Estimating compressor CFM based on pump-up time....
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- Опубліковано 10 лют 2025
- Here I use a formula to calculate the estimated compressor capacity in CFM, based on the time required to raise the receiver pressure from 70 to 100 PSI.
This is an estimate only. It is only as good as the instruments used to measure pressure and time. The gauges on these two units are NOT precision instruments so the estimate may be significantly inaccurate.
The formula came from this website: www.cprindustri...
Next time you have a chance, measure the performance of your consumer-grade imported compressor and see if it really lives up to the stickers on it. :)
Thanks!
David
Hi there.
Hay just wondering do you have any videos of that big compressor of yours during the day where we can see it properly?
I grew a tail and am running in circles chasing it.. HOW do I figure out how long a 5 gallon air tank will power a 40CFM paint gun at 50PSI??? I can get between 100 and 125PSI stored in the 5 gallon spare tank.
Can you post a video of the brake compressor in good light ? I would love to see it. Thanks
Mike, here is a video of it before it was moved to the shed area: ua-cam.com/video/0b5fpadwULI/v-deo.html
That vintage compressor is almost 60 years old and you still using do u think is that dangerous ????
Hi Raul. Yes and no. It could be dangerous, however the history of it gives me some confidence. It had an always-open drain orifice keeping it blown down. It also had been in daily use for its entire life, with no periods of sitting.
When we had access to the forklift to move it outside to its current location, we hydro tested the tank to 300 PSI without any failure. The compressor cycles off at 100. There is a lot of margin left I am sure.
Be careful with older tanks as they can rust on the inside and cause a big boom.
Types of pulleys and sprockets
That's a 7.5hp WEG is it not?
Matt, the motor on the upright compressor is a WEG; however I believe it was less than 7.5HP. It's been a while and I forgot!
davida1hiwaaynet Yea it looks similar to the 7.5HP they put on the IR 80 gallons.
5.3cfm/hp....yeah, 3.5cfm/hp is the max I have ever found on a piston compressor. I'm guessing that motor is a fair bit bigger than 3hp. 5hp or even 7.5 sounds more likely.
what is the reference to 14.7? And what program did you use to calculate it all?
14.7 is atmospheric pressure at sea level and it needs to be taken into account.
you are so far off with your calculations ...