scfm to mpph

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scfm to mpph

Postby Bobby » Mon Nov 28, 2005 9:07 pm

How do I convert scfm of air to mpph
Bobby
 

Re: scfm to mpph

Postby Guest » Mon Nov 28, 2005 10:17 pm

Bobby wrote:How do I convert scfm of air to mpph


scfm is the flow rate "adjusted" to standard" conditions. The standard pressure is usually 1 atm. but the standard temperature varies by industry and country, but is likely to be 0, 15, or 20 degrees C, or 60, 68, or 70 degrees F. Step one is to use ideal gas law to convert it back to actual cfm at the actual temperature and pressure. (Remember 1 atm is only 1 atm at sea level on a nice day)

Step 2 is the gas must be flowing through some duct or tube with a well defined cross-sectional area. Divide the volumetric flow rate (cfm) by the cross sectional area, in square feet. This gives you the linear flow rate in feet/minute.

Step 3, there are 60 minutes in an hour, and 5280 feet in a mile. Multiply by the ratio 60/5280, which reduces to 1/88 (or divide by 88). 1 mph = 88 ft/min.
Guest
 

Re: scfm to mpph

Postby anotamouse » Thu Jun 16, 2011 1:26 am

WRONG!

SCFM = Standard Cubic Feet per Minute
MPPH = Million Pounds Per Hour

This is a mass flow rate, not a duct velocity.

MPPH = SCFM * (mass of air in Pound/FT^3 at actual conditions) * (60 Minutes / 1 Hour)
anotamouse
 


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