What did GE's analytics software find?
On February 11, the GE SmartSignal solution detected an increasing trend on the enclosure temperature of a gas turbine. The temperature, which usually operates at approximately 100°F, reached as high as 165°F while under investigation by the field. Due to the increasing trend in temperature, GE’s Industrial Performance & Reliability Center (IPRC) alerted the customer to this issue.
What was the underlying cause?
After investigation, the site found that the temperature started to increase when a temporary protective cover was in use due to sandblasting in the area. After completion of the sandblasting operation, the cover was mistakenly left in place, reducing the amount of air flow for enclosure cooling. After the cover was removed, the IPRC verified that the enclosure temperature immediately returned to normal operation and that the issue had been resolved.
What was the value to the customer?
After being notified by the IPRC, the site was able to investigate the issue and identify the problem prior to the temperature reaching alarm levels. Advanced notification allowed a scheduled investigation and eliminated the need to run in an alarm condition while the issue was investigated.
Above is an image depicting the increase in enclosure temperature (blue line) versus expected values (green line). No change in turbine loading or ambient temperatures was noted.