MID/AN/123

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 alongwith 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. 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.

Repair 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. Complete job.

Reconditioning of SS AISI-410 line shaft 70 mm dia, 2.15 mtr. long at worn out portions by way of rebuilding the worn out, undersize portions by remetalling with special SS 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. P/F of new fabricated AISI-410-SS cotter pins of line shaft. Complete job. (The material used for the SS shaft will be provided by the department presently lying at the sub-divisional store.)

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 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.

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.

Assembling of each column one by one with 70 mm shaft, 200mm internal tube and 500mm external pipe in sequence while lowering in the respective pit along with assembled bowl assembly. This includes fitting, lowering of line shafts, guide spiders, muff couplings, top shaft, tension tube, 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

M/S TRIKUTA ELECTRICAL AND MECHNICAL WORKS

BEE AAR ENTERPRISES