Laars MagnaTherm MGH1600 Installation And Operation Instructions For page 25

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