Bosch GWH 260 PN Installation Instructions Manual page 12

Installation instructions
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 (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands.
Copper tubing is prohibited for use with Natural Gas in the Commonwealth of Massachusetts and not recommended
elsewhere.
Follow boxed numbers for piping just one GWH 260 PN (example: ¾" B.I. Natural Gas pipe for 20 ft (6. 1 m). will
handle 190,000 btu's (55.7 kWh). For multiple appliances combine the total btu input load and then refer to
applicable chart below.
Nominal
Iron
Pipe Internal
Size Diameter
inches inches 10
3/4 0.824 278 190
1 1.049 520 350
1 1/4 1.380 1050 730
Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet
Tube
size,
inches EHD*
10 20 30
1/2 18 EHD 82 58 47
3/4 23 EHD 161 116 96
1 30 EHD 330 231 188
1 1/4 37 EHD 639 456 374
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).
N o m ina l
Iro n pipe
s ize
10 20 30
inc he s
1/2 291 200 160 137 122 110 94
3/4 608 418 336 287 255 231 197 175
1 1145 787 632 541 480 434 372 330
Maximum Capacity of Semi-Rigid copper Tubing in
Thousands of BTU per Hour of Undiluted Liquefied
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
- No Additional Allowance is necessary for an ordinary
number of fittings
Fig. 13
12
Length of Black Iron Pipe, Feet
20 30 40 50 60
152 130 115 105
285 245 215 195
590 500 440 400
40 50 60
41 37 34
83 75 68
* EHD = Equivalent Hydraulic Diameter. The greater the
162 144 131
value of EHD, the greater the gas capacity of the tubing
325 292 267
Black Iron Pipe
Lenght of pipe, Feet
40 50 60 80 100 125
84 74
155
292
70 80 90 100 125
96 90 84 79 72
180 170 160 150 130
370 350 320 305 275
* EHD = Equivalent Hydraulic Diameter. The greater the
value of EHD, the greater the gas capacity of the tubing.
Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet
Tube
size
inches
150 200
1/2
67 58
140 120
3/4
265 227
1
1 1/4
Outside
diameter
Inch 10
3/8 39
1/2 92
5/8 199 131 107
3/4 329 216 181 145 131 121 112 104
150 175 200
64 59 55
120 110 100
250 225 210
.
EHD*
10 20 30 40
18 EHD 129 91 74 64
23 EHD 254 183 151 131
30 EHD 521 365 297 256
37 EHD 971 661 528 449
Copper (LP gas only)
Length of Tubing, Feet
20 30 40 50 60 70
26 21 19 _ _ _
62 50 41 37 35 31
90 79 72 67
50 60
58 53
118 107
227 207
397 359
80 90 100
_ _ _
29 27 26
62 59 55
95 90
6 720 608 126