MTPS I TM Units I to IV Inspection and Identification of punctured Spiral coils in HPH 5 6 7 by removing the de Superheating Zone shrouded plate 1 No and attending the puncture as and when required basis

Amount

Removal of Stand pipe on LHS & RHS and placing it on the repair bay.

Heating and removing of main flange cap nuts and studs of HP Heater.

Gouging of main flange joint of HP Heater.

Disconnecting & Connecting air evacuation line flange and safety valve bottom drain line flange after cleaning and providing gaskets .

Lifting of HPH shell and placing it on TG floor after disconnecting flange joints and drain line pipe joints.

Special type Scaffolding arrangements for HP Heater to inspect the punctured Spiral Coils.

To carry out hydraulic test and checking of all the coils for leak if any.

Replacing the defective drain line valves or equivalent in Heater drip, Condenser air, Axillary steam and drain water lines etc by Non IBR welder.

Locating the punctured Spiral coil, cutting and removing the coil, providing the new coil by IBR welding and to carry out the hydraulic Testing .

Placing the HPH Shell on the bottom flange from TG floor (including Alignment of Top & Bottom metal seal gasket) and reconnecting the flange joints and drain line pipe joints.

Tightening of main flange bolts and nuts by gas heating.

Erection of stand pipes on LHS & RHS.

Welding the shell side & bottom side metal seal main flange after placing shell on bottom Flange. This work involves preparing the ‘V’ groove for the top and bottom side main flange metal seal gasket and welding by Non IBR welder.(OD 2380 mm x 2250 mm x 6 mm thick). ( Standard joints = 63.5 mm x 5.2 mm)

Charges for cutting gas

Cost of welding electrodes for Item Sl.No:12 Electrode : E7018 –A1 (ARC)

Consumables and Tools & plants for Item Sl.No: 1 to 13