MID/AN/10

Providing, fitting, installation, testing and commissioning of Dresser couplings 500 mm of 20 cusecs discharge VT Pumps at LIS Ranjan. 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. after disconnecting the incoming power supply i.e 6.6 kv from the main panel then opening & disengaging coupling set (Motor half coupling & pump half coupling) of unit, separating motor from motor by opening all its nuts & bolts and stacking the motor on the motor skirt/steel fabricated stool properly then dismounting, Partial dismantling & Extraction of the 20 cusec VT pump from the existed pit by way of extracting the line Assembly i.e. column pipes, top shafts, line shafts, shaft enclosing tubes, spiders and muff couplings from the installed position of pit one by one by using installed over head crane & tools & tackles with the help of skilled & semi skilled workers. complete job

Alignment & strengthening of delivery pipeline, the job includes cutting & dismounting of old/damaged dresser coupler from the delivery line by using gas cutter/welding set & engaging a highly skilled welder after making all the precautionary/scaffolding arrangement for holding the delivery pipe/dresser coupler properly, then providing & fitting of spacer (new pipe piece) of 500 mm dia, with 8mm thickness and length as per site requirement. Fitting of the spacer shall be done by way of welding using superior quality welding electrodes and then grinding the surface for removing the extra flux if any after making proper alignment with delivery line.

Replacement of old Dresser coupling by way of providing , fitting in position , testing and commissioning of New Dresser Coupling for MS delivery line of 12 mm thick, nominal bore 500mm with discharge of 20 cusecs of cold silt content water. The dresser coupling shall be of actual parameters / specifications as that of existing one. The coupling shall have cylindrical steel middle ring, two follower rings on either sides and a set of high strength steel track head bolts. The middle ring shall have a conical flare at each end to receive the wedge portion of the gasket and the follower rings confine to the outer shape of the gasket. The follower ring shall be 20 mm thick, having outside Diameter 650 mm, PCD 600 mm, dia of each hole for M 16 with 18 no of holes. Both the gaskets shall be of special compound. The job includes dismantling of existing old/ damaged Dresser Coupling from its position and extraction of the same from delivery line. Fitting of new Dresser coupling in position in proper alignment with respect to existing delivery line and allied components. The job includes cutting and welding of Discharge pipe line/ dismantling flanged joint on upstream of coupling followed by re- jointing with new rubber gaskets, required for extraction/dismantling and fitting in position of coupling as permissible under standard practise for such pressure/discharge steel pipe lines in accordance to site conditions. Providing and fitting in position of 18 no. of M16 x 250mm size high strength steel track head bolts and tightening them appropriately in position to draw the follower rings together thereby allowing permissible/specified compression of gaskets between the pipe line and middle ring to ensure absolute water tight sealing. Complete job including cost of material, loading unloading & handling mechanically/ manually, labour, mobilisation of man/machinery/tool-tackles, testing and commissioning after installation for all connected parameters. Complete job including the cost of material after deduction of rebate on old material/scrap.

Transportation/to & fro carriage charges on a/c of mechanical as well as manual transport of fabricated/raw material viz gas cutter, welding set, tools & tackles etc from workshop to LIS Ranjan including loading & unloading by the semi-skilled labour. Job also includes all other unforeseen expenses required at site.

Assembling /lowering the partially extracted column parts viz shafts, muff couplings, spiders, shaft enclosing tubes, column pipes one by one by using packing sheets & high class nuts & bolts after tightening the same with the help of skilled & semi-skilled workers then placing the HT motor on the respective pumping unit. The job includes tightening all the nuts /bolts coupling pulley, making the connections of cables of stator as well as of rotor then checking the connections. Complete job

M/S TRIKUTA ELECTRICAL & MECHANICAL WORKS

BEE AAR ENTERPRISES