Gas Piping, Connections And Gas Regulator - Bosch AquaStar 125HX LP Installation And Operating Instructions Manual

GAS PIPING, CONNECTIONS and Gas Regulator

Before connecting the gas supply, check the rating plate on the right side of the front cover to be sure that the heater is
rated for the same gas to which it will be connected.
In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel
Gas Code ANSI Z223. 1 /NFPA 54.
In Canada: The Installation should conform with CGA B149 INSTALLATION CODES and /or local installation codes.
The gas supply piping should be sized according to the Applicable Plumbing Code for a maximum draw of 117,000 BTUH. First determine
the effective length of the gas supply line by measuring the actual length of piping, and then adding 5 ft. for every elbow or "T" to the actual
length. Use the charts below to determine the pipe diameter necessary to accommodate the BTU demand of the unit. If there are more
gas drawing appliances on the line, size according to the maximum amount of BTU demand.
FOR NATURAL GAS
Maximum Capacity of pipe in Cubic Feet of Gas per Hour
for Gas Pressure of 0.5 Psig or less and a Pressure drop of
0.3 in Water Column.
(Based on a 0.60 Specific Gravity Gas) Btu numbers given
in thousands.
Nominal
Iron
Pipe Internal
Size, Diameter
inches inches 10
1/4 0.364 32
3/8 0.493 72
1/2 0.622 132
3/4 0.824 278
1 1.049 520
1 1/4 1.380 1050
1 1/2 1.610 1600
2 2.067 3050
2 1/2 2.469 4800
3 3.068 8500
4 4.026 17,500 12,000 9,700 8,300
FOR LP GAS
Maximum Capacity of Pipe in Thousands of
BTU per Hour of Undiluted Petroleum Gases
(at 11 inches Water Column Inlet Pressure)
(Based on a Pressure Drop of 0.5 Inch Water
Column).
Maximum Capacity of Semi-Rigid
Tubing in Thousands of BTU per Hour of
Undiluted Liquified Petroleum Gases (at 11
inches Water Column Inlet Pressure)
(Based on a Pressure Drop of 0.5 Inch Water
Column)
* Source National Fuel Gas Code NFPA 54, ANSI Z223. 1 .
10
GAS LINE SIZING
Length of Black Iron Pipe, Feet
20 30 40 50
22 18 15 14
49 40 34 30
92 73 63 56
190 152 130 115
350 285 245 215
730 590 500 440
1100 890 760 670
2100 1650 1450 1270 1150 1050
3300 2700 2300 2000 1850 1700
5900 4700 4100 3600 3250 3000
7,400 6,80 6,200 5,800 5,400 5,100 4,500
Nominal
Iron Pipe
Size,
Inches
Outside
Diameter,
Inch
Follow boxed numbers for piping just one 125 HX
(example: 3/4" B.I. Natural Gas pipe for 30 ft. will handle
152,000 btu's). For multiple appliances combine the total
btu input load and then refer to applicable chart below.
60 70 80 90
12 11 11 10
27 25 23 22
50 46 43 40
105 96 90 84
195 180 170 160
400 370 350 320
610 560 530 490
990 930
1600 1500
2800 2600
Black Iron Pipe
Length of Pipe, Feet
10 20 30 40 50
1/2 275 189 152 129 114 103
3/4 567 693 315 267 237 217 196 185 173
1 107 732 590 504 448 409 378 346 322
1 1/4 220 149 121 103 913 834 771 724 677
1 1/2 330 229 185 155 141 127 118 108 102
2 622 433 346 299 264 239 220 204 192 1811 1606 1496
Length of Tubing, Feet
10 20 30
3/8 39 26 21
1/2 92 62 50
5/8 199 131 107
3/4 329 216 181 145
7/8 501 346 277 233
100 125 150 175
9 8 8 7
21 18 17 15
38 34 31 28
79 72 64 59
150 130 120 110
305 275 250 225
460 410 380 350
870 780 710 650
1400 1250 1130 1050
2500 2200 2000 1850 1700
4,100 3,800 3500
60 70 80 90 100
96 89 83 78
162
307
630
976
Copper
40 50 60 70 80
19 _ _ _ _
41 37 35 31 29
90 79 72 67 62
131 121 112 104
198 187 164 155 146 138
200
6
14
26
55
100
210
320
610
980
125 150
69 63
146 132
275 252
567 511
866 787
90 100
_ _
27 26
59 55
95 90
6 720 606 804