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Pipe Sizing Chart

Pipe Size Requirements for Gaseous Fuel Systems

Maximum Capacity of Pipe in Cubic Feet of Gas per

Hour for Gas Pressures of 0.5 PSIG or less and a

Pressure drop of 0.5” Water Column

(Based on a 0.60 Specific Gravity Gas)
Nominal
Iron Pipe Size
-Inches
Internal
Diameter
-Inches
Length of Pipe-Feet
10
20
30
40
50
60
70
1/4

3/8

1/2

3/4

1

1-1/4

1-1/2

2

2-1/2

3

4
.364

.493

.622

.824

1.049

1.380

1.610

2.067

2.469

3.068

40.26
43

95

175

360

680

1,400

2,100

3,950

6,300

11,000

23,000
29

65

120

250

465

950

1,460

2,750

4,350

7,700

15,800
24

52

97

200

375

770

1,180

2,200

3,520

6,250

12,800
20

45

82

170

320

660

990

1,900

3,000

5,300

10,900
18

40

73

151

285

580

900

1,680

2,650

4,750

9,700
16

36

66

138

260

490

810

1,520

2,400

4,300

8,800
15

33

61

125

240

460

750

1,400

2,250

3,900

8,100
Nominal
Iron Pipe Size
-Inches
Internal
Diameter
-Inches
Length of Pipe-Feet
80
90
100
125
150
175
200
1/4

3/8

1/2

3/4

1

1-1/4

1-1/2

2

2-1/2

3

4
.364

.493

.622

.824

1.049

1.380

1.610

2.067

2.469

3.068

4.026
14

31

57

118

220

460

690

1,300

2,050

3,700

7,500
13

29

53

110

205

430

650

1,220

1,950

3,450

7,200
12

27

50

103

195

400

620

1,150

1,850

3,250

6,700
11

24

44

96

175

360

550

1,020

1,650

2,950

6,000
10

22

40

84

160

325

500

950

1,500

2,650

5,500
9

20

37

77

145

300

460

850

1,370

2,450

5,000
8

19

35

72

135

280

430

800

1,280

2,280

4,600
*Note: Each pipe bend 90° elbow equates to an extra 10 feet of pipe and 45° an extra 5 feet.

*Note: Maximum allowable gas pressure drop from no load to full load is 0.5inches of water column.