MID/AN/96

Extraction of whole pumping unit from its respective pit by way of dismantling, opening all internal and external 500 mm dia x 200 mm dia x 70 mm dia lengths of column assembly components in sequence along with connected fittings such as muff coupling, C.I. Guide spiders, top shaft, stuffing box, C.I. Bell mouth, enlarger, strainer and bowl assembly lubrication system of column assembly one by one and stacking of each at pump house after checking and segregating of damaged defective parts of each. Complete job.

Transportation of the damaged Bowl assembly of the pumping unit from the site to workshop for repairs using manual labour, mechanical transport, mobile crane etc. Back shifting to site LIS Ranjan after repairs, unloading. Complete job.

Dismantling of bowl assembly by way of opening and extraction of 3no. Bowl cases, 3 No. stainless steel impellers from SS impeller ( pump ) shaft in sequence by removing / disengaging all nuts and bolts, lock rings, back plate of each bowl case with fabricated pullers, heavy duty tools and tackles without damaging of cast iron bowl and SS impeller. Proper stacking of each dismantled parts / components. Complete Job.

Rebuilding of C.I. Bowl case by way of welding, rebuilding the damaged worn out portions of internal as well external surfaces of the bowl case with specified welding C.I. electrodes. Job also involves repair, reconditioning of elongated holes of flanged ends, the pump shaft bore hole of bowl after remetalling and turning, finishing it to true size, providing and fitting of new casing studs, Nitrile compressed rubber lined leaded bronze discharge bush in the pump shaft collar groove, providing / fitting S.S. lock plates and washers, fine grinding of bowl case with pencil grinder, rebuilding, turning, finishing to size the seat of the impeller bearing ring in each bowl case and having suitable clearances. ( as per size and specification ) Complete job.

Repair / Reconditioning of AISI-410-SS impeller shaft by way of rebuilding of all worn out and under size portions by way of remetalling in layer with suitable SS welding electrodes, then turning, grinding, polishing and finishing of the impeller shaft to true size and specification. Also straightening and aligning the shaft on hydraulic press, removing of deflections at ends and checking the shaft’s alignment on lathe machine, providing & fitting of new cotter pins/ keys of AISI-410-SS for its proper fitment. ( as per size and specification) Complete job.

Repair / Reconditioning of AISI-410-SS close type impeller by way of rebuilding of all worn out portions such as impeller wanes, bore hole and keyways by way of remetalling in layers with suitable SS welding electrodes, then machining, turning, grinding, polishing and finishing of the impeller to true/standard size and specification so as to fit on leaded bronze bearing ring with suitable clearance. The job includes balancing of impeller statically and dynamically. ( as per size and specification) Complete job.

Providing of new cast / fabricated and machined leaded bronze impeller wearing ring in reconditioned seat having proper clearances with the impeller. ( as per size and specification)

Repair of MS Strainer by way of welding of MS machined top flange having 14 nos M24 threaded holes (for adaptability & fitment to main Bowl assembly ),duly provided with welded mesh for restriction of floating / suspended trash. Providing of 14 nos HT bolts of size M24 along with the strainer. Complete job

Complete assembling of the bowl assembly by way of mounting of three no’s AISI-410-SS impellers on 85 mm dia., 2850 mm long pump shaft with three no. bowl cases, one no. enlarger, one no. bell mouth, one no. stiffener in sequences at their respective places with key holding rings, back washers suitable with required allowances. Re-connecting of M.S. strainer to bowl assembly. Complete job in all respects.

Testing of pumping unit which includes installation of 485 KW, 650 HP, 6.6 KV VT motor solid shaft BHEL make HT motor on the skirt and its alignment with respective pump half coupling, reconnection of dismantled cable connections of 6.6 KV, 3 phase to rotor, stator, slipring assembly, liquid rotor starter trifurcated sealing box and space heater, cleaning of all carbon brushes, connecting of motor half coupling with pump half coupling, checking all connections with proper alignments and adjustment and testing of pumping unit for its proper operation

HITECH MECHNICALS

GEETA ENGINEERING MECH WORKS