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Old 03-23-2010, 05:42 PM
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Yet another Air Compressor Piping Question.....

I have a 3/4" outlet on my Ingersoll Rand 7.5HP 80 Gallon compressor that goes to a 3/4" copper piping system.

However, the inlet / outlet on my (free) Permea air filters are only a 1/4"

Is this big of a step down going to negatively impact the air volume the system produces? I have one filter located between the air compressor and dryer and one filter located between the dryer and air pressure regulator.

I will be operating various air tools, spray guns, media blasters, etc.... The compressor puts out 24 CFM @ 175PSI

Should I get rid of these air filters and buy ones that are at least 3/8" or 1/2" even ?

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Old 03-23-2010, 06:47 PM
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To give you an idea of how restrictive the 1/4" sizing is:

1/4" schedule 40 pipe =
max recommended flow rate of 20 scfm@150 psi
max recommended flow rate of 13 scfm@100psi

3/4" schedule 40 pipe =
max recommended flow rate of 115 scfm@150psi
max recommended flow rate of 80 scfm@100psi


source: http://www.engineersedge.com/pipe_flow_capacity.htm

I am sure Old Red will jump right in here and correct me about this.
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Old 03-25-2010, 09:57 AM
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That answers my questions....my 1/4" air filters are going up on Ebay and I already bought some Numatics 1/2" ones. Thanks!


Quote:
Originally Posted by Old Fool
To give you an idea of how restrictive the 1/4" sizing is:

1/4" schedule 40 pipe =
max recommended flow rate of 20 scfm@150 psi
max recommended flow rate of 13 scfm@100psi

3/4" schedule 40 pipe =
max recommended flow rate of 115 scfm@150psi
max recommended flow rate of 80 scfm@100psi


source: http://www.engineersedge.com/pipe_flow_capacity.htm

I am sure Old Red will jump right in here and correct me about this.
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