Parker Hannifin Corporation
Parflex Division
Ravenna, Ohio
Bulletin No. 4660-PGP2T
58
Parflex
®
Flexible Gas Piping System
Design and Installation GuideSection 7.0 Sizing Tables
7.2 Schedule 40 Metallic Pipe Table
Table 17
Maximum Capacity of Steel IPS Pipe in Cubic Feet per Hour
Gas Pressure: 0.5 psig oe less; Pressure Drop: 0.5 psig
(Based on a 0.60 Specific Gravity Gas)
Pipe Size
(in)
Diameter
(in)
10 20 30 40 50 60 70 80 90 100 125 150 175 200
1/4 0.36
43 29 24 20 18 16 15 14 13 12 11 10 9 8
3/8 0.49
95 65 52 45 40 36 33 31 29 27 24 22 20 19
1/2 0.62
175 120 97 82 73 66 61 57 53 50 44 40 37 35
3/4 0.82
360 250 200 170 151 138 125 118 110 103 93 84 77 72
1 1.05
680 465 375 320 285 260 240 220 205 195 175 160 145 135
1-1/4 1.38
1400 950 770 660 580 530 490 460 430 400 360 325 300 280
1-1/2 1.61
2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430
2 2.07
3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 1020 950 850 800
2-1/2 2.47
6300 4350 3520 3000 2650 2400 2250 2050 1950 1850 1650 1500 1370 1280
3 3.07
11000 7700 6250 5300 4750 4300 3900 3700 3450 3250 2950 2650 2450 2280
4 4.03
23000 15800 12800 10900 9700 8800 8100 7500 7200 6700 6000 5500 5000 4600
* Table reproduced from National Fuel Gas Code NFPA-54.
Specific Gravity Factor — Systems that are to be supplied with a gas of a specific gravity other than 0.60 for natural
gas or 1.52 for propane shall apply a specific gravity factor. This conversion is accomplished by multiplying the
flow capacities given in Tables 1 through 13 and on the pressure drop graph by the appropriate multiplier shown
in the table below. If the exact specific gravity is not shown in the table, use the next higher specific gravity
shown.
Specific
Gravity
Conversion
Multiplier
Specific
Gravity
Conversion
Multiplier
0.35 1.31 1.00 0.78
0.40 1.23 1.10 0.74
0.45 1.16 1.20 0.71
0.50 1.10 1.30 0.68
0.55 1.04 1.40 0.66
0.60 1.00 1.50 0.63
0.65 0.96 1.60 0.61
0.70 0.93 1.70 0.59
0.75 0.90 1.80 0.58
0.80 0.87 1.90 0.56
0.85 0.84 2.00 0.55
0.90 0.82 2.10 0.54
7.3 Specific Gravity
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