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If you swap out the vane for one of a lower class, suddenly you can’t make power because you are limited by gas generator (compressor) speed. On the other side, you move the vane ring class to the higher side, Ng slows, and I.T.T. increases. Now potentially, you can’t make power because the redline on I.T.T limits you. This is why the vane must be replaced with a like flow class.

The CTVR will have a class identified on it. The logbooks should also contain the class installed at the last test cell run. Some time should be spent determining what flow class you need. The absolute best way to do this is how we do it at Covington. We have a flow bench where we can measure the flow area of your vane and then measure the flow area of potential replacement vanes. This gives you an apple to apple comparison and provides the most accurate data. We are not the only people who can offer such a service; however, I think everyone needs to know that this kind of information about your vane ring is available. Remember, as we all go through this process, everyone will be limited to what flow class vanes are available in the market. Flow class availability is the potential area that could become difficult for the owner/operator.