NCTPS II 2 X 600 MW MI Circle Boiler Maintenance Division Unit II Overhauling of Boiler Main Steam Stop

Amount

Providing chain block arrangement, dismantling of electrical actuator and motor assembly of 550NB MSSV & E2 valve by loosening of all bolt and nuts. Dismantling of yoke assembly, of valve by loosening and releasing of heavy size -16 Nos HT bolt & nuts. using chain block arrangement lead, lift of material to 73mtr elevation of boiler including consumables, T&P's complete.

Dismantling of totally gland bolts and gland collar, bonnet clamp bolts, heavy size bonnet clamp,bonnet arresting split rings by using 7 ton capacity chain block arrangement, special heavy duty fixtures and 2 X 100 Tons capacity hydraulic jacks by lifting, lead, lift complete at 73mtr elevation of boiler including consumables,T&P's.

Dismantling of heavy size bonnet assembly with heavy size stem 100 mm Dia X 2 Mtr length with valve disc by using 7 ton capacity chain block arrangement, special heavy duty fixtures and 2 X 100 Tons capacity hydraulic jacks by lifting, lead, lift complete at 73mtr elevation of boiler including consumables,T&P's.

Overhauling and Rectification of MSSV & E2 internal parts, Lapping of seating surfaces of valve disc and seating ring with coarse particle lapping paste and fine particle lapping paste compound using lapping tool and surface plate, blue matching of valve disc and valve seat surfaces, repeating of lapping and blue matching process till achieving the perfect matching to ensure valve sealing by using 7 tons capacity chain block arrangement including consumables,T&P's, leading, lifting and assembling at 73mtr elevation of boiler.

Renewal and re-assembling of defective parts of bonnet assembly such as grafoil gland rings, supporting ring,grafoil gasket in the bonnet assembly before assembling the bonnet assembly in side the valve, including sheet cutting of bonnet and valve body maching surface area by grinding, buffing and filling etc., assembling at 73mtr elevation of boiler including cost of consumables, machining charges, T&P's, leading, lifting.

Reassembling of valve internals such as gland bolts, bonnet clamp bolts, bonnet assembly, SS valve stem (Ø100mm X 2 mtr), valve disc- having 450mm dia and heavy weight, of 550NB MSSV & E2 valve . using chain block arrangement after attending defects and aligning, matching, checking seating position including leading, lifting and assembling at 73mtr elevation of boiler, consumables,T&P's.

Re-assembling of yoke of 550NB MSSV & E2 valves by tightening of heavy size-18nos HT blolt & nuts. Re-assembling of electrical actuator and motor assembly of 450NB MSSV valve by tightening of all bolt and nuts using chain block arrangement and removing chain block arrangement including leading, lifting and assembling at 73mtr elevation of boiler, consumables,T&P's,

Commissioning of Rectified and assembled MSSV & E2 valves by manual operation of full open and full close and adjusting of gland packing tightness and adjusting valve stem upper and lower travel limit for calibration of limit switch level retightining of all bonnet bolts after conducting hydraulic test and again tightening after syncronising of unit at hot condition and lifting upto 73mtr elevation of boiler including consumbales with nessary T&P's, leading.

ferrofabs (BID ID -1071184)