Reconditioning of 900 VM-2, 60 cusecs 32.30m head VT pump of unit No.3 installed at Tawi Pump House by way of replacement of damaged components

Amount

Transportation charges for shifting of worn-out column assembly and bowl assembly of 900 VM-2,60 cusecs, 32.30m head VT pumping unit No. including other items such as guide spiders, shaft enclosing tubes, muff couplings, S.S line shaft to the workshop by way of loading in mechanical transport from Tawi pump house and unloading the same at the workshop with the help of crane and manual labour

Fabrication and fitting of one number line shaft bearing holder by way of fabrication out of cast Iron having 230mm height, 170mm outer dia. and 125 inner dia. for housing of line shaft rubber bearing with 10mmx20mm size seat portion at bottom end of bearing holder for resting of rubber bearing, with inbuilt flange in the center of bearing holder of 25mm thick and 70mm wide with 12 Nos. holes of 18mm dia. on it at an equal distance. Each hole should be at a distance of 19mm from the outer end of the flanges as per sample. The bearing holder shall be checked for its proper alignment with dial gauge at different off sets during fabrication.

Fabrication of S.S. Impeller shaft for 900VM-2 60 cusecs VT pump unit No.3 installed at Tawi Pump House, Jammu out of AISI 410 stainless steel 1885 mm long having provision of 970 mm seat portion of 95mm dia. at the top end of the shaft for fitment of muff coupling and first rubber bearing holder with provision of key way all around the shaft 8mm deep, 20 mm wide at a distance of 130mm from the top end and also 100mm long and 8mm deep and 20mm wide key way for flat key of muff coupling starting from the top end i.e. from 970mm up to 1460 mm ,490 mm long , 80mm dia. Reduced portion for fitment of SSSleeve and SS impeller with provision of 80 mm long ,20mm wide and 8mm deep keyways for S.S. Impeller on 80 mm dia. seat portion and also 30 mm wide and 8mm deep keyway all around the shaft at the end of 80 mm dia seat portion for fitment of S.S. Impeller round locking keys and also 260 mm long of further reduced portion of 70 mm dia. for bottom rubber bearing seat as per sample. The shaft shall be checked for its proper alignment with dial gauge at different offsets during fabrication and fitment of shaft into the S.S. impeller.

Reconditioning to 4th line shafts of VT pump by way of rebuilding worn out seat portion of the bearing on the line shaft with suitable S.S. electrodes conforming to AISI-410 grade. Turning, finishing, 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.

The job further involves back carriage of the repaired/Fabricated column assembly and bowl assembly parts i.e., guide spiders, shaft enclosing tubes, Muff coupling and SS line shaft, etc. to the site of Tawi pump house by way of loading in mechanical transport at workshop and unloading at site of Tawi pump house, Jammu with the help of E.O.T. crane and manual labour.

The job also includes providing of consumables items for fitting during lowering of the VT pump like thrust pad to guide spider-06 nos, line shaft rubber bearing 7 Nos., bottom rubber bearing 1No., HT column bolts with nuts 120 x20 mm (reputed make) 24Nos.,HT shaft enclosing tube bolts with nut 110x16 mm 20 Nos. HT bolt with nut 110x25 mm(reputed make) 08 Nos., HT bolt with nut 95x20 mm 06 Nos., HT bolt with nut 55x16mm 12 Nos., HT Allen key bolts 40x16 mm 08 Nos., HT Allen key bolts 40x12 mm 12 Nos., HT Allen key bolts 40x5mm 12 Nos., spring washers16mm-24 Nos., spring washers 12mm 24 Nos., fire fly sheet 1/32 6 kg, fire fly sheet 1/16 5 kg., rubber insertion sheet 1/18 13 kg, gland packing ¾” 2 kg, Grease 10 Kg, hacksaw blade double edge 6 Nos., HT bitumen tape roll, emery cloth 7 mtr, dhoti cloth 3 kg Providing lubricating oil 15 liters servo system 46 (servo system 46-and grease is to be provided by the department) fitting of pump and motor half coupling, checking alignment of pump and motor using dial gauge, making all the connections, tightening bolts, providing of gasket, electrical thimbles and then testing on full load.

M/S TRIKUTA ELECTRICAL AND MECHNICAL WORKS

G S ENGINEERING WORKS