Biennial Contract for Routine/preventive/breakdown maintenance of flushing apparatus of Eco ash Pan system and Insulation work over the heating surface of boiler paths steam/feed water/drainpipe lines, IBD tank, boiler drum, APH, and duct

Amount

Round the clock Preventive maintenance of all the flushing apparatus of economizer ash pan system, removal of choking, their regular cleaning and disposal of ash in three shifts (each shift consists of 08hrs) of unit No. 5&6,2x250 MW a) Regular hammering of economizer ash pan transition pipes to avoid choking of economizer hopper. b) In case of choking of hoppers ash gate to be closed transition pipes to be dismantled and ash / foreign materials to be removed through the discharge pipe and flushing apparatus. c) After removal of choking transition pipes to be fixed in position, gaskets of proper size to be provided and bolts to be tightened ensuring no leakage of ash. d) Removal of foreign materials at regular interval from the flushing apparatus to avoid choking /overflow e) Replacement of foreign flange gasket of flushing water line of economizer ash pan system, after isolation of the system in case of water leakage from the flange /pipeline. f) Greasing of Pad liners of expansion piece of flushing apparatus. g) Opening of ash gates to be regulated to maintain controlled ash flow from the flushing apparatus at the time of soot blowing of pressure parts of main boiler.

Removal of choking of interconnecting of ash /slurry pipe from ash pan to central disposal pipeline up to bottom ash hopper of economizer hopper ash pan system

Servicing/replacement of plate valve of economizer ash pan system

Repairing of eroded section of economizer ash pan system /pipeline by removal of worn-out portion and providing patch of 6-10mm thick MS plate.

Servicing of butterfly valve/ flushing water nozzles/ replacement of (1″/2″) size valve of economizer ash pan system.

Removal, disposal and cleaning of ash/slurry, foreign materials accumulated due to overflow of economizer ash disposal system from the following places of boiler and cleaning the area by compressed air. a) Top of the hot secondary interconnecting duct. b) Complete platform at economizer ash hopper area. c) Complete platform below economizer ash hopper area/duct across guide bearing area of section APH.

Supply and fixing of 65mm thick LRB insulation pad in single layer

Supply and fixing of 65 mm thick LRB insulation pad in double layer

Supply and fixing of 65 mm thick LRB insulation pad in triple layer

Supply and fixing of G.P. sheet 22 SWG (0.71 mm Thick)

Removing the old webbed G.C. sheet / G.P. sheet /Aluminium sheet and fixing the same on LRB Pads with self-tapped screws.

U.S.Enterprises