S.50 NCTPS II ES circle MRT Division Unit I Annual Overhauling 2025-2026 Maintenance Works Contract under open tender basis

Annual Overhauling works

Charges for cleaning and checking the tightness of CT, PT and control circuit terminals in 11KV, 3.3KV and 415V switchboard panels and also assistance during the testing of 217 no. of relays and attending defects, replacing defective relays, CT & PT terminal tightness checking in GRP panels, 11KV, 3.3KV, 415V switchgear panels as instructed by our maintenance engineer in charge. (Including consumables and T&P items)

Charges for checking of the limit switch gear mechanism, manual engage lever assembly, lubrication in the actuator and also topping up if necessary,cleaning the actuator and checking of the power and control terminal tightness. Removing the power and control cables for changing the orientation of the actuator, & during overhauling of the valves to be carried out by Turbine maintenance and Boiler maintenance. Reconnecting the power & control cables and E-pac assembly after completion of overhauling works by TM/BM and checking the operation of both local and remote as instructed by our maintenance engineer incharge. (Including consumables and T&P items)

Cleaning & Testing of Power modules in Variable Frequency Drives of ID FAN.

Removing & cleaning of Power modules & Voltage snubber circuits from VFD Thyristor bridge panel after disconnection of Gate, Cathode, NTDA card connection & pulse transformer circuit. Testing of each Thyristor cell in Power module and refixing of power module and Voltage snubber circuit in VFD Thyristor bridge panel reconnecting the same.(Including consumables and T&P items)

Lubrication Works

Inspection and top up of lubricants in Main Gear Case & Geared Limit Switch, renew grease if fully contaminated, checking of gear mechanism & limit switches, Torque switches and checking of Mechanical & Electrical operation of Low Torque range on Antrieb and Rotork actuators.

Provision of stainless steel woven wire mesh is to be made for fitting outside the existing doors. The mesh shall be fixed in a detachable stainless steel frame. The frame shall be fabricated to allow easy removal by sliding it through a groove, which is to be provided for this purpose. The frame shall be securely fixed and locked in the groove using locknuts. The stainless steel frame shall have dimensions of 940 mm × 535 mm. The stainless steel woven wire mesh shall be marked and cut to suit the frame size and shall be fixed inside the frame by riveting. The scope of work includes all necessary cutting, riveting, welding, and drilling with tools and plants (T&P) for proper installation. The fabrication shall be as per the requirements of electronic panel ventilation, as directed by the Engineer-in-Charge.

E pac Wall mounting work

The integral starter electronic module ( E-pac or Synchropack) shall be detached from the actuator and securely installed at the nearest approachable location on a steel post. Power and Control wiring shall be extended from the actuator using suitably sized copper multi core cables and fixed with appropriate adapters. The installation must ensure both water tight and Air- tight integrity. All operations shall be tested and verified upon completion.

Provision of Metallic low pressure water and dust ingression resitant junction box for actuator near approachable metal post which is to be erected. The Power cables to be erected. The power cables to be connected through the junction box as instructed by AE - incharge.

Materials

3 core 25sqmm (copper) flexible pvc cable for High Torque Motorised (upto 16000 Nm) Actuator Power Contactor

3 core 16sqm (copper) flexible pvc cable for High Torque Motorised (upto 8000 Nm) Actuator Power Contactor

16 core 0.75 sqmm (copper) flexible pvc cable for integral starter / epac / synchropack of motorised actuator control

Die Cast Aluminium IP55 or above rated Junction Box for fixing power cable terminations

Silver mild steel 19mm to 25mm width x 3mm thickness Strip (Required length in meters= 200) for fixing SS mesh

Stainless steel woven wire mesh 1-2 sqmm bore suitable to existing VFD ventilation

Amocam 100 or Equivalent Lubricant oil ( 1 actuator =0.5 Litre) of Lubrication of Motorised Actuators