Work of Boiler Pressure Part During Boiler Breakdown Maintenance of Unit no. 9,10,11 BTPS OBRA

Amount

Attending the leakage of water wall tube in the boiler from down comer ring header to 52M/L, including burner zone and platen water wall (as per procedure).

Attending tube leakages up to first 10 joints (Irrespective of weld joint in one job)

Attending tube leakages of each weld joints beyond 10 joints.

Attending tube leakage from economizer and convective super heater as per procedure.

Attending tube leakage up to first 10 joints (irrespective of weld joints in one frequency)

Attending tube leakage of each weld joint beyond 10 joints.

Attending leakage of following parts i)Platen super heater, ii)Ceiling super heater tubes situated on the furnace top before paten super heater as per procedure annexed.

Attending Tube leakages up to first 10 joints.

Attending tube leakages of each weld joint beyond 10 joints.

Attending tube leakages of following parts-i)Cold Reheat, ii)Hot Reheat, iii)Arch tubes, iv)Screen tubes, v)Extended water wall tubes, vi)Hanger tubes, vii)Exit S/H tubes, viii)Ceiling S/H tubes, ix)Headers Nipple tubes.

Attending tube leakages up to 10 joints.

Attending tube leakage of each weld joint beyond 10 joints.

Attending tube leakages in SCW and extended super heater as per procedure annexed.

Attending tube leakages up to first 10 joints.

Attending tube leakages of each weld joint beyond 10 joints.

Attending Pin hole crack of boiler tubes, headers stubs etc. in entire first pass, second pass, furnace zone, pent house etc.

Attending the leakage 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.

Attending the leakage of header stubs upto Ist ten stubs joints in one frequency of different pressure parts headers of boiler.

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-

a) 'U' Clamps.

b) Scallop Bars.

c) Binders, Support band, lugs.

d) 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 -

a) Carbon Steel.

b) Alloy Steel.

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 -

a) Carbon Steel/Low alloy (T-11) joint.

b) High alloy (T-22) joint.

c) Stainless Steel joint.

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 -

a) Thickness - upto 15 mm.

b) Thickness - above 15 mm.

Erection of scaffolding and plateform in S-Panel and bottom ash hopper.

Fins welding of water wall & steam cooled wall (Single side of fin welding length).

Complete washing of Boiler -

Complete washing of False Ceiling.

Complete washing of Pent House.

Complete washing of Dog House.

Complete washing of Cat House.

Complete washing of Re-heater gallery.

Complete washing of all plate form (from 8m/l to 52m/l).

Washing Over SA duct from APH outlet to wind box (L&R).

Washing of wind box (L&R).

Washing of area between front side of Boiler & RC Bunker.

Rectification/replacement of ash protectors/ shielding/cassette baffles found damaged/eroded /distorted or providing new protectors in the following pressure parts Zone of Boiler:

Tubular protectors/shielding of SH tubes,RH tubes,Water Wall tubes,LTSH Coils, Economizer coils and other area of boiler. For installation of protectors necessary scaffolding has to be made by the agency.

Box type protectors/cassette baffles of LTSH Coils, Economizer coils etc. For installation/rectification of protectors necessary scaffolding has to be made by the agency.

Inspection of Pressure Parts Tubes and Build-up of eroded portion caused by ash/steam erosion using suitable welding electrode matching with parent metal composition by Arc/Argon welding of 250mm length, 35mm width.

Erection of scaffolding and making approaches for checking of pressure parts tubes for rectification of defects. If any, in the following areas/zones and dismantling after completion of work

Super Heater/RH /W.W. Screen tube/SH screen tube/Low temperature super heater/ Economizer etc in single layer/elevation.

Super Heater/RH/W.W. Screen tube/SH screen tube/Low temperature super heater/ Economizer etc in multi layer/elevation.

Mobilization of team, Installation & Fixing of sky climber in boiler furnace after making proper plateform on bottom ash hopper. Dismantling and removal of sky climber/ash hopper plateform after completion of job.

Shifting of sky climber in boiler furnace at different location and inspection of various pressure part zones.

Operation of Sky Climber up to 24 hrs.

Operation of Sky Climber outside of boiler for checking its healthiness.

Servicing of control panel box of sky climber (motorized rope climbing machine).

Servicing of gear box, break assembly, internal drums and rollers of sky climber motor assembly.

Shifting of Material from Central store/site to BMD-I site store /upkeeping of site store.

M/s KIRAN CONSTRUCTION CO.

M/s. Azmer Enterprises