Air compressor volume question

[gygeneral]

I have a single stage compressor rated at 18cfm @ 100psi. I want to get an HVLP spray gun, most guns need around 15CFM at 25-30psi. My question is, would my compressor still produce th rated CFM at 30PSI? I assume I would scale down the PSI at the gun with a regulator but what the CFM does at that pressure is stumping me.
Thanks

 

[tboy]

I run the regulator on my compressor wide open (for me the tanks cycles around 125 psi) and regulate with a quality regulator at the gun. Line pressure to the gun is roughly 125 psi depending on the cycle of the compressor.

If your compressor can handle 18 cfm @ 100 psi it will have no trouble with 15 cfm at the gun

 

[FMB4]

Some sources say that you should multiply the required tool cfm by 1.5 (in your case this = 22.5 cfm) which your compressor should handle with ease. However, you have not mentioned the tank size of your A comp. The typical comp has a 20 gallon tank and if this is case with your unit then you'll be OK. If you're running a much smaller tank (i.e. a pancake, etc) then you may have problems.

 

[gygeneral]

Thanks, my tank is a 60 gal tank, so it appears I'll be ok. I wasn't sure if the volume changes with the pressure.

 

[FMB4]

I wasn't sure if the volume changes with the pressure.

Cfm does change with the pressure.

What is Air Compressor CFM? Calculate CFM by Own- Tool Explainer

Do you have an air compressor or want to buy. You have to know first, what is air compressor CFM and How to calculate the air compresor CFM.

www.toolexplainer.com

 

[mikedodge]

To answer your question yes, at lower psi available cfm goes up a bit.

 

[Spareparts]

Lower Pressure@ Lower CFM = longer time before recycle

 

[nadogail]

I don't think you will have a problem using that compressor to feed that spray gun.\