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#70 PSI TO BAR MANUAL#

“Having not been able to find a conversion table, I had to rely on the Ideal Gas Law: PxV = nRT The contributor writes (I have re-formatted somewhat)… To paraphrase the contributor, “it’s a very coarse” calculation.”īut, at least, using the formula, you can get some idea of how much compressed air your air compressor will provide at a variety of pressures. The anonymous contributor is not certain of the pinpoint accuracy of his formula. An anonymous contributor provided the following insight regarding calculating cfm at different pressures. The air compressor PUMP will still operate at the factory set cut-in and cut-off pressures of 90+ PSIĬalculating CFM is complex. The fact that you may be USING compressed air from the tank outlet at 45 PSI doesn’t mean that the compressor PUMP will be operating at 45 PSI

#70 PSI TO BAR MANUAL#

The compressor PUMP CFM is what’s specified in the user manual or the product specification. The rest of this article speaks to the levels of confusion that the subject of PSI versus CFM for air compressors can cause! The relationship between CFM and PSI for those 2 different parts of the pneumatic system are COMPLETELY different.

Are they talking about the CFM versus PSI on the Air TANK outlet / Air Pressure Regulator Outlet?.

Are they talking about the CFM versus PSI on the Air Compressor PUMP outlet?.

Remember – when you read lots of “misinformation” out there about PSI vs CFM of an “air compressor” without the writer having specified where in the system the CFM and PSI are being measured, there’s space for EVERYONE to be right, and EVERYONE to be wrong all at the same time. Remember: Ask which PSI vs CFM relationship they’re talking about! Is a whole other equation which is far more to do with the mechanical configuration of the pump which will be designed to operate at a specific range of PSI and CFM and therefore the relationship of cubic feet per minute to PSI won’t even approximately be linear!

If PSI halves, CFM doubles CFM to PSI at the compressor pump:.PSI to CFM at the air tank outlet:Īt the air tank outlet the relationship between CFM to PSI is inversely proportional… so to say So… to summarise the cubic feet per minute to psi question – it depends highly on where you’re measuring. The above scenario DOES however rely on the fact that the air compressor PUMP has an AVERAGE CFM of ABOVE x when replenishing air into the air tank at 90-130 PSI. *this is still an approximation as temperature change IS a factor and the air also contains moisture mollecules etc. REGARDLESS of what the CFM of the Air Compressor PUMP is. The CONTINUOUS CFM out of the regulator is now = 2*x (approximately*) If you then adjust the air pressure regulator to 45 PSI and the air in the tank is once again always kept between 90-130 PSI… If a compressed air TANK has a regulator attached to it which is set to 90 PSI and the air in the tank is always kept between 90-130 PSI – lets say that the CONTINUOUS CFM out of the regulator is equal to “x” However… let’s ignore the Air Compressor PUMP for a moment and JUST concentrate on the compressed air TANK. Air Tank Outlet CFM to PSI vs Air Compressor Pump PSI to CFM