// 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

mercury column*D*= Inside diameter of pipe, in. *P*_{1}= Upstream pressure, psia *P*_{2}= Downstream pressure, psia Y = Superexpansibility factor = 1/supercompressibility

factor*C*_{r}= Factor for viscosity, density and temperature*

=

Note: See Table 402.4 for*Y*and*C*for natural gas and_{r}

propane.

*S*= Specific gravity of gas at 60°F and 30-inch mercury

column (0.60 for natural gas, 1.50 for propane),

or=1488μ*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. H _{2}O = 1 psi)

(For SI, see Section 402.4)

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