44/MID/AN

Strengthening, Replacement of various damaged components of Bowl and Column Assembly of 20 Cusecs discharge, 40 meters head, Jyoti make, 2 stage V.T Pump no 04 installed at L.I.S Rajal by way of Strengthening of Cast Iron bowl case by rebuilding the damaged worn out portions of internal and external surfaces of the bowl case by way of welding with specified Cast Iron welding electrodes, repair, reconditioning of elongated holes of flanged ends, machining, turning, finishing the main bore hole of bowl after reinstallation to bring it to the true size. Providing and fitting of new std. nitride compressed rubber bush lined leaded bronze discharge bush in main hole, locking of tight fitted bush with fine threaded copper studs s.s. lock plates and washers, finishing, grinding of external and internal surfaces of bowl cases with grinders along with facing the flanged ends, rebuilding, turning, finishing to true size the seat of impeller wearing ring. Also extraction of broken stud by drilling and rethreading of the holes. Complete Job.

Reconditioning of Cast Iron enlarger by way of rebuilding of worn out portions at external and internal housing by re-metalling with superior quality of welding electrodes and then finishing to true size after turning, machining, grinding, also rebuilding reconditioning of elongated holes of flanged ends to std. size. Also Providing and fitting of new std. size nitride compressed rubber bush in the main bore hole. Providing and Fitting of new studs of specified material. Complete Job.

Providing and fitting at site Cast Iron stiffener made up from guide spider suitable for pump shaft of size 70 mm dia. with six no. Holes of 24 mm dia .(as per the sample). Complete Job.

Rebuilding the AISI-410 S.S. closed type impeller by way of rebuilding of all worn out portions including its bore hole and key ways by re-metalling in layers with requisite S.S. welding electrodes and then machining, grinding, polishing, finishing of impeller to true size and specifications so as to fit on leaded bronze wearing ring with suitable clearance/allowance. The job including balancing of impeller statically and dynamically. Complete Job.

Reconditioning of Cast Iron Bell mouth by way of re-metalling the internal and external worn out surfaces, machining, turning and grinding to true size, facing, grinding of flanges to attain proper surfaces, reconditioning of elongated holes of flanged ends to std. size. Also rebuilding, turning and finishing to true size the seat of impellers wearing ring. Complete Job.

Fabrication and Fitting of new leaded bronze impeller wearing ring in rebuilt, reconditioned seat with having proper clearance allowance wearing ring. Complete Job.

Fabrication and providing at site top shaft sleeve of dia.70 mm made out of stainless steel A.I.S.I-410 grade ( as per sample.) also reconditioning of A.I.S.I-410 top shaft 2315 mm long X 70 mm dia by way & re-metalling the worn out undersize portions with special s.s. welding electrodes in layers and then turning, grinding, polishing, finishing to true size. Also removing checking eccentricity of top shaft with dial gauge at various off sets. Removing deflection eccentricity by heat treatment or on hydraulic press. Removing of deflection on heads/ends and then again checking the alignment of shaft on lathe machine. Providing and Fitting of new fabricated A.I.S.I-410-S.S. cotter pins along with reconditioning of key ways. Also rebuilding the threaded portion of the shaft and its nut with remetalling with S.S. welding electrodes, turning, finishing to true size and then rethreading the nut and the reqd. portion of the top shaft. Complete Job.

Strengthening / Reconditioning of M.S 500 mm dia, 2180 mm long column pipe by way of rebuilding the worn out / undersize portions at both ends of M.S flanges by re-metalling with superior quality welding electrodes and then turning, facing, grinding and alignment of repaired portion of the pipe to true size along with rebuilding, reconditioning of the elongated holes of the flanges wherever necessary, checking and removing ovality etc. complete job including handling charges. Complete Job.

Reconditioning of S.S A.I.S.I-410 line shaft 70 mm dia. x 2180 mm. long at worn out portions by way of rebuilding the worn out, undersize portions by re-metalling with special S.S welding electrodes in layers and then turning, grinding, polishing, finishing to true size and specifications including rebuilding, finishing of key ways to true size. Also removing & checking eccentricity of line shaft with dial gauge at various off sets. Removing deflection/eccentricity by heat treatment or on hydraulic press, removing of deflections on heads/ends and then again checking the alignment of the shaft on lathe machine. Providing and Fitting of new fabricated AISI-410-S.S line shaft cotter pins. Complete job.( as per sample)

Fabrication and providing at site C.I. guide spider set with three legs comprising of one no. guide spider suitable for line shaft of size 70 mm dia, three no.’s rubber pads and slotted C.S M12 x 20 mm screw, one no. rubber bearing, one no. cover for rubber bearing and bearing screws and washers (as per sample.) Complete Job.

Fabrication and providing at site Gun metal gland bracket having bore of dia.73 mm and with two nos through holes of 12 mm dia. on side webs to facilitate locking by H.T studs embedded inside the stuffing box ( as per sample.) Complete Job.

Strengthening /reconditioning of the cast iron motor & pump half coupling for bore size 70 mm and length 260 mm. Rebuilding the damaged, worn out portions by welding, turning & finishing/grinding and rebuilding the coupling’s bolt holes of dia. 16 mm, making keyways along with rebuilding of holes for Allen bolts. Fabrication of new cotter keys as per size and specification. Fabrication & fitting of intermediate spacer nut for pump and motor coupling including drilling of holes for coupling bolts with same P.C.D as per motor and pump half coupling. (as per sample ). Complete Job.

Fabrication and providing of A.I.S.I-410-S.S muff coupling of size of length 300 mm and bore size to suit line shaft of dia. 70mm along with its top and bottom split nuts and keyways. The machining should be done accurately for proper fitment and removal as and when desired during dismantling of column assembly. ( as per sample.) Complete Job.

Reconditioning of A.I.S.I-410-S.S. muff coupling along with its top and bottom nut by way of rebuilding at worn out portions by re-metalling with S.S. welding electrodes, turning, finishing to true size and rethreading the nuts and reqd. portions of cylinder with facing, turning all surfaces of nut and cylinder for proper fitment along with rebuilding of key ways. Complete Job.

Reconditioning of 200 mm dia. E.R.W shaft enclosing tube by cutting, removing from both ends of 200 mm dia. shaft enclosing flanges and fitting of new flanges similar size as specification to each end of the tube which should have 6 no of M 20 dia size threads, M.S welding to both ends of the flanges and then turning, facing both ends with respect of all over accurate thickness, straightening and alignment, facing of the tube. ( as per sample ) Complete Job.

Providing and Fitting at site of M24 x 120 mm high tensile steel bolts with washer and nut ( as per sample )

Providing and Fitting at site of M20 x 50 mm H.T steel bolt with washer and nut. ( as per sample )

Providing and Fitting at site of M22 x 50 mm H.T steel bolt with washers and nuts. ( as per sample )

Shifting, transportation (to & fro) of components of Bowl and Column assembly of Pump No. 04 to workshop for repair, reconditioning and from workshop to L.I.S. Rajal after repair, reconditioning. Job includes loading, unloading, labour charges for skilled and semi- skilled labour, handling charges at both ends and hire charges of truck as well as cost of fuel and lubricants used by the vehicle. Complete Job.

Complete assembling of bowl assembly by way of mounting of 2 Nos. impellers on 85 mm dia. 2.25 m long impeller shaft with 2 Nos. bowl cases, 1 No. enlarger 1 No. bell mouth, 1 No. stiffener in sequence at their respective places with key holding rings, back washers, suitable with required allowances of 2 Nos. impellers and co-eccentric in 2 Nos. leaded bronze wearing ring and lifting of M.S. strainer to bowl assembly of relevant F.F. sheet at each joint of bowl assembly with replacement of worn out/damaged holding rings. Complete Job.

Assembling of each column one by one internal and external 500 mm x 200 mm x 70 mm dia in sequence and lowering in the respective pit along with bowl assembly of 20 cusec discharge V.T pump no. 04. This includes fitting, lowering of the line shafts, guide spiders, muff couplings, top shaft, tension tube, deflected tube, jointing of discharge surging head with delivery line 500 mm dia. along with providing and fitting of relevant joining material, F.F sheet, graphite packing, grease packing 19 mm size nut, bolts, washers, fitting and tightening of complete alignment, leveling. Complete Job.

Testing of pumping unit which includes installation of 300 K.W, 400 H.P, 6.6 kV, V.T. Motor solid shaft B.H.E.L make H.T motor on the skirt and its alignment with respective pump half coupling, reconnection of dismantled cable connections of 6.6 kV, three phase to rotor, stator, commutative assembly, liquid rotor starter trifurcated sealing box and space heaters, cleaning of all carbon brushes, connecting of motor half coupling with pump half coupling, checking of all connections with proper alignments and adjustment. Testing of pumping unit for its proper operation. Complete Job.

Chargotra Trading Co.

R K Electrical and Engineering Works