// CODE SNIPPET
A.4 Use of Sizing Equations
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Capacities of smooth wall pipe or tubing can also be determined by using the following formulae:
- High Pressure [1.5 psi (10.3 kPa) and above]:
- Low Pressure [Less than 1.5 psi (10.3 kPa)]:
where: Q = Rate, cubic feet per hour at 60°F and 30-inch
D = Inside diameter of pipe, in. P1 = Upstream pressure, psia P2 = Downstream pressure, psia Y = Superexpansibility factor = 1/supercompressibility
Cr = Factor for viscosity, density and temperature*
Note: See Table 402.4 for Y and Cr for natural gas and
S = Specific gravity of gas at 60°F and 30-inch mercury
column (0.60 for natural gas, 1.50 for propane),
T = Absolute temperature, °F or = t + 460 t = Temperature, °F Z = Viscosity of gas, centipoise (0.012 for natural gas,
0.008 for propane), or= 1488μ
fba = Base friction factor for air at 60°F (CF= 1) L = Length of pipe, ft ΔH = Pressure drop, in. w.c. (27.7 in. H2O = 1 psi)
(For SI, see Section 402.4)
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