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Re: 25 hp is 25HP


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Posted by buickanddeere on March 26, 2009 at 07:43:18 from (216.183.136.2):

In Reply to: Re: 25 hp electric;how big diesel hp to replace it? posted by Kentb of SWMO on March 26, 2009 at 06:10:12:

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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