PeerlessBoilers 211A Series Installation, Operation & Maintenance Manual page 33

Table 7.1: Capacity of Gas Supply Pipe in Cubic Feet (Cubic Meters) Per Hour of Natural Gas for
0.3 inch (75 Pa) Drop.
Pipe Length 1-1/4" Pipe
Feet Meters Foot 3 Meter
10 3.0 1050 30
20 6.1 730 21
30 9.1 590 17
40 12.2 500 14
50 15.2 440 12
60 18.3 400 11
70 21.3 350 10
90 27.4 320
100 30.5 305
150 45.7 250
Above ratings based on natural gas with specific gravity of 0.60 allowing pressure drop of 0.3 inches (75 Pa). No allowance
is needed for pipe fittings. Use the following multipliers on above capacities for specific gravity other than 0.60:
Specific Gravity
Multiply Capacity by:
1-1/2" Pipe 2" Pipe
3 Foot 3 Meter 3 Foot 3
1,600 45 3,050
1,100 31 2,100
890 25 1,650
760 22 1,450
670 19 1,270
610 17 1,150
560 16 1,050
9 490 14 930
9 460 13 870
7 380 11 710
0.50
1.10
2-1/2" Pipe
Meter 3 Foot 3 Meter 3 Foot
86 4,800 136 8,500
59 3,300 93 5,900
47 2,700 76 4,700
41 2,300 65 4,100
36 2,000 57 3,600
33 1,850 52 3,250
30 1,700 48 3,000
26 1,500 42 2,600
25 1,400 40 2,500
20 1,130 32 2,000
0.55 0.60
1.04 1.00
CONNECT GAS PIPING
3" Pipe 4" Pipe
3 Meter 3 Foot 3 Meter 3
241 17,500 496
167 12,000 340
133 9,700 275
116 8,300 235
102 7,400 210
92 6,800 193
85 6,200 176
74 5,400 153
71 5,100 144
57 4,100 116
0.65
.962
6" Pipe
Foot 3 Meter 3
44,000 1246
31,000 878
25,000 708
22,000 623
20,000 566
18,000 510
17,000 481
15,000 425
14,000 396
11,500 326
0.70
.926
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