Re babbiting of thrust pads

Dismantling of draft tube, top and bottom cover, runner, spiral case, shaft seal, shaft, back pressure pipe etc.

Centrifugal re-babbiting of thrust pads of thrust cum Guide bearing. The job will consists of following works as detailed below:- (1) Removal of old damaged Babbitt material from the shell. (2) To remove oil fatigued and damaged metal layer under controlled temperature to avoid distortion of base metal. (3) Tinning of base metal with required flux and graded tin. (4) Providing and fixing of rubber O rings for thrust pads . (5) To reline with IS 25 Grade-84 white metal for required thickness 3 to 5 mm . (6) To carryout to machining of lining (7) UT Test to be carried out to ensure proper bonding . thickness of white metal should not be less than 3.5 mm

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 sleeve.

Centrifugal re-babbiting of thrust cum Gudie bearing with white metal 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-assembling of dismantled parts i.e. draft tube, top and bottom cover, runner, spiral case, shaft seal, shaft, back pressure pipe etc. Fixing of Thrust pads in thrust bearing housing with blue matching placing bearing in its housing then covering and make sure the temperature of thrust bearing should be in permissible limit as per manual .

Packing of damaged equipment, loading, unloading and transit insurance of material from site (Gumma Power House) to contractor's workshop and back to Gumma Power House

Re-alignment and rebalancing of whole turbine, checking the vibration analysis of Machine-1 as per OEM norms with testing and commissioning of unit -1 complete in all respect. Providing six months free maintenance in case of temperature rise of thrust bearing, thrust bearings pads damaging, any water leakage from inside turbine and ensuring satisfactorily running of machine on full load 1.50 MW.