Biennial contract for Break down maintenance of pressure parts and round the clock routine/ preventive maintenance work of Boiler including oil/coal burner/igniter assembly/valves/scanner cooling fans and other associated system of boiler Unit 5 and

Amount

Attending tube leakage water walls tubes in boiler furnace from down comer/ring header to 50 meter including burner zone, Economizer tubes, LTSH, SCW, Re-heater tubes, Arch Tubes, screen Tubes, Final Super heater, Exit SH Tubes, Extended water wall Tubes, Ceiling Super heater tubes including platen super heater up-to Ist ten HP weld joints(irrespective of Number HP weld joints in One Frequency)

Attending tube leakage of each HP weld joints beyond 10 numbers of HP weld joints including joint of carbon steel/T-11/T-22/T-91/TPH-347 including all diameter.

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

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.

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 Carbon steel.

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 Alloy steel

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

Rectification /replacement of ash protector found damaged/eroded/dislocated in different pressure part zones.

Replacement of eroded/damaged shrouds of Boiler Tubes of ECONOMIZER, LTSH, SCW, SCREEN TUBE and Others TUBES of Boiler

Repairing/Reconditioning/Replacement of eroded/damaged cassette baffles of Economizer and LTSH tubes

Erection of scaffolding and platform in Platen Super heater tube above zone

Erection of scaffolding and platform in S-Panel & Bottom ash Hopper

Erection of scaffolding and platform in Re-heater inlet & outlet

Erection of scaffolding and plate form in water Wall Screen tube/final super heater/super heater screen tube.

Erection of scaffolding & platform in whole zone of Platen Super heater

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 2.5 mm, length of erosion up to 250mm

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

Lifting and taking out Complete Coils in pair of Economizer (upper or lower) after cutting clamps supports, clits, stoppers and releasing from subsequent headers and coil and their restorastion after placement of coil

Rectification of Buck Stay/putting buck stay pin on its position in second pass of Boiler/Corner No.1,2,3,4.

Replacement of Eroded tubes/bends of pressure parts in different zones of Boiler-carbon/low alloy(T-11 and T-22) Joint

Replacement of Eroded tubes/bends of pressure parts in different zones of Boiler-Stainless Steel Joint

Internal water washing of 2nd pass of boiler

Cleaning of Economizer hopper and APH Hoppers

Cleaning and Disposal of Fly ash foreign material from pent house, dog house etc

Round the clock routine and preventive maintenance work of Boiler including oil/coal burner, igniter assembly, valves, scanner cooling fans and other associated system keeping watch on abnormal sound of Ist/IInd pass, monitoring of flame & clinker formation of boiler Unit# 5 & 6 of 2x250MW, PTPP, Parichha (One job consists of 24 hrs-03 shift of 8 hours per unit of 2x250MW)

System line up for filling of feed water through boiler feed pump for hydraulic test of boiler and normalization of the same after hydraulic test making the system ready for boiler light–up in unit no. 5&6 of 2x250MW, PTPP, Parichha.

Thickness survey of Boiler Pressure parts consisting 16 Hangers Economizer (lower & upper bank) / 16 Hangers of LTSH and other area of boiler pressure part i.e. water wall, SCW, CRH, HRH, FSH etc.

DP test of dissimilar joints of Header Tubes (DP Kit shall be in the scope of Contractor).

Repairing of seal trough, making of scaffolding plate from rear and front side, lifting & alignment and welding of seal trough plates.

SHAKSHI ENGINEERING CO.