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#Air compressor pump series
The air compressor CFM PSI calculator formula is the following:ĬFM = tank volume in cubic feet x standard pressure (ATM) during cycle x cranks per minute.įor example, a 2 HP compressor with a 10-gallon tank rated 5.77 CFM at 90 PSI, like this Hulk silent series EMAX compressor readily available on Amazon. The pump will operate at its factory set cut-in and cut-out pressures around the 90 PSI mark. Also, remember that if you’re using the compressed air, regulated to 30 PSI, this does not mean the compressor’s pump is operating at 30 PSI. If you cannot find this, contact the manufacturer directly to find out.
#Air compressor pump manual
It’s easy to remember that the compressors pump CFM is specified in the user manual or product specification. Are they talking about the CFM and PSI relationship in the tank/regulator outlet or in the pump? The relationship between these two parts of the pneumatic system is completely different.
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You must ensure that any write-ups or calculations you’re using for CFM, or the relationship between CFM and PSI, states wherein the system both are being measured. The reason behind this is simple, the air compressor tank decouples the CFM of the air compressor pump from the CFM flowing out of the air compressor regulator. The CFM and PSI at the outlet of the air compressor tank/regulator have no relationship with the CFM and PSI relationship in the air compressor pump if the CFM of the compressor is below its stated amount of 90 PSI (like in the example provided). Therefore, it is the air compressor tank outlet CFM and PSI relationship that really matters to users.
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This is because each pump will have its mechanical configuration to operate at specific ranges of PSI and CFM. When it comes to the CFM and PSI relationship at the compressor pump, the relationship won’t be near linear. The relationship between CFM & PSI depends highly on where you’re measuring it.Īt the air tank outlet, the relationship between CFM and PSI is inversely proportional and so: This scenario relies on the fact that the air compressor pump has an average CFM above “x” when replenishing the air into the tank at 90-120 PSI. Note: this is an approximation as temperature fluctuations are a key factor, along with the air containing moisture and potential contaminants. If we were to adjust the pressure at the regulator to 30 PSI and the air in the tank is still kept between 90-120 PSI then the continuous CFM out of the regulator is equal to 3*”x”, approximately! We’ll label the continuous CFM out of the regulator as “x”. If the air compressor tank has a regulator attached to is set to 90 PSI while the air tank itself is always kept within 90-120 PSI. This, therefore, indicates the complexity of the relationship between CFM and PSI.Īir Tank Outlet and Pump Relationship Between CFM & PSI If the pressure is changed, or the CFM that the air compressor pump needs to operate at sufficiently, you will have efficiency losses. The air compressor pump is designed to produce air at a certain flow rate and a certain pressure efficiently. Often numerous Engineers try to chip on this relationship but forget which part of the system is in question, the outlet or pump. The relationship between CFM and PSI is not so simple due to the fact that there are temperature fluctuations and pressure changes inside the compressor tank with airflow. Each piece of equipment or tool will have a CFM requirement in order to operate effectively. Too little pressure means you will not be able to complete tasks, while too much pressure can lead to damaged equipment and unexpected malfunctions.īetween CFM and PSI, the two measurements essentially define whether a compressor can meet the demand of your equipment. In terms of compressed air, pressure delivers the force, and horsepower delivers the flow. The compressor must be able to provide the right amount of pressure needed to complete the process. PSI expresses the compressor’s ability to perform a specified amount of work at almost any given time. PSI (pounds per square inch) is the pressure of the air. With insufficient flow, the compressors will require breaks to rebuild pressure in the compressor’s air tank. It basically expresses the amount of flow that is needed and depends on the length of time required to complete tasks. Before we get into the calculations, let’s answer what is the relationship between CFM and PSI? CFM is the flow rate or the compressor’s ability to continue performing tasks over a certain amount of time.