Bosch 520-PN-N Operation Manual page 13

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 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 20
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. 14
6 720 644 947
Length of Black Iron Pipe, Feet
30 40 50 60 70
152 130 115 105 96
285 245 215 195 180
590 500 440 400 370
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
80 90 100 125 150
90 84 79 72
170 160 150 130 120
350 320 305 275 250
* 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 EHD*
150 200
1/2 18 EHD 129 91
67 58
140 120
3/4 23 EHD 254 183
265 227
1 30 EHD 521 365
1 1/4 37 EHD 971 661
Outside
diameter
Inch 10 20
3/8 39 26
1/2 92 62
5/8 199 131 107
3/4 329 216 181 145 131 121 112 104
Installation instructions
175 200
64 59 55
110 100
225 210
.
10 20 30 40 50
74 64 58
151 131 118 107
297 256 227 207
528 449 397 359
Copper (LP gas only)
Length of Tubing, Feet
30 40 50 60 70 80
21 19 _ _ _
50 41 37 35 31 29
90 79 72 67 62
60
53
90 100
_ _ _
27 26
59 55
95 90
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