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Submitted by: Bill - Publisher

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Tough question, BJ. You don't indicate the horsepower of the motor, and that might help. Industry standards suggest that for motors over 10 HP, each HP will generate about 4 CFM of compressed air at 90 PSI. I know that this changes substantially when the motor HP is less than 10. I've also read that using a figure of about 2.2 CFM of air discharge for each horsepower for a compressor under 10 horsepower is common. That source didn't say at what pressure that flow rate was achieved. I've never been able to "nail down" a specific formula for determining the discharge rate of a specific compressor, mostly, I think, as there are so many variables. A host of different manufacturers, different piston sizes for different compressors with the same electric motor horsepower, different belt to sheave ratios and so on. At this point, as noted, over 10 HP I use 4 CFM @ 90 PSI, and under 10 HP I go with 2 CFM per horsepower at around 90 PSI. If someone has a formula to offer us, that would be great. Cheers, Bill

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