Gas Pipe Calculator
D =
Q =
P1 =
P2 =
Y =
Cr =
L =
Help
D = inside diameter of pipe
Q = input rate appliance(s), cubic feet per hour at 60°F and 30 in. mercury column
P 1 = upstream pressure, psia (P1 + 14.7)
P 2 = downstream pressure, psia (P2 + 14.7)
DP = P1 - P2
L = equivalent length of pipe, ft
H = pressure drop, in. w.c. (27.7 in. H2O = 1 psi)
Formula Factors
Gas. Natural Gas. Undiluted Propane
Cr. 0.6094. 1.2462
Y. 0.9992. 0.991
From International Fuel Gas Code
IFGC 402.4 Equation 4-2
Contributed by Mark Sweeney
Examples
Here are the calculated results:
D: 6.065
Q: 250,000
P1: 29.7
P2: 28.6941351101
Y: 0.9992
Cr: 0.6094
L: 100
Example 2:
D: 0.622
Q: 645.231480698
P1: 18.7
P2: 17
Y: 0.9992
Cr: 0.6094
L: 100
Keywords
D
Q
P1
P2
Y
Cr
L
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Pressure drop
length
pipe
pressure
input rate appliance
diameter
