Bradford White Brute MagnaTech BMGV1600 Installation And Operation Instructions Manual page 23

The following are gas line sizing examples from the National Fuel Gas Code. Size your gas lines properly,
based on your installation, and all applicable codes.
SCH 40 METAL PIPE CAPACITY FOR 0.60 SPECIFIC GRAVITY
NOMINAL PIPE SIZE @ 0.30" W.C. PRESSURE DROP
Nominal: 2
Actual ID: 2.067
Length (ft) Capacity in Cubic Feet of Gas per Hour
10 4,020
20 2,760
30 2,220
40 1,900
50 1,680
60 1,520
70 1,400
80 1,300
90 1,220
100 1,160
125 1,020
150 928
175 854
200 794
150 704
300 638
350 587
400 546
Table 12. Pipe Capacity for Natural Gas
SCHED 40 METAL PIPE CAPACITY FOR 1.50 SPECIFIC GRAVITY
UNDILUTED PROPANE
NOMINAL PIPE SIZE @ 11" W.C. INLET AND 0.5" W.C. PRESSURE
Nominal: 1½
Actual ID: 1.61
Length (ft) Capacity in Cubic Feet of Gas per Hour
10 3,520
20 2,420
30 1,940
40 1,660
50 1,480
60 1,340
80 1,230
100 1,140
125 1,070
150 1,010
175 899
200 814
250 749
300 697
350 618
400 560
Table 13. Pipe Capacity for Propane
NATURAL GAS
p ( )
2½ 3
2.469 3.068 4.026
6,400 11,300 23,100
4,400 7,780 15,900
3,530 6,250 12,700
3,020 5,350 10,900
2,680 4,740 9,660
2,430 4,290 8,760
2,230 3,950 8,050
2,080 3,670 7,490
1,950 3,450 7,030
1,840 3,260 6,640
1,630 2,890 5,890
1,480 2,610 5,330
1,360 2,410 4,910
1,270 2,240 4,560
1,120 1,980 4,050
1,020 1,800 3,670
935 1,650 3,370
870 1,540 3,140
DROP
p ( )
2 2½
2.067 2.469 3.068
6,790 10,800 19,100
4,660 7,430 13,100
3,750 5,970 10,600
3,210 5,110 9,030
2,840 4,530 8,000
2,570 4,100 7,250
2,370 3,770 6,670
2,200 3,510 6,210
2,070 3,290 5,820
1,950 3,110 5,500
1,730 2,760 4,880
1,570 2,500 4,420
1,440 2,300 4,060
1,340 2,140 3,780
1,190 1,900 3,350
1,080 1,720 3,040
4 5
5.047
41,800
Notes:
28,700
1. Inlet pressure - Less than 2 psi
23,000
2. Pressure drop - 0.5 in w.c.
19,700
3. Specific gravity - 0.60
17,500
4. Schedule 40 metallic pipe
15,800
14,600
13,600
12,700
12,000
10,600
9,650
8,880
8,260
7,320
6,630
6,100
5,680
3 4
4.026
Notes:
1. Inlet pressure - 11.0 in w.c.
39,000
2. Pressure drop - 0.5 in w.c.
26,800
3. Specific gravity - 1.50
21,500
4. Schedule 40 metallic pipe
18,400
5. Intended use - Pipe sizing between single
16,300
14,800
13,600
124,700
11,900
11,200
9,950
9,010
8,290
7,710
6,840
6,190
or second-stage (low pressure)
regulator and appliance.
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