REPAIR/REPLACEMENT OF PRESSURE RELIEF VALVES AT NAVAL DOCKYARD VISAKHAPATNAM UNDER GE (I) (DM) VISAKHAPATNAM

Amount

Material & labour for Cleaning, removing of existing corroded cover plate and its angular frame embedded in dry dock floor, removing accumulated mud/debris inside pit of size not exceeding 900x900x600mm, disconnecting non-functional 100mm dia pressure relief valve by unscrewing or cutting bolts & nuts, chipping and cleaning 100mm dia Stainless steel Gr 316 existing perforated pipe embedded throughout dock floor thickness and further inserted in the filter media level (pipe cleaning, removing, extracting gravel, silt and debris shall be carried-out throughout inside pipe not exceeding 200mm and projected pipe area in the vale pit carefully by using any means such as mechanical tools, air compressrors etc), cutting the existing 100mm dia pipe including flange leaving 50mm length form the floor level in the pit, making 30mm groove to depth of 75mm all around the pipe and filling M-seal in groove ensuring leak/seepage around the pipe. Supply, fabricate 80mm dia not exceeding 2000mm (to suit existing cleaned 100mm pipe) perforated stainless steel Gr 316 pipe and inserting into existing 100mm pipe to the extent and match with existing old pipe and filling circular

gap between pipes by using M-seal, providing 80mm end flange 20mm thick made out stainless steel Gr. 316 and welding on 80mm pipe. Supply and fixing 80 mm dia non-return both end flanged vlave as per IS 1538, working pressure 3000 psi Body IS 318 Gr LTB2, Disc IS 210 FG-200 alongwith pressure relief valve ASTMA216 Gr WCB, disc material stainless Gr 316. Providing, fixing and welding MS angular frame of pit size made out of ISA 75X75X8 along with 8mm hinged chequered cover plate. Frame shall be welded to existing reinforced rod exposed around the pit and grouted by using GP2 FOSROC Cement complete all as specified and as directed.

Note : 1. Safety precautions shall be taken care while execution because of ground pressure from filter media may rush through pipe while cleaning inside pipe. 2. MS angular frame and cover plate to be fabricated as per the site condition as the Pit sizes may varies at places. 3. Work shall be carried out only at dry dock and every pit should be completed 100% before docking of vessel 4. All the above work are deemed to be included in the quote rated.

M/s Sai Venkata Durga Constructions

PRATIMA ENGINEERING WORKS

P VENKATAPATHI RAJU

REAL ENGINEERING WORKS