The plant air system has two parts. One is a large compressor system driven by a single 400-hp motor. The other is a small compressor that keeps the large system from short-cycling in response to minor pressure drops. Several months ago, an inquiry from the plant manager resulted in replacing the 400-hp motor with an energy-efficient motor. The original had been in service for a long time, so part of the justification was that a new motor would prevent an unplanned system failure. That part ...

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