MID/AN/109

1.Dismounting of 485 kW, 650 HP BHEL Make HT motor from its place of installation by way of disengaging all its three phase cable connections of rotor, stator, commutator assembly, trifurcated sealing box, etc. Opening & disengaging coupling set (Motor half coupling & Pump half coupling) of Unit, separating motor from motor skirt by opening all its nuts & bolts and placing motor on steel fabricated stool properly. Complete job.01Job 2.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. 01 Job 3.Transportation charges for shifting of worn-out items from LIS Ranjan to workshop and back shifting to site of installation after strengthening / reconditioning involving manual loading, mechanical transportation and handling charges. Complete job.01 job 4.Reconditioning of SS AISI-410-line shaft 70 mm dia. 2.15 mtrs. 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. 03 jobs 5.Repairing of the CI stuffing boxes of 20 cusec VT pumps installed at LIS Ranjan by way of shifting the same to workshop, extraction of the damaged CI sleeve, re-welding of all corroded surfaces with suitable CI welding electrodes, providing machining of new CI sleeve of appropriate size inside the stuffing box neck for retention of the rubber bearing bush, gland packing. Also providing fitting of new rubber bearing bush, MS locking plate along with suitable bolts. onto the bottom of the stuffing box. Removal of the broken gland bracket holding studs from the stuffing box surface, re-threading & fitting of new studs of required size Complete job01jobs 6.Repair/reconditioning of AISI-410-SS muff coupling along with its top & bottom nuts by way of rebuilding at old worn-out portions with re-metalling with special SS welding electrodes, then turning, finishing to true required size and rethreading both the nuts and required portion of the coupling, finishing of all the surfaces of nuts and muff coupling for proper fitment along with rebuilding of key ways. Complete job. 02 jobs 7.Strengthening/Reconditioning of column assembly components by Fabrication of C.I. guide spider set with three legs complete comprising of one no. guide spider suitable for line shaft of size 70mm dia. three no.’s rubber pads and slotted CS M12 x 20mm screw, one no. rubber bearing, one no. cover for rubber bearing and bearing screws and washers.03 jobs 8.Repairing of Guide spider by way of replacement of rubber bearings, nitrile rubber pads for arms, CS head screws M12 x 20mm, MS cover dia. 130mm with drilled 4 nos. holes for rubber bearing locking and locking screws M10 mm.03 jobs 9.Reconditioning of 200 mm dia. x 2000mm length, ERW 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 six nos. of M20 dia. size threads, MS welding to both ends of the flanges with main tube and then turning, facing both the ends in respect of all over accurate thickness, straightening and alignment, facing of the flanges. Complete job04 jobs 10.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 01 job 11.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. 01 job