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#1
08-27-2008, 06:14 AM
 ChrisLC Guest Posts: n/a
convert pounds per hour to CFM

Can lbs/hr be converted into Cubic Feet per minute? If so, what is the formula? THANKS
#2
08-27-2008, 07:28 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,714 Rep Power: 17
Re: convert pounds per hour to CFM

Quote:
 Originally Posted by ChrisLC Can lbs/hr be converted into Cubic Feet per minute? If so, what is the formula? THANKS
Hours to minutes is easy; factor of 60.

Pound <--> cubic feet is a problem. I think it is obvious that a cubic foot of air, water, and lead have different weights. You have to know the material and measure its density or look it up in a reference. For gases, you HAVE to specify temperature and pressure; the concept of volume is meaningless without it. For liquids and solids, density is a funtion of temperature and needs to be specified.
#3
11-18-2009, 02:53 PM
 Zimmermann Guest Posts: n/a
Re: convert pounds per hour to CFM

Quote:
 Originally Posted by ChrisLC Can lbs/hr be converted into Cubic Feet per minute? If so, what is the formula? THANKS
Convert lbs/hr air into cubic feet per hour.
#4
11-18-2009, 03:33 PM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,714 Rep Power: 17
Re: convert pounds per hour to CFM

Quote:
 Originally Posted by Zimmermann Convert lbs/hr air into cubic feet per hour.
You have to know the density of the air (which in turn depends on temperature, pressure, and moisture content.)
#5
02-04-2010, 05:30 AM
 Unregistered Guest Posts: n/a
Re: Convert psi to cf/hr

If I have a 4" line reduced to 3" at the end with 750psi how do I fiqure cf/hr.
#6
06-13-2010, 01:17 PM
 Unregistered Guest Posts: n/a
Re: convert pounds per hour to CFM

Quote:
 Originally Posted by ChrisLC Can lbs/hr be converted into Cubic Feet per minute? If so, what is the formula? THANKS
what is the answer ? thanks
#7
06-13-2010, 02:20 PM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,714 Rep Power: 17
Re: convert pounds per hour to CFM

Quote:
 Originally Posted by Unregistered what is the answer ? thanks
The hour converts into 60 minutes.
To convert pounds to cubic feet, you need the density of the gas. That will depend on what the gas is, and the temperature and pressure.
#8
11-08-2010, 02:59 PM
 Unregistered Guest Posts: n/a
Re: convert pounds per hour to CFM

to convert lbs of air to cfm rationalize around it.....

one cubic foot of air weighs .075 lbs

so multiply one cubic foot by .075lbs that will cancel out cubic feet and the result will be pounds per minute....

then divide that by 60 since there are 60 minutes in one hour...

you can reverse the calculation to convert cfm to pounds per hour

any question reach me at [link removedl]

amateur engineer

hvac technician by ocupation
#9
06-19-2012, 03:43 PM
 junqueira luciano Guest Posts: n/a
Re: convert pounds per hour to CFM

how many cfm i need to lift 1 pound

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