Bosch 520-HN-N User Instructions 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 520 HN (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
1 1.049 520
1 1/4 1.380 105 0 730
Length of Flexible Corrugated Stainless Steel Tub ing (CSST), Feet
Tube
size,
inches EHD*
10 20
1/2 18 E HD 82 58
3/4 23 E HD 161 116
1 30 E HD 330 231
1 1/4 37 E HD 639 456
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).
Nominal
Iron pipe
size
10 20
inches
1/2 291 200 160 137 122 110
3/4 608 418 336 287 255 231 197
1 1145 787 632 541 480 434 372
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. 14
12
Length of Black Iron Pipe, Feet
20 30 40 50 60
190 152 130 115 105
350 285 245 215 195
590 500 440 400
30 40 50 60
47 41 37 34
96 83 75 68
188 162 144 131
374 325 292 267
Black Iron Pipe
Lenght of pipe, Feet
30 40 50 60 80 100
94 84
175
330
70 80 90 100
96 90 84 79
180 170 160 150
370 350 320 305
* EHD = Equivalent Hydraulic Diameter. The greater the
value of EHD, the greater the gas capacity of the tubing
* EHD = Equivalent Hydraulic Diameter. The greater the
value of EHD, the greater the gas capacity of the tubing.
Tube
size
inches
125 150 200
1/2
74 67 58
3/4
155 140 120
1
292 265 227
1 1/4
Out side
diameter
Inch 10 20
3/8 39 26
1/2 92 62
5/8 199 131
3/4 329 216
125 150 175 200
72 64 59 55
130 120 110 100
275 250 225 210
.
Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet
E HD*
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
Length of Tubing, Feet
30 40 50 60 70
_ _ _
21 19
50 41 37 35 31
107 90 79 72 67
181 145 131 121 112 104 95
50 60
58 53
118 107
227 207
397 359
80 90 100
_ _ _
29 27 26
62 59 55
90
6 720 644 942