Bosch C 950 Installation Manual page 31

4.8.2 Gas Line Sizing Tables for LP GAS
For your convenience see below for an excerpt from gas line sizing tables for a single LP appliance. Their intended use is for pipe sizing between the the
2nd stage (low pressure) regulator and the appliance. For details see the current NFPA 54 or NFPA 58.
Required input for C950 is 175000 BTU/hr and 199000 BTU/hr for the C1050. The gas supply system must be sized for the combined total maximum
BTU/hr load requirements of all gas appliances running simultaneously.
The tables below show the maximum capacity of the gas supply pipe in thousands of BTU per hour of Undiluted LP Gas at 11" W.C (0.4 psig or 27.4
mbar) based on a pressure drop of 0.5" W.C (1.25 mbar).
Internal
Nominal Iron Diameter
Pipe inches inches
1/2 0.622
3/4 0.824
1 1.049
Table 40
Tube size,
inches EHD*
3/4 23
3/4 23
1 30
1 31
Table 41
* EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.
Nominal Iron Internal Diameter
Pipe inches inches
5/8 0.527
3/4 0.652
Table 42
Maximum Capacity of Semi-Rigid (flexible, non corrugated) Tubing in Thousands of BTU/hr 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.
Greentherm
Length of Black iron Pipe (Schedule 40 Metallic Pipe), Feet
10 20
291 200
608 418
1150 787
Length of Corrugated Stainless Steel Tubing (CSST), Feet
10 20 30
254 183 151
303 216 177
521 365 297
605 425 344
10
188
329
30 40 50
160 137 122
336 287 255
632 541 480
40 50 60
131 118 107
153 137 126
256 227 207
297 265 241
Length of Semirigid (soft) Copper ACR Tubing, Feet
20 30
129 104
226 182
Installation instructions | 31
60 80
110 101
231 212
434 400
70 80 90
99 94 90
117 109 102
191 178 169
222 208 197
40
89
155
6 720 805 440 (2014/11)
100
94
197
372
100
85
98
159
186
50
79
138