MTPS I TM Unit III Replacing the existing defective vent condenser tube nest by spare tube nest in Unit III

Amount

1) Dismantling the Vent Condenser, water box and connected pipe lines, cleaning the water box tube nest flanges and connected pipe line flanges, and renewal of gaskets, inspecting the tube nest for leak. Removing studs and nuts in the vent condenser main flange, condensate inlet and outlet pipe line and placing it on the platform. Removing water box, cleaning water box and shell flanges

2) Releasing the existing tube nest from the vent condenser shell, Shifting the tube nest from vent condenser shell to the loading accessible points in the vent Condenser floor level and lowering the tube nest to the Deaerator floor level and moving the tube nest by dragging it to the accessible point in the repair bay on the Deaerator floor I) a) Taking out the existing tube nest from the vent condenser shell.

b) shifting the existing tube nest from Vent condenser shell to newly erected access platform

II) a)Lowering the existing tube nest from the vent condenser platform to the Deaerator floor

II. b)Shifting and dragging the existing tube nest from the Deaerator floor of Unit- III to deaerator floor of Unit-II.

4) Lowering the existing tube nest from Deaerator floor to “O” Metre unit –II repair bay outside by mobile crane.

5) Transporting the released vent condenser tube nest from north side of repair bay outside to central stores.

6) Lifting the spare tube nest from “ O” Metre unit –II repair bay to Deaerator floor level by using mobile crane Lifting the new tube nest from “ O” Metre unit–II repair bay to unit-2 Deaerator floor level.

Shifting/dragging the spare tube nest from top of unit –II at (32 mtr level) Deaerator floor level to Unit-3 Deaerator floor.

Lifting it and placing it on the vent condenser platform and shifting and placing the new tube nest to the vent condenser shell

8) Positioning the tube nest inside the shell and assembling of water box and all connected pipe lines after providing gaskets and tightening of all flanges stud and nut etc.

Cost of ferrule for inserting inlet side water entry point of vent condenser tube nest to avoid tube erosion. Ferrule SS-304, Tube Size: Outer Dia -19.05 mm,Inner Dia 16.63.mm,Ferrule Thickness :0.5mm

Charges for 1 No. 50 T mobile crane for lifting the spare vent condenser tube nest from ‘0’ mtr to ‘32’ mtr height of Deaerator floor and removal of existing tube nest from 32 mtr height to ‘0’ mtr.

Consumables and T & P Charges for Item Sl.No: 1 to 11

T S CONTRACTOR