AHP Unit I O H Works 2023 24 Overhauling of various sizes of valves cleaning checking and rubber lining the ash water lines cleaning

Amount

Remove the grills over the ash slurry sump of Unit I and re-fixing the grills over the sump

Providing bariguard in Unit-I 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.

Dismantling, inspection and re-fixing the 406 dia bend with pipe in the suction pipe of ASDP A & B series, at (-) 10 mtr. Elevation.

Renewal of damaged anchored plates from the concrete wall for supporting structure inside the unit- I Slurry sump.

Renewal / Strengthening the supporting structure for suction bend and pipe and clamping inside the unit- I Slurry sump.

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.

Removal of 336 dia slurry line valve from the line, and reconditioning the worn out portion of valve body and gate.

Re-fixing in the 336 dia slurry line valve in the slurry line.

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.

Cleaning of Ash water tank (capacity 650 m3) of unit I, 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.

Cleaning & removing of barnacles formed inside the sea water storage tank walls of unit-I.

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.

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.

Removing the 350 dia Ash water discharge header pipe from the Unit–I line lowering to ground, cleaning the silt, sea growth chocked inside the pipe and checking the pipe inside surfaces.

Lifting, refixing the pipe in the unit-I line and providing necessary supports (at above 4.5 mtr. Elevation)

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).

Rubber lining of fabricated sea water pipe line. 1)350mm MS pipe=20M2 1)350mm MS pipe=28M2

Removing the 300 dia Ash water discharge header pipe from the Unit-I line lowering to ground, cleaning the silt, sea growth chocked inside the pipe and checking the pipe inside surfaces.

Lifting, re-fixing the pipe in the unit I line and providing necessary supports. (at above 7 mtr. elevation)

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)

Dismantling the 200 dia suction side valve and Ash water strainer drain valve from the unit I line and overhauling and re-fixing the valve in the line.

Dismantling the 150 dia discharge valve from the Ash water line, overhauling and re-fixing the valve in the line.

Dismantling the 150 dia N.R. valve from the Ash water line and overhauling and re-fixing the valve in the line.

A. ANANTHAN