Bosch C 950 - Page 31

Installation instructions | 31
6 720 805 440 (2014/11)Greentherm
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).
* EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.
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.
Nominal Iron
Pipe inches
Internal
Diameter
inches
Length of Black iron Pipe (Schedule 40 Metallic Pipe), Feet
10 20 30 40 50 60 80 100
1/2 0.622 291 200 160 137 122 110 101 94
3/4 0.824 608 418 336 287 255 231 212 197
1 1.049 1150 787 632 541 480 434 400 372
Table 40
Tube size,
inches
Length of Corrugated Stainless Steel Tubing (CSST), Feet
EHD* 10 20 30 40 50 60 70 80 90 100
3/4 23 254 183 151 131 118 107 99 94 90 85
3/4 23 303 216 177 153 137 126 117 109 102 98
1 30 521 365 297 256 227 207 191 178 169 159
131605 425 344 297 265 241 222 208 197 186
Table 41
Nominal Iron
Pipe inches
Internal Diameter
inches
Length of Semirigid (soft) Copper ACR Tubing, Feet
10 20 30 40 50
5/8 0.527 188 129 104 89 79
3/4 0.652 329 226 182 155 138
Table 42