Overhauling of Hydraulic Sluice Valves of DCI DREDGE XVII

Amount

Overhauling of Hydraulic sluice valves. Detailed scope is attached here with, along with Annexure-1 Contractor should be in a position to mobilise and start the work within 2 days. Contractor havifng valid experience in execution of similar works will only be considered. Required tools viz., load tested chain blocks, lifting belts, slings, measuring instruments (calibrated) are to be arranged by contractor. The contractor shall have to engage men on round the clock basis and also on sundays and holidays.

a) Valve to be removed from place and taken to workshop after disconnecting from all necessary pipes including dredge pipes. Valve to be dismantled and nose and buffer rings removed. Valve body in a way of nose and buffer rings to be calibrated and report submitted. If the valve body in way of these rings are worn out same are to be metal built up and machine various diameters to original dimension. Valve slide to inspect and dress-up. Valve slide guides to inspect, measure the gap, renew the guide bars in order to adjust the clearance. Water boxes to be pressure tested to 5.0 bar. Water box to be scraped and cleaned and painted with Apexior paint. Valve slide and spindle to be dismantled. Indicator spindle to be checked for trueness and mechanism to be overhauled. Damaged valve slides to be renewed with ship supplied slides. Water gland seal for valve spindle to be repaired/renewed. Flushing water space to be cleaned and painted with Apexior. All conusumables like electrodes for metal builtup , bolts and nuts of HT grade 13.9 only to be used with test certificates,gaskets of pure neoprene rubber joints ,etc are under contractors scope.Cost inclusive of all spares.

b) Nose & buffer rings(ship supply) to be renewed. Removing hydrulic cylinder from valve, renewal of piston seals & gland seals and fitting back cylinder on the valve and valve assembled back with yard supply packings. Valve to be pressure tested and tried out hydraulically by hand pump to the satisfaction of ship staff. Valve body to be chipped and painted with one coat each of epoxy primer and enamel green. Valve to be taken on board and refitted in place with new yard supply joints. Valve to be shown in working condition. All pipelines to be assembled back and any leakages from pipelines to be rectified. Valve to be shown in working condition.

i) 600 mm ( to be overhauled as per a & b of above)

ii) 700 mm( to be overhauled as per a & b of above)

iii) 800 mm( to be overhauled as per a & b of above)

c) Worn out portion in way of seat/nose and buffer rings to be built up by low hydrogen electrodes to required diameter and machined to original dimensions. Rate should be inclusive of cost of electrodes & machining.All conusumables like electrodes for metal builtup , bolts and nuts of HT grade 13.9 only to be used with test certificates,gaskets of pure neoprene rubber joints ,etc are under contractors scope.Cost inclusive of all spares. d) Worn out/thinned down portions of water box valve body to be cropped and renewed.

d) Renewing the indicator unit (MS).Fabrication of indicator units as per sample is under vendor scope.

e) Fabricating, fitting by welding the MS guide plates – approx. size 230x80x20 – 4 Nos. to guide the valve slide to each valve.

KALATHIL BROTHERS CONSTRUCTION CO. PVT. LTD.

VOYAGER MARINE SERVICES INDIA PRIVATE LIMITED