be hot-dip galvanised
according the IS:2629 & IS:4759. Galvanising shall be done at a place where
galvanising and testing facilities conforming to the relevant Indian Standards exist. The
galvanising shall be sm ooth, clean, uniform , continuous & free from acid spots. The
thickness of zinc deposit at any spot shall not be less than 75 m icrons. The purchaser
reserves the right to m easure the thickness of zinc deposit and reject any com ponent
which shows thickness of zinc at any loca tion less than 75 m icrons. Should the
galvanising of the sample be found defective, the entire batch of the steel will have to be
re-galvanised at the seller’s cost.
4.2 All nuts, bolts and washers, wherever used, shall be cadmium coated or zinc passivated,
the thickness of plating conforming to the relevant Indian Standards.
5.0 INSPECTION & TESTING
5.1 The following stages of manufacture/installation shall be stage inspected by purchaser or
his duly authorised representative:
5.1.1 Inspection of all material such as vertical ai r terminals, steel strips, electrodes, test links
including hardware items such as bolts, nuts etc.
5.1.2 Inspection of m anufacturing processes su ch as shearing, punching, beinding, welding,
galvanising, painting etc.
5.1.3 Inspection of installation procedures
The actual inspection will be carried out as per the agreed Quality Plan.
5.2 TESTING
5.2.1 The supplier shall perform all tests nece ssary to ensure that the m aterial and
workmanship conform to relevant standard s and that such tests are adequate to