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### Babcock Steam Flow Rate Formula and Calculator

Babcock Steam Flow Rate Formula and Calculator

An empirical equation for steam flow is the Babcock formula. It can also be used to calculate the pressure drop in steam piping.

A version of the Babcock formula in USCS (Imperial) units is as follows:

Equation 1
ΔP = 0.47 ( ( D + 3.6 ) / D6 ) ω2 L ν

Where:

ΔP = pressure drop, psig
ω = mass flow rate, lb/s
L = pipe length, ft
D = pipe inside diameter, in
ν = specific volume, ft3/ lb

In SI units, the Babcock formula is as follows:

Equation 2
ΔP = ( 8.755 x 109 ) ( D + 3.6 ) / D6 ω2 L ν

Where:

ΔP = pressure drop, kPa
ω = mass flow rate, kg/s
L = pipe length, m
D = pipe inside diameter, mm
ν = specific volume, m3/ kg

Several other pressure drop equations are used in steam piping calculations, including the Spitzglass and Fritzche formulas. Generally, because of their ease of use, charts are used to determine the pressure drop in steam piping.

Related:

Reference:

• Piping Calculations Manual,
E. Shashi Menon
SYSTEK Technologies, Inc