O and M of Gumma Power House

O&M of Gumma Power House

Repair of thrust collar (Mirror disc) of turbine shaft by welding machining then grinding and maintained thickness of the mirror disc of collar exactly as per drawing and should be 15 mm. The distance from collar to collar of the shaft should be 160.40 mm. Repair of stainless steel sleeve ( where shaft seal is fixed ) by proving minor cut with the help of lathe machine to remove the ups and down on the surface of stainless steel sleeve .

Re-babiting of Thrust bearing with white meatal Confirming to IS25 Grade 84 consists of following specification of works:- a) To clean bearing housing b) To record dimension and to note detail of oil packets and galleries. c) To remove oil fatigued and damaged metal layer under controlled temperature to avoid distortion of base metal . d) To carry out proper cleaning of base metal follower by DPT to ensure defect free surface. e) Tinning of base metal with required flux and graded tin. f) To reline with IS25 grade -84white metal for required thickness 10 to 12 mm. g) To carry out to machining of lining. h) UT Test to be carry out to ensure proper bonding. i) Thickness of white metal should not be less than 3.5 mm j) Final matching and finishing to maintain size ID 160 mm k) Certificate regarding material chemistry and ultrasonic test to provide by the contractor

Re-babiting of 20 Nos. Thrust Pads:- i) Removal of old damaged babit material from the shell. ii) Re-babiting of Thrust Pads. iii) Pouring of white metal after maintaining the temperature of 3500 to 4000 of white metal iv) Casting of shell with white metal of IS 25 Gr. 84 composition v) Thickness of white metal should be 3 mm to 5 mm. vi) Turning machining chipping so as to standard dimensions and finally U.T./D.P. test is to be conducted on the thrust padsso that there should not be any defect in the pads. Tapered washer along with lock must be provided in spare for all the thrust pads washer and lock should be high quality