convert pounds per hour to CFM

Can lbs/hr be converted into Cubic Feet per minute? If so, what is the formula? THANKS

[JohnS]

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.

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.

[JohnS]

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.)

If I have a 4" line reduced to 3" at the end with 750psi how do I fiqure cf/hr.

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

[JohnS]

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.

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


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how many cfm i need to lift 1 pound