Laars MagnaTherm MGH1600 Installation And Operation Instructions Manual page 21

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