OT 20/24-25

Amount

Preparing scaffolding arrangement for Valve overhauling (HP Bypass control Valve/LP Bypass control valve 'A': Charges for providing the scaffolding arrangement at 15 meter elevation at HP Bypass main Valve including the cost of consumables & T&P’S.

Dismantling and assembling of the Complete Hydraulic actuator assembly. Charges for Moving the Piston into the bottom end position, Releasing of oil pressure from oil system, Disconnecting all connector and Hydraulic hoses from actuator, Removal of coupling locker & feedback linkage on coupling, Decoupling the piston rod from valve stem, Loosening and removing screw connection Actuator Yoke – Valve and lifting of the actuator from the valve by using the special fixture, Removing the complete Actuator unit from the HP Bypass control valve by using the special fixture and re assembling including the cost of consumables & T&P’S.

Dismantling the HP Bypass control valve/LP Bypass control valve 'A': Charges for removing of spray water pipe, loosening and removing of HSB Cap screw, Removing of bearing carrier, nozzle body etc., Removing of Bonnet Nozzle body, jet cage, seat ring etc., by using gas heating machine as per requirement, Removing of valve stem and cleaning of all parts by solvent & Inspection of stem, valve body assembly and other parts Dye penetration test for any defect including the cost of consumables and T&P’s.

Overhauling of HP Bypass control valve & LP Bypass control valve 'A': Charges for Repairing/ replacement of the Worn-out/damaged parts of the HP Bypass valve/LP Bypass Valve, Rectification of defects in valve stem and seat reconditioning with suitable welding electrodes by in-situ grinding & lapping using in-situ lapping machine and lapping disc, machining of seat with old/new stem, Lapping of valve stem with body seat to achieve contact blue matching including the cost of consumables and T&P’s.

Re assembling of HP Bypass control valve: Charges for Re-Assembling of all the parts in the correct sequence with new graphite gland packing ring, Spring stack and gland packing rings with metal end cap etc., including the cost of consumables and T&P’s.

Re assembling of LP Bypass control valve 'A': Charges for Re-Assembling of all the parts in the correct sequence with new graphite gland packing ring, Disc spring/Bottom ring and gland packing rings with metal end cap etc., including the cost of consumables and T&P’s.

Overhauling and Servicing of Isolation valve and Injection control valve of LP Bypass 'B: a. Dismantling of Isolation valve and Injection control valve: Charges for loosening and removing of HSB Cap screw, Removing of bearing carrier, nozzle body etc., Removing of Bonnet Nozzle body, seat ring etc., by using gas heating machine as per requirement, Removing of valve stem and cleaning of all parts by solvent & Inspection of stem, valve body, bonnet, cage, plug assembly and other parts Dye penetration test for any defect including the cost of consumables and T&P’s.

b.Overhauling and reassembling of Isolation valve and Injection control valve of LP Bypass 'B' Charges for Repairing/replacement of the wornout/damaged parts of LP Bypass Spray control valve and Re-Assembling of all the parts in the correct sequence with new soft goods such as stem packing, gaskets and balance including the cost of consumables and T&P’s.

Natesan Engineering Contractor