Gas Pipe Sizing; Section 4 Water Flow And Headloss Data; General Water Flow Information - Bradford White OmniTech BONH1250 Installation And Operation Instructions Manual
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3.B Gas Pipe Sizing
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
Natural Gas
GRAVITY NATURAL GAS
Pipe Size (in.)
NOMINAL PIPE SIZE @ 0.30" W.C. PRESSURE DROP
Nominal:
2"
2½"
Actual ID: 2.067" 2.469" 3.068"
Length (ft)
Capacity in Cubic Feet of Gas per Hour
10
4,020
6,400 11,300 23,100 41,800
20
2,760
4,400
30
2,220
3,530
40
1,900
3,020
50
1,680
2,680
Nominal:
2
Actual ID:
2.067
60
1,520
2,430
Length (ft)
Capacity in Cubic Feet of Gas per Hour
70
1,400
2,230
10
4,020
80
1,300
2,080
20
2,760
90
1,220
1,950
30
2,220
40
1,900
100
1,160
1,840
50
1,680
125
1,020
1,630
60
1,520
150
928
1,480
70
1,400
80
1,300
175
854
1,360
90
1,220
200
794
1,270
100
1,160
150
704
1,120
125
1,020
300
638
1,020
150
928
175
854
350
587
935
200
794
400
546
870
150
704
300
638
NOTES:
Table 8.
Pipe Capacity for Natural Gas
350
587
1. Inlet pressure - Less than 2 psi
400
546
2. Pressure drop - 0.5 in w.c.
Notes:
1. Inlet pressure - Less than 2 psi
3. Specific gravity - 0.60
2. Pressure drop - 0.5 in w.c.
4. Schedule 40 metallic pipe
3. Specific gravity - 0.60
4. Schedule 40 metallic pipe
3"
4"
4.026"
7,780 15,900 28,700
6,250 12,700 23,000
Natural Gas
5,350 10,900 19,700
Pipe Size (in.)
4,740
9,660 17,500
2½
3
4
2.469
3.068
4.026
4,290
8,760 15,800
3,950
8,050 14,600
6,400
11,300
23,100
3,670
7,490 13,600
4,400
7,780
15,900
3,450
7,030 12,700
3,530
6,250
12,700
3,020
5,350
10,900
3,260
6,640 12,000
2,680
4,740
9,660
2,890
5,890 10,600
2,430
4,290
8,760
2,610
5,330
2,230
3,950
8,050
2,080
3,670
7,490
2,410
4,910
1,950
3,450
7,030
2,240
4,560
1,840
3,260
6,640
1,980
4,050
1,630
2,890
5,890
1,800
3,670
1,480
2,610
5,330
1,360
2,410
4,910
1,650
3,370
1,270
2,240
4,560
1,540
3,140
1,120
1,980
4,050
1,020
1,800
3,670
935
1,650
3,370
870
1,540
3,140
SECTION 4 Water Flow and
4.A General Water Flow Information
This appliance is a water-tube design that requires
water flow for operation. Boilers are generally used in
closed systems, so Laars bases the water flow data on
temperature rise (difference between boiler inlet and
5"
outlet temperature.) Water heaters are used in open
5.047"
systems, with new water constantly being introduced
to the system. This brings a constant supply of new
minerals into the system, as well. Minerals can cause
scale to form on the inside surfaces of water heater
systems (heaters, tanks, pipes, valves, and other
components). Laars uses the water-tube design to
its advantage by basing the water flow data on water
hardness, to assist in minimizing mineral buildup in the
5
heater's waterways.
5.047
41,800
28,700
23,000
19,700
17,500
15,800
9,650
14,600
13,600
8,880
12,700
8,260
12,000
7,320
10,600
6,630
9,650
8,880
6,100
8,260
5,680
7,320
6,630
6,100
5,680
Headloss Data
Nominal:
1½
Actual ID:
1.61
Length (ft)
Capacity in Cubic Fe
10
3,520
20
2,420
30
1,940
40
1,660
50
1,480
Nominal:
1½
Actual ID:
1.61
2.067
60
1,340
Length (ft)
Capacity in Cubic Feet of Gas pe
80
1,230
10
3,520
6,790
100
1,140
20
2,420
4,660
125
1,070
30
1,940
3,750
40
1,660
3,210
150
1,010
50
1,480
2,840
175
899
60
1,340
2,570
200
814
80
1,230
2,370
100
1,140
2,200
250
749
125
1,070
2,070
300
697
150
1,010
1,950
350
618
175
899
1,730
400
560
200
814
1,570
250
749
1,440
NOTES:
300
697
1,340
1. Inlet pressure - 11.0 in w.c.
350
618
1,190
400
560
1,080
2. Pressure drop - 0.5 in w.c.
Notes:
3. Specific gravity - 1.50
1. Inlet pressure - 11.0 in w.c.
4. Schedule 40 metallic pipe
2. Pressure drop - 0.5 in w.c.
3. Specific gravity - 1.50
5. Intended use - Pipe sizing between si
4. Schedule 40 metallic pipe
or second-stage (low pressure)
5. Intended use - Pipe sizing between single
regulator and appliance.
or second-stage (low pressure)
regulator and appliance.
Page 25
Undiluted
Pipe Siz
2
2½
2.067
2.4
6,790
10,8
4,660
7,4
3,750
5,9
Undiluted Propane
3,210
5,1
Pipe Size (in.)
2,840
4,5
2
2½
3
2.469
3.06
2,570
4,1
2,370
3,7
10,800
19,1
2,200
3,5
7,430
13,1
2,070
3,2
5,970
10,6
5,110
9,03
1,950
3,1
4,530
8,00
1,730
2,7
4,100
7,25
1,570
2,5
3,770
6,67
3,510
6,21
1,440
2,3
3,290
5,82
1,340
2,1
3,110
5,50
1,190
1,9
2,760
4,88
1,080
1,7
2,500
4,42
2,300
4,06
2,140
3,78
1,900
3,35
1,720
3,04
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