Replacement of Gasket of 160 MVA Transformer - III

Partially dismantling top layer ring (water & air) & bottom layer air pipe line of emulsifier system and stacking safely at proper place.

Proper and safe dismantling of 220 kV LA (R,Y,B Phase)

Proper and safe dismantling of 145 kV LA (R,Y,B Phase)

Proper and safe dismantling of HV/IV bushing jumper terminal connector and reconnect after replacement of gasket work.

Complete draining out the T/F oil by the centrifuging machine from T/F to 50/20 kl. Oil storage tank (providing by the UPPTCL) including shifting of oil storage tank from open store to working place by the contractor at is own cost. The work bill be done under process in dry air system.

Providing of dry air system for completion of work as the time of dismantling of T/F, draining out of the T/F oil, replacement of gasket, feeling the T/F oil, vaccum in T/F and erection of T/F for different parts as bushing/maintank cover/inspection window/OLTC chember/bucholze/PRV etc. Filling of dry air of dew point (-55 PPM) of better for completion of work. The work shall including connecting pipe as required measuring dew point value of dry air. dew point and PPM meter providing by the contractor.

Dismantling of all accessories as HV/IV bushing/bushing turret/tertiary/neutral bushing inspection window, radiators all flanges and butter fly valves, connected to header and oil pipe line, OLTC chamber, bucholze, PRV relay etc. With the help of skilled labour, technican and special T&P include crain with operator providing by contactor. Keeping all parts safely at proper place and opening all nut bolts of main tank cover, jacking and lifting the main tank with providing special type jack threading nuts bolts extra 10mm thickness pipe support as per required no. of quantity and height for distance maintaining between top cover and main tank so that it can be easily replaced main tank gasket.

Replacement gasket as per details given below the scope of work involves removal of old/used gasket, cleaning the surface with wire brush/emery paper/cotton clothes etc. Fabrication of gasket of appropriate size of thickness 16/12/10/8 MM of Konica/Nucork make and fixing of gasket with adhesive along with other associated work. Gasket should be oil resistant and as per IS 4253 and contractor must be have submit test report of the gasket before replacement. (The all dismantling work under carried out in the presence of dry air system, the pressure of dry air should not be less than 0.25 kg/cm2 and dew point 50 deg cel. in main tank)

Providing and fixing main tank gasket (20mm)

Providing and fixing HV side bushing inspection window gasket 500x500 mm (03 Nos.), 500x750 mm (03 Nos.), 400x1200 mm (01 No.), 200 mm (03 Nos.)

Providing and fixing HV side bushing turret gasket (R,Y,B Phase)

Providing and fixing HV side bushing gasket (R,Y,B Phase)

Providing and fixing IV side bushing turret gasket (R,Y,B Phase)

Providing and fixing IV side bushing gasket (R,Y,B Phase)

Providing and fixing tertiary bushing gasket (03 Nos.) (R,Y,B Phase)

Providing and fixing equalizising pipe line joints gasket 50 mm (14 Nos.), 80 mm (03 Nos.), 25 mm (16 Nos.), 100 mm (10 Nos.)

Providing and fixing tertiary top and bottom plate/turret gasket

Providing and fixing OLTC chamber plate top & bottom gasket (R,Y,B Phase)

Providing and fixing main header pipe line joints/flange gasket 150 mm (11 Nos.), 200 mm (20 Nos.), 250 mm (08 Nos.), 300 mm (01 No.)

Providing and fixing main header pipe line B/F gasket 200 mm (10 Nos.), 100 mm (01 No.)

Providing and fixing radiator gasket and air release plug washer (Teflon)

Providing and fixing main T/F drain valve gasket 50 mm (01 No.), 100 mm (01 No.)

Providing and fixing bucholze gasket

Providing and fixing PRV gasket

Providing and fixing main conserbator and OLTC gasket

Providing and fixing MOG gasket

Erection of all dismantled accessories of 160 MVA T/F with tightning nut bolt after replacement gasket of deferent parts of the T/F. With the help of skilled labour, technican and special T&P include crain providing by contractor

Erection of top layer ring (water & air) & bottom layer air pipe line of emulsifier system including providing consumable item like gasket/nut bolts etc. after replacement of gas kit work. If any leakage of air/water is found in the air/water pipe line than attending it and maintain 06 kg pressure air and 08 kg pressure in water of deluge valve is also include.

Proper and safe erection of 220 kV LA (R,Y,B Phase)

Proper and safe erection of 145 kV LA (R,Y,B Phase)

Complete evacuation inside the 160 MVA T/F and felling of dry air with dew point -55 or better in vacuum up to pressure 0.25 kg per cm2 by the using centrifuging machine (6 kl) and process will be continue till get desired value of dew point and stand for 24 hrs. If vaccume is break in T/F during 24 Hrs. than again it will be maintain by centrifuging machine and it also standing for 24 Hrs. This process will be repeated until the vaccume of T/F reaches less than 01 TOR and stand for 24 Hrs.

Filling the T/F oil from 50/20 kl oil storage tank to T/F by using centrifuging machine and check. If any leakage. If any leakage/Ceepage of oil is found in T/F than attending it is also include. Note:- The above work out in the presence of dry air system

Centrifuging and Circulation of T/F oil of 160 MVA T/F After complete erection and taking BDV values of oil and IR values periodically till the required value is reached as per direction of Engineer (centrifuging machine with operator and oil testing set shall be provided by the contractor)

SATKAR TRADERS

TAJ ENTERPRISES