Name of Work:Supply, Installation, Testing & Commissioning of Earth Pits and Earth Strips at various Oil storage tanks at ONGC, Uran
Sl. No.
Item Description
1
Supplying & erecting earth pit of minimum boredia.150mm size approved make Earthing Electrode consisting Pipe-in-Pipe Technology as per IS 3043-1987 made of corrosion free G.I. Pipes having Outer pipe dia of 50mm having 80-200 Micron galvanizing, Inner pipe dia of 25 mm having 200-250 Micron galvanizing, connection terminal dia of 12mm with constant ohmic value surrounded by highly conductive compound with high charge dissipation suitable for following type of applications:For Electrical Installation covering Transformer Neutrals, Lightning arrester Earthing, A.C. Plant & Sensitive Computer System(like Automation, SCADA) i.e independent Earthing in normal soil.-Length of Pipe : 3.00 mtrs -Back filling Compound :2 nos Bags of 25 Kg.chamber, Marker Post, Pit Cover as required and as per specification
2
Supply & laying of earthing strip (GI 50 mm × 6 mm ) from earth pit to tank shell and interconnection between pits
3
Welding, bolting, and termination of earthing strip to tank shell with proper lugs, nuts, bolts, and anticorrosive treatment
4
Measurement & testing of earth resistance for each pit and submission of test report to ONGC
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