The original article says rotary-vane compressors improve during their first 500 hours of operation, with the gain independently verified by Intertek. It deliberately leaves the exact figure out of the body of the piece. So what is the actual measured number — and how confident should anyone be in it?
If a screw compressor's efficiency declines over time because its sealing clearances open as the bearings wear, the next reasonable question is the obvious one: how fast does this actually happen? What is the rate of decay? Where is the percentage?
