OT-38/2020-21

Amount

Cleaning of tubes by buffing wheel to facilitate tube thickness survey at boiler II pass and other areas wherever required.

Providing the assistance for Boiler tube thickness survey in the boiler pressure parts

Conducting tube thickness survey in boiler pressure parts including the hire charges for ultrasonic thickness gauge.

Inspection of Shrouding plates in inter pass and 2nd pass of boiler pressure parts.

Replacing/ reconditioning the Shrouding plates with fixing clamps by welding at both sides of the tubes in the 2nd pass area, which includes LTRH,LTSH and Economizers.

Inspection/renewal if required of Pitch arresting Clamps in final Re-heater coils and welding with qualified IBR welder .

Air cleaning of Economizer (Super Heater Side & Reheater side), to enable physical verification of tubes inclusive of consumables, T & P and necessary illumination arrangements where ever required.

Air cleaning of LTSH to enable physical verification of tubes inclusive of consumables, T & P and necessary illumination arrangements where ever required.

Air cleaning of Primary Re heater tubes in boiler, to enable physical verification of tubes inclusive of consumables, T & P and necessary illumination arrangements where ever required.

Arrangement of platform and scaffolding materials and erection of the same wherever required in the boiler area for tube rectification work / hydro test and transporting the scaffolding materials.

Renewal of defective boiler tubes of size 44.5mm OD inclusive of transportation, cutting of defective tubes, edge/spool preparation, welding with IBR welder, cost of Argon gas, cutting gas, all consumables, T&P’s, hire charges for welding generator, TIG set and etc.

Cutting the worn out tubes of tube dia above 44.5mm, & up to 63.5X5.2mm edge preparation of the new & existing tubes, positioning the tubes with proper alignment, TIG and ARC welding the joint with IBR welder, cost of Argon gas, cutting gas, all consumables, T&P’s, hire charges for welding generator, TIG set and etc.

Surface preparation & metal Filing by arc welding to the required thickness in the eroded portions of the boiler tubes by the IBR welder including the cost of Welding electrodes & hire charges for welding generator & other T&P’s etc. Welding of size up to 150x25-mm

Lowering the coils for cutting, grinding and welding with providing proper chain block support and lifting the same coils after completion of works including the charges like consumables, T&P’s and etc.

Providing Platform arrangement at 3 levels (60.0m, 64.0m and 67.0m) for strengthening / Reconditioning the welding with clamp and to reinstate the dislodged shrouding again in Final Super Heater Coils in 350 slope of goose neck water wall from 64mtr level to 57mtr level, by following highest safety standards including charges for transportation and leading lifting of scaffolding materials to boiler required area, hire charges for T&P’s etc.

Restoring / Reconditioning of shrouding of various lengths of straight / bend in 35 Nos of coils of final super heater including cleaning of ash in the interpass slope and retrieving the fallen shrouding inside the ash, including charges for consumables, SS welding rods, hire charges for T&P’s etc.

Renewal of ERV, Startup vent valve, CRH to soot blower main MOV valve of size above 44.5mm OD inclusive of transportation, cutting, edge/spool preparation, welding with IBR welder (Filler wire will be supplied by Board at free of cost)

Stress relieving and NDT- Radiography test for ERV valve in the welding joints

KUMAR ERECTORS