BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

(7) PaintPrior to delivery after shop inspection, the whole of the steelwork shall beprepared for painting by an approved blast cleaning method.All rust, grease, mill scale and harmful matter shall be removed. The surface shallbe blast cleaned to:-a. Swedish Standard Sa 2 1/2 SIS OS 5900 1967b. British Standard 4232 Second Qualityc. U.S.A. Standard commercial blast finishSSPC-SP-6-63The first coat of primer of recommended by the manufacturer as suitable for useunder the prevailing condition at the application site shall be applied immediatelyafter blast cleaning (or within two hours).No paint shall be applied to the surfaces to be embedded in concrete, to contactsurfaces for joints using high strength friction bolts and to surfaces within 50 mmeither side of joints to be welded.Painting shall be carried out in a clean, dry building where air temperature shallnot be allowed to drop below 5 deg.C. No paint shall be applied on the steelworkwith condensation. Painting shall not be carried out when the relative humidity isover 90%, or if in the open, during rain, fog or mist. The welded areas and theedges of site joints shall be cleaned down, primed and painted' all in accordancewith the standards specified, after erection.Each coat of the paint will be applied in different colour. When paintwork isdamages it shall be cleaned and re-painted following the procedures as approvedby the Board. The manufacturer's instructions regarding inter-coat intervals shallbe strictly observed.(8) Transportation and Storage of SteelworkThe whole of the steelwork shall be handled in such a manner that the shape andsurfaces of the section shall not be damaged during lifting and transportation. TheContractor shall take all necessary measures, to ensure that steelwork membersshall be handled, stored and erected without their being subject to stresses inexcess of those for which they were designed. Chains and hooks will not be usedin contact with the steel work and lifting slings shall be of nylon rope. Steel workshall be stored in clean, dry conditions off the ground. Separate pieces ofsteelwork shall have spacer blocks between them.(9) ErectionThe Contractor shall ensure the correctness of alignment, plumbing and stabilityof the various frames and members. He shall also take all necessary measures, byadequate resistance to wind and stability against collapse, during construction.No permanent bolting and site welding shall be carried out until proper alignmenthas been obtained.Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)198