• Temperature control valve problem on a gas turbine found at an upstream oil and gas facility

What did GE's analytics software find?

On May 10th, the GE SmartSignal solution detected an increase in the bearing metal temperature of a gas turbine at an upstream oil and gas facility. Bearing metal temperature increased to as high as 185°F (85°C) with a model prediction of 175°F (79°C). During the same period, a lube oil temperature increase from 140°F (60°C) to 150°F (65°C) was noted. GE’s Industrial Performance and Reliability Center (IPRC) added this item to the weekly report for discussion with the customer.

 

What was the underlying cause?

Upon investigation, the site discovered that the lube oil temperature control valve was sticking and was in need of replacement. Not all of the lube oil could be diverted to the cooler resulting in temperatures in excess of 150°F (65°C) with a set point of 130°F (54°C).

 

What was the value to the customer?

Due to the notification from the IPRC, the site was able to proactively schedule the replacement of the temperature control valve to minimize the impact on production.  The IPRC was able to provide a very early warning, as the site was operating well away from the high trip point of 180°F (82°C) for lube oil supply temperature.

Screenshot depicting increases in bearing temperatures and lube oil temperature (blue) versus expected values (green).

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