Frame 5 Hot Gas Path Inspection for National Grid
HPI completed a successful hot gas path inspection for National Grid, an international energy delivery company. National Grid called upon HPI to help diagnose the cause of significant vibrations affecting one of the backup emergency turbines at its plant on Long Island.
The 15 MW GE Frame 5 model J gas turbine is used to boot the station in the event of a power outage. HPI was able to determine that the root cause of the vibration was the deterioration of the marriage bolts.
“Unfortunately, deterioration of the marriage bolts can be difficult to diagnose and correct as the rotor must be sent off to be taken apart and carefully analyzed”, says HPI’s Technical Director. “Correcting the problem at the source will save time and money in the long run. More and more of the older GE Frame 5 turbines are experiencing deterioration of the marriage bolts and it is important that we recognize this problem to keep downtime at a minimum.”