NCTPSISEMII Circle AHP DnUnit III OH Works 202526 Overhauling of various sizes of valves cleaning checking and rubber lining the ash water lines cleaning of ash water tank and ash slurry Sump etc in Ash Handling Pump House

Amount

Remove the grills over the ash slurry sump of Unit-III and re-fixing the grills over the sump including consumables and T & P’s.

Providing bariguard in Unit-III slurry trench. Dewatering and removing the accumulated floating materials from the sump. Cleaning the sump and dispose the material collected from the sump and transporting to low lying area and dumped including consumables and T & P’s.

Dismantling, inspection and re-fixing the 406 dia bend with pipe in the suction pipe of ASDP A & B series, at (-) 10 mtr. Elevation including consumables and T & P’s.

Renewal of damaged anchored plates from the concrete wall for supporting structure inside the unit- III Slurry sump including consumables and T & P’s.

Renewal / Strengthening the supporting structure for suction bend and pipe and clamping inside the unit- III Slurry sump including consumables and T & P’s.

Removing 100 NB pipe from sump make up line to the end of suction pipe of A & B series cleaning the silt and sea growth chocked inside the pipe, cleaning the pipe inside the surfaces. Removing the peeled off rubber by burning cut the pipe in to two pieces cleaning the corroded pipe by buffing, grinding inside the pipe and welding and re-fixing one 100 NB Butterfly valve. Rubber lining the pipes including consumables and T & P’s.

Removal of 336 dia slurry line valve from the line, and reconditioning the worn out portion of valve body and gate including consumables and T & P’s.

Re-fixing in the 336 dia slurry line valve in the slurry line including consumables and T & P’s.

Removing the damaged 45 deg. Cast Basalt Bend and spool piece from the line. Applying basalt powder with paste at required damaged area of ASDP discharge side Cast Basalt bend and spool piece. Cut the damaged corroded flanges from the bend & pipe and machining the flange surface and weld the flanges at both ends of bend and pipe. Re-fixing the pipe & bend in the line and providing supporting structure including consumables and T & P’s.

Cleaning of Ash water tank (capacity 650 m3) of unit III, including removal of muds, sediments deposited at the tank bottom (at a height of 1.5 mtr.) and dispose the material through the tank drain pipe, collecting the sediments from the rain water trench and transporting to low lying area and dumping including consumables and T & P’s.

Cleaning & removing of barnacles formed inside the sea water storage tank walls of unit-II & III including consumables and T & P’s.

Removing the 350 NB valve from the Flushing Water Line and Ash water line and fixing the valve in the line after work completion and supports tightened including consumables and T & P’s.

Dismantling the valve body, bonnet assembly & gate and reconditioning the worn out portion of valve body and gate by metal filling and grinding and overhauling the 350 NB valve and assembling including consumables and T & P’s.

Removing the 350 dia Ash water discharge header pipe from the Unit–III line lowering to ground, cleaning the silt, sea growth chocked inside the pipe and checking the pipe inside surfaces including consumables and T & P’s.

Lifting, refixing the pipe in the Unit-III line and providing necessary supports (at above 4.5 mtr. Elevation) including consumables and T & P’s.

Removing the peeled off rubber by burning, cut the pipe in to two pieces grinding, inside the pipe welding the pipe and rubber lining the pipe (350mm M.S. Pipe) including consumables and T & P’s.

Rubber lining of fabricated sea water pipe line a. 350 mm MS Pipe = 20 m2 Cost of natural rubber b.300 mm Ms Pipe = 28 m2 Cost of rubber solution including consumables and T & P’s.

Removing the 300 dia Ash water discharge header pipe from the Unit-III line lowering to ground, cleaning the silt, sea growth chocked inside the pipe and checking the pipe inside surfaces including consumables and T & P’s.

Lifting, re-fixing the pipe in the Unit-III line and providing necessary supports. (at above 7 mtr. elevation) including consumables and T & P’s.

Removing the peeled off rubber by burning, cut the pipe in to two pieces grinding, inside the pipe welding the pipe and rubber lining the pipe (300mm M.S. Pipe) including consumables and T & P’s.

Dismantling the 200 dia suction side valve and Ash water strainer drain valve from the unit III line and overhauling and re-fixing the valve in the line including consumables and T & P’s.

Dismantling the 150 dia discharge valve from the Ash water line, overhauling and re-fixing the valve in the line including consumables and T & P’s.

Dismantling the 150 dia N.R. valve from the Ash water line and overhauling and re-fixing the valve in the line including consumables and T & P’s.

Renga Engineering Works India Pvt Ltd (BID ID -1485222)