• Anshuman Agrawal

Reconditioning of EH Oil at IL&FS Tamil Nadu Power Company Limited

Customer: IL&FS Tamil Nadu Power Company Limited, is a 1200 MW (2 x 600 MW) Thermal Power Project at Cuddalore district in Tamil Nadu. This case shot is about the awareness of their team towards Lubrication Reliability and robust reconditioning procedures to maintain the parameter of EH Oil within limit to avoid breakdown of the plant and generation loss.

Concern Analysed: Rapid increase in the Total Acid Number (TAN) which could degrade the EH oil and led to possibilities of failure of Servo valve, hunting, power generation loss, unplanned shut down etc.

Proactive Measures Taken:

• Oil Analysis was done to check the properties of EH oil like Moisture, NAS value, Total Acid Number.

• External reconditioning System “MLC LVDH TRIX-20” was installed at site along with the deployment of Service Engineers till the desired target was achieved.

Below graph shows the trend analysis of tracked values during the recondition of EH Oil at Unit #2:

Solutions Implemented: The EH oil reconditioning units of Minimac system i.e. TAN Reduction by Ion Exchange method (TRIX) MLC LVDH TRIX 20 played a major role in achieving the properties range within the recommended limits and simultaneous reduction of TAN, Moisture and NAS value of the EHC fluid. An onsite training on the function of EH oil Re-Conditioner, FRF maintenance and contamination control, Importance of Oil Analysis Program was provided to their team by Minimac’s Service Engineer.

Consumable details are:

Filter consumption: 01 qty of 10-micron filter element and 01 qty of 3 microns consumed to achieve NAS 5 cleanliness

Total consumption of Resin: 60 Ltr

Benefits: • Extending oil life • Reduced TAN value • Increased turbine availability & reliability

• Eliminate oil change

Way Forwards: • It is advised to use FRF Re-conditioning system on regular basis 24x7 to keep oil properties within acceptable limits • FRF maintenance program should be scheduled and to be followed dedicatedly • Standard procedures of Refilling & changeover of control fluid should be followed • Oil Analysis Program (OAP) should be implemented

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