If the compressor is currently being operated with a 25HP motor. Then the compressor only requires 25-27.5 HP to run steady state. Where the confusion arises is that a 25HP electric motor can make 50-60HP for brief periods of time. While these brief demands can be handled with the electric motor. These overloads will bring a 25HP gas or diesel to a quick stall. Hence a 40Hp minimum diesel engine with good torque rise is required to replace a 25HP electric motor. This will handle a brief torque demands a "50HP" peak load requires. A 40-50HP turbo diesel will loaf along at 25HP burning less fuel than a 50HP natural aspirated diesel. The turbo engine doesn't pump extra air when it isn't required. Being it's a reciprocating compressor that is always spinning at 100% speed. There is no real surge when the unloaded calls for air. Compared to rolling a reciprocating compressor from 0 to full rated rpms. 40HP is lots and 50HP is wasting fuel. A 25HP diesel running a max output with a wee trace of black in the exhaust. Will burn less fuel than a 50HP diesel on the same 25HP load. Ask jdemaris to backup the data.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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