MID/AN/115

Extraction of whole pumping unit from its respective pit by way of dismantling, opening all internal and external 500 mm dia x 200mm dia x 70 mm dia. lengths of column assembly components in sequence alongwith connected fittings such as muff coupling. C.I. Guide spiders, top shaft, stuffing box , C.I. Bell mouth, enlarger, stainer 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.

Dismantling of bowl assembly by way of opening and extraction of 2 No. Bowl cases, 2 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 re-metalling 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, complete job.

Strengthening and reconditioning the AISI410-SS close type impeller by way of rebuilding of all worn out portions such as impeller wanes, bore hole and keyways by way of re-metalling 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. Complete job.

Providing of new cast/ fabricated and machined leaded bronze impeller bearing ring in reconditioned seat having proper clearances with the impeller.

Repair/ reconditioning the AISI 410-SS impeller shaft by way of rebuilding of all worn out and under size portions by way of re-metalling 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. Complete Job.

Complete assembling of the bowl assembly by way of mounting of two No. AISI 410-SS impellers on 85 mm dia. 2250mm long pump shaft with two 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. stainer to bowl assembly. Complete job all respects.

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 Rajal after repairs, unloading. Complete Job.

Assembling of each column one by one internal and external 500 mm dia x 200 mm dia x 70 mm dia in sequence and lowering in the respective pit along with assembled bowl assembly of 20 cusecs discharge VT pump. This includes fitting, lowering of line shafts, guide spiders, muff couplings, top shaft, tension tube,l deflector tube, joining of discharge surging head with delivery line 500 mm dia along with providing and fitting of relevant joining material, fire fly sheet, graphite packing grease packing, 19 mm size nuts, bolts, washers, fitting and tightening after complete alignment, leveling etc. Complete Job.

KHALSA ENGG. WORKS

TARSAIM ELECTRICAL WORKS