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Flow conversion....

Flow conversion....

Flow conversion....

(OP)
Hello,
 I am having to convert several different flow rates for construction.
 I have feet per sec and I am having to convert to standard cubic feet per sec.
 Can someone post an easy conversion please.
Thanks

RE: Flow conversion....

Lynx:

Feet per second (ft/s) is a linear velocity.  Cubic feet per sec (ft3/s) is a volumemetric flow.  They are related as per:

Volumetric flow = (linear velocity)(flow area)

For example, let's take a linear velocity of 8 ft/s in a pipe with an inside diameter of 4 inches:

(1) flow area = (Pi)(diameter)2/4 = (3.14)(4)2/4 = 12.57 in2= 0.087 ft2

(2) Volumetric flow = (8)(0.087) = 0.7 ft3/s

Milton Beychok
(Contact me at www.air-dispersion.com)
.

RE: Flow conversion....

(OP)
Thank You

RE: Flow conversion....

Lynx:

Download a free copy of the units conversion program "CONVERT 4.1" from the web page  www.joshmadison.com/software/convert/

It is an easy to use unit conversion program that will convert the most popular units of distance, temperature, volume, time, speed, mass, etc

RE: Flow conversion....

(OP)
Milton,
 I was just looking over your book "Fundamentals of Stack Gas Dispersion". We are currently building a Flare Gas Recovery unit to eliminate enviromental polution (H2S, etc..)

Thanks again y'all & Perth I downloaded the Convert tool :)

RE: Flow conversion....

I concur with mbeychok but note to convert to standard cubic feet per sec (Qs), you need to correct the flowing temperature(Ta) and pressure (Pa) conditions to standard T - P conditions using the combined gas laws:

PaQa/Ta=PsQs/Ts

where the subscript a refers to actual conditions and the subscript s refers to standard conditions

Also, you may need to correct for compressibility depending on your operating pressure and your working fluid.

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