Q:

# How is LB/HR converted to SCFH?

A:

Pounds per hour (lb/hr) is a mass flow rate, whereas standard cubic feet per hour (SCFH) is a volumetric flow rate measured at a specific temperature and pressure. Therefore, the density of the fluid being measured as well as the temperature and pressure at which the measurement is taken must be known before the conversion can be performed.

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Calculate the density of the fluid. The density of fluids varies depending on the temperature and pressure. Liquid densities are generally less sensitive to temperature and pressure than gases, but for both fluid types the density must be found under specific conditions. Once the density is known, convert the units to pounds per cubic foot (lb/ft^3) using the appropriate conversion factors.

If the fluid is a liquid, the flow rate in standard cubic feet per hour and absolute cubic feet per hour are identical. For gases, the flow rate must be converted to standard units using the standard and absolute air pressure (Pstd and Pact) and temperature (Tstd and Tabs). The relative humidity (phi) and saturation pressure (Psat) at absolute conditions must also be known. The flow rate in standard cubic feet per hour is then the absolute flow rate multiplied by the quantity ((Pact - Psat*phi)*(Tact/Tstd))/Pstd.

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## Related Questions

• A:

To convert from normal cubic meters per hour to cubic feet per minute, it is necessary to convert normal cubic meters per hour to standard cubic feet per minute first. Once the conversion is made, determine the actual pressure and temperature of the flow, and use a conversion equation to find the flow in cubic feet per minute.

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• A:

One pound is equal to approximately 0.45359 kilograms. One kilogram is approximately equal to 2.2046 pounds. Kilograms are a unit of measurement in the International System of Units or the metric system. Pounds are a unit of measurement in the customary system of units or the imperial unit system.

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• A:

Pounds per square inch cannot be converted to ft-lbs because psi is a measurement of pressure, whereas ft-lbs is a measurement of total energy. Neither one is in the International System of Units as a primary form of measurement. Psi and ft-lbs are primarily American and British units of measure.