How to Determine Air Compressor Capacity

I'm fairly confident that this is correct.

100Nm³/min ( 3,530 CFM ) is the volume per minute of "free air" (air at atmospheric pressure) that could be inhaled / sucked into the compressor inlet.
7Kg/cm² ( 100 psi ) is the delivery pressure of this initial volume once it's been compressed.

Woody

Dear woodygb,

Thank you very much of your answer.

Regards

That is a huge compressor. 100Nm³/min at 7Kg/cm² means you will get outlet pressure & volume at 7Kg/cm².
This is assumed the delivery pressure to a device, such as a shear or nail gun. Inlet pressure assumed to be atmospheric.
FAD (Free Air Delivery) is the actual quantity of compressed air as measured at the discharge of the compressor and
that is a larger number (convert 3500 cfm@100psig to ????cfm@0psig for volume at atmospheric pressure).
What is the application that you are using over 3500 cfm at 100 psig? Industrial building? Mold/plastics manufacturing?

I agree that 100Nm³/min at 7Kg/cm² seems to indicate the output volume and pressure but N is for Newton and when used (improperly) in Nm³, means normal cubic meter, where the gas volume is measured @ "normal" pressure and temperature of 101.325 kPa and 0 °C, not actual temperature and pressure

http://www.mitsuiseiki.co.jp/en/compressor/technical/discharge_air/normal.html

Dear W3ig,

Thank you for your reply,i hv 3 x 100Nm³ at 7kg/cm² centrifugul air compressor is supply to glass production plants. We step down by regulator and control valve to desired air pressure for plant equipments.

Regards

Was that helpful? did it provide you with what you need? I would be happy to assist further if you have any specifics. Of ciurse your best bet will be your vendors that supply your equipment as they have a team of engineers just waiting ti serve you, especially in this economy. Do not be bashful about shopping around. The major manufacturers want every scrap of business they can find. this is also true of their well informed distributirs. you will find WW Grainger staff very helpful if you are stateside US

Good luck, Joe