Overhauling And Reconditioning Of Condenser Cooling Water Inlet Valves Of Size Ø2000 Mm And Renewal Of A1 Condenser Inlet Valve’S Internal Ss Valve Seating Ring With New Fasteners Including Surface Preparation, Blue Matching, Drilling, Tapping And Weld, Thiruvallur-Tamil Nadu
TDR : 33088891
Tender Notice
BOQ
Expired
Thiruvallur
Tamil Nadu
Overhauling And Reconditioning Of Condenser Cooling Water Inlet Valves Of Size Ø2000 Mm And Renewal Of A1 Condenser Inlet Valve’S Internal Ss Valve Seating Ring With New Fasteners Including Surface Preparation, Blue Matching, Drilling, Tapping And Weld
Name of Work:NCTPS –II - M-II Circle – TM Division – S.Dn III - Unit-I – Overhauling and reconditioning of condenser cooling water inlet valves of size Ø2000 mm and renewal of A1 condenser inlet valve’s internal SS valve seating ring with new fasteners including surface preparation, blue matching, drilling, tapping and welding of SS valve seat with valve base metal at inside the condenser cooling water inlet pipeline at ‘-3’ meter elevation in condenser pit in Unit-I during the annual overhaul period of 2022-23.
Sl. No.
Item Description
1
Opening of permanent grill platform provided over the Condenser inlet Butterfly valves by gas cutting to facilitate to attend works in condenser inlet valve.
2
Providing temporary scaffolding platform arrangement at \"-3\" mtr elevation at condenser pit around the 2000 mm dia inlet butterfly valve to access and attend reconditioning work of butterfly valve.
3
Cleaning the sea water derbis accumulated in the pipelines and it inner wall completerly upto 10 meter distance from the Butterfly valve.
4
Entering into Condenser inlet pipe line through debris filter’s 500 mm manhole door, and inspection of 2000 mm condenser inlet isolation butterfly valve provided between debris filter and condenser inlet pipe line, mechanical cleaning of butterfly valve’s internals and 2000 mm pipe line’s out surface by scrubbing and buffing to attend works.
5
Removing of existing damaged valve door rubber seal by removing 48 Nos SS locking strips & 96 nos locking studs and nuts, including removing of broken studs by welding of long bolts with broken studs section with 10mm drill, gas heating, drilling at the centre of the broken stud’s section and removing the studs at inside the 2000mm diabutterfly valve.
6
Inserting of new SS valve seat in to the valve body through the manhole door of 2000 mm dia pipe line, metal filling by TIG welding at pitted base metal inner surface of the valve matching with SS seat , Grinding and buffing of valve seat matching surface to ensure the perfect fitment, blue matching of metal builed inner surface of valve with new SS valve seat and repeat the same to achieve the proper fitting.
7
Welding the complete circumference (6280 mm) of the NB 2000 dia ASTM A240 SS 316L Valve seat with ASTM A439 D2 Casting valve body by using special type welding electrode.
8
TIG welding of SS valve seat and valve body at equal distance to provide additional support for the SS valve seat ring.
9
Reassembling of new valve door rubber seal by providing new SS locking strips 48 Nos & 96 Nos SS locking studs and nuts.
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