NCTPS I SE MI circle Boiler Maintenance Division Annual Overhaul works for the year 24 25 Specification No 208 24 25

Amount

Cutting, by grinding and removing the Feed water spray In let pipe line size 150 NB & 29mm thick at 18 Mtr elevation and grinding it to fit suitably into the piece. Including Consumable & T&P's.

Edge Preparation of Feed water spray In let pipe line size 150 NB & 29mm thick at 18 Mtr elevation and spool piece. Including Consumable & T&P's.

Preheating the weld area of spool piece Feed water spray In let pipe line size 150 NB & 29mm thick at 18 Mtr elevation and spool piece ( heating coils and welding transformer are to be arranged by the contractor) Including Consumable & T&P's.

TIG welding the spool piece, Feed water spray In let pipe line size 150 NB & 29mm thick at 18 Mtr elevation and spool piece and TIG welding the bypass line. Including Consumable & T&P's

Stress Relieving the welded area of the pipe line. Including Consumable & T&P's.

Overhauling of Main steam stop valve (MSSV): Providing chain block arrangement, dismantling of electrical actuator and motor assembly of 350 NB MSSV valve by loosening of all bolt and nuts. Dismantling of yoke assembly of valve by loosening and releasing of heavy size 16 Nos HT bolt & nuts. using chain block arrangement, lead, lift of material to 52 mtr elevation of boiler. Including Consumable & T&P's

Dismantling of total gland bolts and gland collar, bonnet clamp bolts, heavy size bonnet clamp, bonnet arresting split rings by using 7 ton capacity chain block arrangement, special heavy duty fixtures and 2 X 100 Tons capacity hydraulic jacks by lifting , lead, lift complete at 52 mtr elevation of boiler. Charges including consumable and hire charges for T&P's.

Dismantling of heavy size bonnet assembly with heavy size stem 100 mm Dia X 2 Mtr length with valve disc by using 7 tone capacity chain block arrangement, special heavy duty fixtures and 2 X 100 Tons capacity hydraulic jacks by lifting, lead, lift complete at 52 mtr elevation of boiler. Charges including consumable and hire charges for T&P's.

Fabrication of special type heavy duty Fixtures for facilitating to dismantle the heavy size Maín steam stop valve internals such as bonnet clamp, bonnet, split ring, packing, support ring and Gate disc. (a)Fabrication of special type heavy duty fixture for facilitating to dismantle the heavy size bonnet clamp of Main Steam Stop Valve from valve body by institute fabrication method. The work involves transporting, leading and lifting of required heavy steel materials to 52 metre elevation of boiler, designing of special type heavy duty fixture based on site condition, marking of fixture for the designed shape, Gas cutting and grinding of MS materials, welding of fixture to match with the site condition to facilitate for releasing of heavy size bonnet clamp from valve body. Charges including consumable and hire charges for T&P's. To be quoted on line

Fabrication of special type heavy duty fixture for facilitating to dismantle the heavy size bonnet, split ring, bonnet packing ring and support ring assembly of heavy size Main Steam Stop Valve from valve body by institute fabrication method. The work involves transporting, leading and lifting of required heavy steel materials to 52 meter elevation of boiler, designing of special type heavy duty fixture based on site condition, marking of fixture for the designed shape, Gas cutting and grinding of MS materials, welding of fixture to match to match with the site condition to facilitate for releasing of heavy size bonnet, split ring, bonnet packing ring and support ring assembly from valve body. Charges including consumable and hire charges for T&P's.

Reassembling of overhauled, rectified heavy size internals of "Main Steam Stop valve" (MSSV) such as, Actuator with motor assembly, yokel assembly, gland cooler, bonnet clamp, split ring assembly, bonnet assembly, new/ old stem, valve disc. (a) Overhauling and Rectification of MSSV internal parts, Lapping of seating surfaces of valve disc and seating ring with coarse particle lapping paste and fine particle lapping paste compound using lapping tool and surface plate, blue matching of valve disc and valve seat surfaces, repeating of lapping and blue matching process till achieving the perfect matching to ensure valve sealing by using 7 tons capacity chain block arrangement including consumables, T&P's, leading, lifting and assembling at 52 mtr elevation of boiler. Charges including consumable and hire charges for T&P's.

Renewal and re-assembling of defective parts of bonnet assembly such as grafoil gland rings, supporting ring, grafoil gasket in the bonnet assembly before assembling the bonnet assembly inside the valve, including sheet cutting of bonnet and valve body machining surface area by grinding, buffing and filling etc., assembling at 52 mtr elevation of boiler. Charges including consumable and hire charges for T&P's.

Reassembling of valve internals such as gland bolts , bonnet clamp bolts, bonnet assembly, SS valve stem (Ø 100 mm X 2 mtr), valve disc- having 350 mm dia and heavy weight, of 350 NB MSSV valve. using chain block arrangement after attending defects and aligning, matching, checking seating position including , leading, lifting and assembling at 52 mtr elevation of boiler. Charges including consumable and hire charges for T&P's.

Re-assembling of yoke of 350 NB MSSV valves by tightening of heavy size-18 nos HT bolt & nuts. Re-assembling of electrical actuator and motor assembly of 350 NB MSSV valve by tightening of all bolt and nuts using chain block arrangement and removing chain block arrangement including , leading, lifting and assembling at 52 mtr elevation of boiler. Charges including consumable and hire charges for T&P's.

Commissioning of Rectified and assembled MSSV by manual operation of full open and full close and adjusting of gland packing tightness and adjusting valve stem upper and lower travel limit for calibration of limit switch level, retightening of all bonnet bolts after conducting hydraulic test and again tightening after synchronising of unit at hot condition, leading and lifting upto 52 mtr elevation of boiler. Charges including consumable and hire charges for T&P's.

Valve actuators mounting and commissioning the valve operation. Charges including consumable and hire charges for T&P's.

Charges for renewal of defective boiler SH, RH, Valves and tubes of size above 44.5mm OD inclusive of transportation, cutting of defective tubes, edge/spool preparation, welding with IBR welder and assisting for hydraulic test. Including consumable and hire charges for T&P's.

Charges for cutting, edge preparation of phosphate dozing & impulse line, refixing and welding of below 1” pipe line, tee elbows, bends in Boiler pressure parts by IBR welder etc. at joints. Charges including consumable and hire charges for T&P's.

ferrofabs (BID ID -1199620)