Repair ,testing and commissioning of 1No. of VT Pump including fabrication of different parts of cooling water system of 3x40MW SVP Bhaba Power House. under Electrical Maintenance division HPSEBL, Bhabanagar.

Repair/replacement of different parts of 7 stage impeller as follow:- ** Repair eroded/damaged impellers by means of brazzing and buffing and grinding to its original profile. ** Replacement of damaged gunmetal bushes and mac-ring of each stage of impeller. ** Removing of all the corroded layer of impeller by means of buffing therefer after applying the epoxy paint on impeller complete body.

Fabrication of impeller shaft of SS 410 help of turning, machining as per following dimensional (as per sample):- ** Dia = 40mm. ** Length = 2.5 meter long. ** Balancing the same. ** The shaft should be straight without any bend/tapper part. Surface of Shaft should be machined properly. ** One side of shaft will have Anti-clockwise threads upto an lengh of 75 mm. (** NOTE:- Threads must be clear without ant play and should match the socket**) ** Material SS 410.

Providing and replacement of impeller SS HT studs MI6x70 mm (with nut and spring washer) and 20 nos impeller bolts MI6x85 mm.

Providing and replacement of column pipe HT SS M12x70 mm bolt & nut with spring washer.

Providing and replacement of all damaged strainer nuts, bolt & spring washers with new one of SS material.

Providing and Fabrication plan bush of gun metal/phosphor bronze having following specification:- ** OD= 83mm. ** ID =50.5 mm. ** 2 Nos. V-shape groove inside of ID for lubrication. ** Length = 120 mm long and anticlock wise threads in 120 mm.(Thread size as per sample). ** Collar for wranch grip on both side of bush having size OD= 70 mm, height =12mm of thread. ** The total length of bush including collar is 144mm. (As per sample). ** NOTE:- Threads must be clear without ant play and should match the inclusive tube (Sleeves).

Providing and Fabrication Collar Bush of gun metal/phosphor bronze having folloring specification:- ** OD= 83mm on top. ** OD= 82mm on discharge case side. ** ID = 48.5 mm on discharge case side. ** Length = 130 mm long including center collar. ** 2 Nos. V-shape groove inside of ID for lubrication. ** A collar for wranch grip on top side of bush having size OD= 65 mm, height =12 mm. ** A collar in center of bush having OD= 95 mm, width= 10 mm. ** The anti-clock wise threads should be 60 mm from both side center collar. ** The total length of bush including top collar is 144mm. (As per sample). ** NOTE:- Threads must be clear without ant play and should match the parts.

Providing and fabrication Gland Cup having of SS 410 material:- ** Flange O.D = 198mm and 8 Nos. hole in flange for stud M10x30. ** Gland Cup will be Anti-clock threaded from non-flange end side from ID. ** The threads of gland cup should match the 475 mm long inculsive tube (small sleeve). ** There should not be any mismatch and play in the threads. A new groove for O-ring in Gland Cup will be . NOTE:- Sample of the same is also given to contractor.

Providing and fabrication of SS 410 material Gland pressing nut with Gunmetal Bush:- ** OD= 111 mm. ** ID=89 mm. ** Top side will be nut having size=78 mm. ** Gunmetal bush fittied in nut as per sample having ID 48 mm. NOTE:- Sample of the same is also given to contractor.

Fabrication of Locking ring for gland Cup of SS 410 material:- ** ID = 89 mm (Must match threads of 475 mm long top sleeve). ** OD =108 mm. ** Width 20 mm. ** Holes for tighting at a gap of 40 mm in periphery of locking ring. NOTE:- Sample of the same is also given to contractor.

Fabrication of Shaft enclosing tubes/Sleeves (seamless) having following specification:- ** OD= 89mm. ** ID = 83 mm. ** length = 1500 mm. ** Thickness = 6 mm. ** The inner Anti-clock threads should be in a range of 75 mm. ** Should have inner Anti clock wise threading wirth thread picth of 2mm at both ends suiting to outer dimensions to hold the line shaft collar and plain bush) made of steel as per IS: 1239 IS: 1978.

Fabrication of Discharge Case tubes/Sleeves (seamless) having following specification:- ** Length = 266 mm. ** Thickness = 6mm. ** ID = 83 mm ** OD = 89 mm. ** Internal Anti-clock wise threads at both ends of thread pitch 2mm, length of thread picth is 75 mm at both ends or as per sample whichever is larger. ** One side of tube must match collar bush and other side will match Plan Bush.

Fabrication of Gland Cup tubes/Sleeves (seamless) having following specification:- ** Length = 475 mm. ** Thickness = 6mm. ** ID = 83 mm ** OD = 89 mm. ** Internal Anti-clock wise threads at one ends of thread pitch 2mm, length of thread picth is 75 mm at both ends or as per sample whichever is larger. ** Anti clock wise threads on outer side to a length of threads is 200 mm. ** One side of tube must match Gland Cup's inner threads and other side will match Plan Bush.

Fabrication of Line shafts of SS:410 material:- ** Length = 1500 mm. ** Dia. 50mm. ** Suitable Anti threading is to be provided at both ends upto a length of 70 mm with thread picth of 3mm or as per sample. ** Cut is to provided just near the threads at both ends to hold the shaft with pipe wrench.

Fabrication of Small shafts of SS:410 material:- ** Length = 485 mm. ** Dia. 50mm. ** Suitable Anti threading is to be provided at both ends upto a length of 70 mm with thread picth of 3mm or as per sample. ** Cut is to provided just near the threads at both ends to hold the shaft with pipe wrench.

Fabrication of motor shafts of SS:410 material:- ** Length = 1310 mm. ** Dia. 50mm. ** Suitable Anti threading is to be provided at both ends upto a length of 70 mm with thread picth of 3mm or as per sample. ** Cut is to provided just near the threads at one ends to hold the shaft with pipe wrench and at other end groove for Locking Key of dimensional 15 mm wide, 6 mm deep and 145 mm long from top of shaft.

Fabrication of Shaft Socket SS:410 :- ** OD = 60 mm. ** ID = 50 mm. ** Thickness = 10 mm. ** Lenght = 120 mm. ** Pin hole of 5 mm dia in center of Socket. ** Inner Anti clock wise threading for a length of 120 mm. ** The threads of Socket must match Line shaft and No PLAY should be there.

Fabrication of Shaft Socket of pump SS:410 :- ** OD = 60 mm. ** ID = 50 mm from one end. ** ID = 47.5 mm from other end. ** Thickness = 10 mm. ** Lenght = 120 mm. ** Pin hole of 5 mm dia in center of Socket. ** Inner Anti clock wise threading for a length of 120 mm. ** The threads of Socket must match Line shaft from onr end and sould match the threaads of impeller shaft at other end. No PLAY should be there.

Fabrication of cone shaped SS filter(as per sample) to block the enterance of rags/ pieces of woods into the pump, and further avoid the choking of stainers and stator coolers. (as per sample)

Fabrication of casted centring ring along with rubber sheet in shaft to balance the pump rotation and clip to hold the rubber sheet. (as per sample.)

Providing and fabrication of lubrication nipple. (as per sample).

Fabrication of Bearing coupling sleeves for pump motor. (as per sample)

Fabrication of discharge case base of dischage case should match the impeller nut holes. The threads of discharge case shold match the collar bush threads.

Fabrication of Suction Case With Cap (as per sample).

Installation of 12 mm Gland Doory for discharge case and gland Cup.

In addition to above if any other part is found damaged while carrying out repair of VT pump is to be replaced with new one by the firm/Contractor without any extra cost. ** Finally commissioning and testing of pump at factory. - Alignment and complete assembly of pump along with impeller at factory as per the entire satisfaction of EIC. (inspection to be carried by EIC), after that dispatch clearenace will be given. - Test certificate of material must be given at the time of inspection. - After fabrication, inspection and testing of pump asssembly at factory. The pump will be dispatched to Bhaba HEP after dispatch clerance)

Please Enable Macros to View BoQ information