Daily round the clock routine maintenance with respect to both boiler Preventing Breakdown maintenance of Pressure Part of Unit 8 and 9 DTPS Kasimpur

Amount

Daily round the clock routine maintenance with respect to both boiler of Unit # 8 & 9 ‘D’ TPS

Attending the leakages of water wall tubes in boiler Furnace from down comer / ring header to 50 meter including burner Zone:

Attending tube leakage up to Ist ten H.P. weld joints. (irrespective of number H.P. weld joints in one frequency)

Attending tube leakages for each H.P. weld joints beyond 10Nos. of H.P. weld joint.

Attending the leakages from economizer / LTSH tube

Attending tube leakage up to Ist ten H.P. weld joints.(irrespective of number H.P. weld joints in one frequency

Attending tube leakages for each H.P. weld joints beyond 10Nos. of H.P. weld joint.

Attending the leakages in ceiling super heater tubes situated in furnace top before platen super heater, platen super heater tubes

Attending tube leakage up to Ist ten H.P. weld joints.(irrespective of number H.P. weld joints in one frequency).

Attending tube leakages for each H.P. weld joints beyond 10 Nos. of H.P. weld joint

Attending the leakages in cold reheat & HRH tubes, Arch Tubes, screen tubes, water wall hanger tubes, super heater hanger tubes, final super heater, exit super heater tubes, extended water wall tubes, ceiling super heater tubes beyond platen super heater

Attending tube leakage up to Ist ten H.P. weld joints (irrespective of number H.P. weld joints in one frequency)

Attending tube leakages for each H.P. weld joints beyond 10 Nos. of H.P. weld joint

Attending the leakages from SCW super heater tubes and extended super heater tubes

Attending tube leakage up to Ist ten H.P. weld joints (irrespective of number H.P. weld joints in one frequency)

Attending tube leakages for each H.P. weld joints beyond 10 Nos. of H.P. weld joint

Attending the leakages of hand hole plates of different pressure part header by removing hand hole plates with hand hole cutting equipment, re welding of the same after complete preparations and stress relieving of the same after welding if required. Rates should be quoted on as per jobs basis.

Attending the leakages of header stubs up to Ist ten stubs joints in one frequency of different pressure parts headers of boiler.

Fixing of sky climber in boiler furnace after making proper platform on bottom ash hopper, its operation during execution of the works and dismantling and removal of ash hopper platform after completion of jobs. Rates should be quoted on as per job basis

Removal of damaged clamps / binders /scallop bars etc. and replacement / refitting of the same with new / repaired one in different zones of the pressure parts. The rates should be quoted on as per No. basis as under.

‘U’ Clamps

Scallop bars

Binders, support band, lugs

Flexible Connectors (male / female)

Fabrication of Hot bends of various degrees and radius of curvature from straight pressure parts tubes by filling sand and heating gas to required temperature of following materials.

Carbon Steel

Alloy Steel

Stitch Welding of fines of water / steam cool wall for securing of respective positions of tubes.

Rectification / replacement of Ash Protector / Shielding / Cassette baffles found damaged / eroded / dislocated or providing new protector in the following pressure part zones ( Rates should be quoted on as per No. basis)

Tubular (half round) protector of platen super heater / Re heater inlet etc and their spacer tubes. Protector /shielding shall be rectified / installed with the help of sky climber

Rectification / replacement of box type protector / cassette baffles found damaged / eroded / dislocated in LTSH / Economizer etc.

Tubular protectors / shielding of water wall hanger tubes / water wall screen tubes / final super heater / LTSH / economizer / re heater etc. Protector / shielding shall be rectified / installed with the help of scaffolding to be erected by agency as per requirements.

Rectification / replacement of box type protector / cassette baffles found damaged / eroded / dislocated of water wall hanger tubes / water wall screen tubes / final super heater / re heater etc. Protector / shielding shall be rectified / installed with the help of scaffolding to be erected by agency as per requirements

Erection of Scaffolding and plate form in the following areas:-

Economizer hopper (above).

S-Panel & bottom ash hopper.

Reheater inlet & outlet.

Water wall screen tube / final super heater / super heater screen tube

Build up of eroded portion of the tubes caused by ash / steam erosion using suitable welding electrodes matching with parent metal composition. Depth of erosion up to 2.5mm, length of erosion up to 250 mm.

Lifting and taking out the complete coils in pair of LTSH horizontal coils (upper or lower ) after cutting clamps supports , clits, stoppers and releasing from subsequent headers and coil & their restoration after placement of coil.

Lifting and taking out the complete coils of Economizer (upper or lower) after cutting clamps supports , clits, stoppers and releasing from subsequent headers and coil & their restoration after placement of coil.

Replacement of eroded / damaged tubes / bends of pressure parts in different zones of boiler during preventive maintenance as per procedure mentioned in annexure of the following

Carbon / low alloy (T-11) joint

High alloy (T-22) joint

Stainless Steel Joint

Shifting of sky climber in boiler furnace at different locations for attending and inspection of various pressure part zones. Rates should be quoted on as per job basis

Cutting and removal of skin casing / high crown plate by grinder and welding the same with suitable electrode by High pressure welding method, after completion of repair jobs of pressure parts if any.

Thickness - up to 15 mm

Thickness - 16mm or above

Replacement of Safety Valve

Replacement of following size valves.

15mm to 25 mm valves.

40mm to 50mm valves.

65mm to 70mm valves

100mm valves

150mm to 200mm valves

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