4.9.2 Gas Line Sizing Tables For Lp Gas - Bosch 940 ES Installation And Operating Instructions Manual

4.9.2 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 of is for pipe
sizing between the 2nd stage (low pressure) regulator and the appliance. For details see the current NFPA 54 or NFPA 58.
Specified pipe lengths are for one 940 ES which has a maximum input of 199,000. 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).
Nominal Internal
Iron Diameter
Pipe inches inches
1/2 0.622
3/4 0.824
1 1.049
Table 28
Tube size, Length of Corrugated Stainless Steel Tubing (CSST), Feet
inches
EHD* 10
3/4 23 254
3/4 23 303
1 30 521
1 31 605
Table 29
* 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 30
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.
940 ES – 6 720 644 930 (2019/09)
Length of Black iron Pipe, Feet
10 20
291 200
608 418
1150 787
20 30
183 151
216 177
365 297
425 344
Length of Semirigid (soft) Copper ACR Tubing, Feet
10
188
329
30 40 50
160 137 122
336 287 255
632 541 480
40 50
131 118
153 137
256 227
297 265
20 30
129 104
226 182
60 80
110 101
231 212
434 400
60 70 80
107 99 94
126 117 109
207 191 178
241 222 208
40
89
155
Installation instructions
100
94
197
372
90 100
90 85
102 98
169 159
197 186
50
79
138
39