Natural Gas Sizing
Low pressure (1.5 psig and below)
Piping Material Sch 40 Black Steel PICK PIPE TYPE
L = LENGTH OF PIPE IN FEET = 3000 FEET Sch 40 Black Steel
SIZE CFH Pipe ID Plastic Pipe SDR 11.0
1/2" 9 0.662 Copper Pipe
3/4" 16 0.824
1" 30 1.049
1-1/4" 62 1.380
1-1/2" 93 1.610
2" 180 2.067
2-1/2" 287 2.469
3" 507 3.068
3-1/2" 762 3.584
4" 1033 4.026
5" 1870 5.047
6" 3027 6.065
8" 6220 7.981
10" 11297 10.020
12" 17885 11.938
Q = RATE, CUBIC FEET PER HOUR AT 60 oF. AND 30" MERCURY COLUMN
D = INSIDE DIAMETER OF PIPE, INCHES
P1 = UPSTREAM PRESSURE, INCHES WATER COLUMN7 IN W/C
6.5
P2 = DOWNSTREAM PRESSURE, Inches WATER COLUMN IN W/C
Cr = FACTOR FOR VISCOSITY, DENSITY AND TEMPERATURE, = 0.00354 ST(Z/S) 0.152
= 0.632856
S = SPECIFIC GRAVITY = 0.6 SPECIFIC GRAVITY
80 TEMP
T = ABSOLUTE TEMPERATURE (DEGRESS RANKIN) + = 540 ABSOLUTE TEMPERTATURE
Y = SUPEREXPANSIBILITY FACTOR = 1 / SUPERCOMPRESSIBILITY FACTOR
Z = VISCOSITY OF GAS, CENTIPOISE (0.012 FOR NATURAL GAS)
PIPE DIAMETER BASED ON
PRESSURE DROP = 0.5 IN W/C
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Pipe Sch 40 Plastic Pipe
Diameter Black Steel SDR 11.0 Copper Pipe
1/2" 0.662 0.660 0.527
3/4" 0.824 0.860 0.875
1" 1.049 1.075 1.125
1-1/4" 1.380 1.328 1.245
1-1/2" 1.610 1.943 1.481
2" 2.067 2.886 1.959
2-1/2" 2.469 3.682 2.435
3" 3.068 5.421 2.907
3-1/2" 3.584 na 3.385
4" 4.026 7.075 3.857
5" 5.047 na 4.085
6" 6.065 5.421 5.741
8" 7.981 7.075 7.583
10" 10.020 8.796 9.449
12" 11.938 10.432 11.315