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#1
08-05-2008, 06:15 AM
 airborn Guest Posts: n/a
Air Pressur Conversion - LPM to CFM (or ACFM)

Flow Rate Conversion [volume] sanity check...

I'm trying to measure small volume CFM (or ACFM) through an air line under pressure.

I have a liter/min flowmeter gauge. IF I convert the LPM to CFM
on the conversion WWW site...is this ACFM or SCFM ? I'm assuming SCFM...but the conversion says just "CFM".

Don't I have to factor in SCFM for my location (1-SCFM = about 1.064 ACFM for my location @ 75-deg F). Thanks !
#2
08-05-2008, 08:51 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: Air Pressur Conversion - LPM to CFM (or ACFM)

Quote:
 Originally Posted by airborn Flow Rate Conversion [volume] sanity check... I'm trying to measure small volume CFM (or ACFM) through an air line under pressure. I have a liter/min flowmeter gauge. IF I convert the LPM to CFM on the conversion WWW site...is this ACFM or SCFM ? I'm assuming SCFM...but the conversion says just "CFM". Don't I have to factor in SCFM for my location (1-SCFM = about 1.064 ACFM for my location @ 75-deg F). Thanks !
You need to know what you are trying to measure and what your instrument actually measures. The volume of a gas is a function of temperature and pressure. A box that holds 1 cubic foot holds 28.3495 L; that is a simple volume conversion. However, the amount of gas in that box is complex; it is usually restated to standard temperature and pressure, and is really an air mass, disguised.

*Metric gas measures normally use "normal," a pressure of 101.325 kPa and 0 °C, while foot based measures use 101.325 kPa and several (non!) "standard" temperatures which differ by industry. Do you know what "standard" in scfm means in your industry?

*Compressed air volume is almost always measured as "free air" at the intake with corrections for pressure and temperature; it is NOT measured as a volume in the compressed state, but pressure is measured there. Do you know if your flow meter is calibrated to read equivalent free air or is it calibrated to flow at pressure?

Finally, do you want flow at free air conditions or at pressure?
#3
11-08-2009, 10:42 PM
 Unregistered Guest Posts: n/a
Re: Air Pressur Conversion - LPM to CFM (or ACFM)

what is mean by lpm
#4
11-09-2009, 03:21 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: Air Pressur Conversion - LPM to CFM (or ACFM)

Quote:
 Originally Posted by Unregistered what is mean by lpm
I assume liters per minute (should be L/min)
#5
12-03-2009, 04:03 AM
 Unregistered Guest Posts: n/a
IN HVAC -CMH to liter

how to convert in HVAC CMH to water quantity in liter
#6
12-03-2009, 07:22 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: IN HVAC -CMH to liter

Quote:
 Originally Posted by Unregistered how to convert in HVAC CMH to water quantity in liter
depends on what CMH means. If it is cubic meters per hour (m³/h is the proper symbol), there are 1000 L in 1 m³.
#7
07-04-2011, 04:26 AM
 Unregistered Guest Posts: n/a
Re: Air Pressur Conversion - LPM to CFM (or ACFM)

Quote:
 Originally Posted by Unregistered what is mean by lpm
230lpm to cfm
#8
07-04-2011, 08:59 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: Air Pressur Conversion - LPM to CFM (or ACFM)

Quote:
 Originally Posted by Unregistered 230lpm to cfm
see post #2

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