An air compressor is a machine that compresses air. This increases the pressure of the gas and makes it easier to transport via pipes or tubes. Air compressors can be powered by an electric motor, diesel engine, gasoline engine or steam turbine. The amount of CFM (cubic feet per minute) generated by an air compressor varies depending on the power source and RPMs (revolutions per minute). The CFM formula is: CFM = (Horsepower) x (RPM) x (Area of Nozzle). Here are seven ways for calculating average CFM output in various conditions:
Idle CFM
Since the compressor is idling, it means that the rpm and horsepower are low, compared to when they are running at high speeds. The power source will make a difference on how much air pressure you will get because an electric motor might not be as powerful as a diesel engine or steam turbine. When using idle CFM to compare differing power sources, you will need to know the CFM rating of each engine. If you should need effective information about air compressor, you can check out drrrunk shopping
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Maximum Idle CFM
The maximum idle CFM is the amount of air that can be pushed by the compressor when it is idling at a low rpm. This would be about one-tenth of the full load capacity of the compressor.
Maximum Full Load CFM
The maximum full load CFM is the amount of air that can be pushed by the compressor when it is pulling a big load and running at high speeds. The goal of this formula is to find out how much pressure you will get if you have too much air for your pipes, or too much air for your tool.
Motor Full Load CFM
This is the motor full load CFM and it calculates the amount of pressure that an electric motor will produce when running at full load capacity. This only runs on electricity and cannot use a diesel engine, so if you need to run off gas or steam, then this formula will not work.
Net BHP Full Load CFM
BHP stands for horsepower and it calculates the amount of pressure that an engine running in full load production capacity will produce. This is actually a combination of formulas #1, #2, and #3 because this takes into consideration idle rpm, nozzles, and electric motor, diesel engine or steam turbine. Also read how to use plam nailer.
Determining CFM based on engine rpm
You can determine the CFM of an electric motor, diesel engine or steam turbine that you are using for your air compressor when it is idling, running at full load capacity, or working under a heavy load. You will need to find out the engine horsepower, rpm and nozzle area. Then put them in the CFM formula to get your answer.
Finding CFM with a load
Finding CFM when you already have the engine rpm is where this formula comes into play because it will give you an idea of how much air pressure your compressor can push under a specific load. You will need to know the engine rpm, nozzle area, and the CFM rating of your compressor motor.
Final Words
If you're looking to calculate the CFM (Cubic Feet per Minute) of an air compressor, check out this list. It includes formulas and examples for calculating CFM in various conditions. The more you know about how your engine works when it's at different speeds or running a heavy load, the better equipped you'll be to find the right size compressor for your needs!
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