Replacement of old damaged/broken components of 900 VM-2, 60 cusecs, 32.30m head VT pump no 4 installed at Tawi Pump House, Jammu.

Amount

Transportation charges for shifting of worn-out damaged parts of 900 VM-2, 60 cusecs, 32.30m head VT pumping unit No.4 after dismantling of shaft enclosing tubes, muff couplings, S.S line shaft and allied parts to the workshop by way of loading/shifting from Tawi pump house and unloading the same at the workshop with the help of crane and manual labour. Reconditioning of suction bell by way of gas cutting of badly damaged shroud and all the damaged stud of the shroud .Extraction of damaged shroud and removing of all the old / damaged welding from the surface of all the four nos. Cross arms of the shroud and inner portion of suction bell with the help of gas cutter .Rebuilding of inner bore of damaged bottom rubber bearing holder with suitable CI machinable welding electrodes to the required thickness /dia. and turning .finishing and polishing of welded portion of bearing holder to the required size of outer dia of bottom bearing. Rebuilding of inner surface portion of the body and all the cross arms with suitable hard facing electrodes longitudinally and circumferentially for rebuilding and filling of pitting and cavitation caused during operation. Finishing of welded portion using grinder in such a way that original angle and profile and thickness of the body and arms is not disturbed. Drilling of four Nos hole and threading as required for fitment of cover plate of rubber bearing. Job includes Fabrication and fitting of new impeller Shroud as per sample on the suction bell with the help of studs and welding along the internal periphery using CI machinable welding electrodes and then turning finishing the welded portion. Reconditioning of the bowl guide of VT pump by Providing and fitting of new bowl guide sleeve by way of extraction of damaged sleeve and fabrication of new bowl guide sleeve out of C.I material as per sample. Turning, finishing, polishing to required size, facing of the flange for proper fitment into the bowl guide, drilling 12 No. Equidistant holes at the flange for proper fitment of 16mm bolts, machining of inner bore of sleeve to the required dia of the outer dia of the line shaft rubber bearing. Providing and fitting of 12 Nos. HT bolts of 65mm X 16mm size with locking washers for fitment of bowl guide sleeve into the bowl guide. Job includes rebuilding of seat portion for fitting of sleeve on the bowl guide by way of re metaling, turning finishing and polishing to the required size drilling of 12 Nos holes with threading of 16 mm dia for fitment of sleeve. Complete job includes cost of material labor charges including fabrication cost. Fabrication of stuffing box as per sample out of CI alloy 370mm in height having inbuilt flanges of 320mm dia and 20mm thick at a distance of 225mm from the bottom end of the stuffing box having 170mm outer dia and 124mm inner dia and 200mm long seat portion inside the bottom end in the stuffing box for housing line shaft rubber bearing. The top end of the stuffing box is having 180mm outer dia, 130mm inner dia and 115mm long seat portion for gland packing. Providing of 4 no. stiffener at the top end at an equal distance and through and through 160 mm long 16mm dia hole at the top end for lubrication line of line shaft rubber bearings. Drilling of 8 no. holes of 18mm dia at a distance of 20mm from the outer end of the flange. The stuffing box shall be checked with dial gauge on lathe machine. Reconditioning of first and 2nd line shafts of VT pump by way of rebuilding of worn-out seat portion of the bearing on the line shaft with suitable S.S. electrodes conforming to AISI-410 grade. Turning, finishing, and polishing of the rebuilt portion to required size. Checking of eccentricity developed at the different off-sets of the shaft during operation and removing the eccentricity developed by means of press bench. The tolerance limit be kept within the prescribed limit of +0.03 mm. then repairs to shaft holes /pin holes/key ways including fabrication and fitting of SS pins, SS keys and one no. jib head key as per sample. Repairs to 2nd shaft enclosing tubes of VT pump by way of checking of face-to-face alignment and eccentricity developed in the enclosing tube at different off-sets with the help of dial gauge on lathe machine. Removing of eccentricity developed after welding /patching at the cracked portion with suitable M.S. welding electrodes and also welding of the cracked stiffeners of the flanges of the enclosing tubes. Repairs to 01 Nos. Muff coupling by extraction of broken/damaged bolts from both the halves of the S.S. coupling by drilling and rethreading the drilled holes for 16 mm dia. Allen bolts. Repairs/rebuilding damaged /worn out portion of the muff coupling by way of welding with the suitable S.S. electrodes and turning, finishing, polishing of the welded portion to the required size. Reconditioning 01 no. guide spider by way of welding of damaged/worn out seat portion of guide spider with suitable C.I. electrodes and finishing the welded portion as required making the surface even. Extraction of broken/damaged bolts by drilling and rethreading the drilled holes for fitment of counter sunk bolts. P/F of rubber pads with counter sunk bolts in all the three arms of guide spiders. The job further involves back carriage of the repaired assembly parts i.e. shaft enclosing tubes, SS line shaft and Muff coupling etc. to the site of Tawi pump house by way of loading/shifting from workshop and unloading at site of Tawi pump house , Jammu with the help of manual labour. The job involves replacement of thrust pad of other 02 Nos guide spider- (06 Nos). Re-assembling and lowering of extracted VT pump and column assembly involves complete wiping ,cleaning repaired parts, lowering of complete bowl assembly , column assembly in proper sequence by fitting of column pipes and fitting further, lowering fitting of shaft enclosing tube along with line shaft one by one to discharge head and Tee joint fitting with rising main of 36” dia. P/F of consumables items during lowering of the VT pump like line shaft rubber bearing 7 Nos.( Provided by the Deptt.) bottom rubber bearing 1No., HT column bolts with nuts 120 x20 mm (reputed make) 24 Nos., HT shaft enclosing tube bolts with nut 110x16 mm 16 Nos. HT bolts with nuts 110x25 mm(reputed make) 15Nos., HT bolts 45x16 mm 10 Nos., HT Allen key bolts 40x12 mm 12 Nos., HT Allen key bolts 40x16 mm 06 Nos, HT Allen key bolts 40x5 mm 12 Nos, spring washers-16mm 24 nos., spring washers 12mm 24 Nos., fire fly sheet 1/32” 6 kg, fire fly sheet 1/16” 7.5 kg., rubber insertion sheet 1/18” 12 kg, gland packing ¾” 2kg,hacksaw blade double edge 6 Nos., HT bitumen tape roll, emery cloth 6 mtr., Dhoti cloth 3 kg., Grease -10 kg and servo system 46-15 litre for topping of motor (Grease and servo system46, provided by Deptt.) Fitting of pump and motor half coupling, checking alignment of pump and motor using dial gauge, making all the electrical connection, tightening bolts, providing of gasket, electrical thimbles and then testing on full load. Skilled person shall be provided by the firm for extraction /fitting /assembling of parts during lowering of VT pump. Complete job includes cost of materials and labour charges.

GS ENGG WORKS (BID ID -2227679)

M/S V.N ENGG WORKS (BID ID -2224624)