Gas Line Sizing Tables For Natural Gas - Bosch Therm C 1210 ES Installation And Operating Instructions Manual

4.8.1 Gas Line Sizing Tables for NATURAL GAS

For your convenience see below for an excerpt from gas line sizing tables for a single NG appliance. For details see the current NFPA
54.
Specified pipe lengths are for one C 1210 ES or ESC which have a maximum input rating of 225,000 BTUs. 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 cubic feet per hour. Please contact your local gas supplier for
the energy content of the gas to determine the BTU/hr capacity. Use 1,000 BTU/cubic foot for rough estimations.
Maximum pipe capacity in cubic feet of Natural Gas per hour for gas pressures of 14" W.C. (0.5 psig or 25 mbar) or less and a
pressure drop of 0.3" W.C. (0.75mbar) based on 0.60 specific gravity gas).
Nominal Iron Internal
Pipe Size, Diameter
inches inches
3/4 0.824
1 1.049
1 1/4 1.380
1 1/2 1.610
Table 23
Maximum pipe capacity in cubic feet of Natural Gas per hour for gas pressures of <2.0 psig (55" WC or 138 mbar) and a pressure
drop of 3.0" W.C. (7.5mbar) based on 0.60 specific gravity gas).
Nominal Iron Internal
Pipe Size, Diameter
inches inches
1/2 0.622
3/4 0.824
1 1.049
Table 24
Maximum pipe capacity in cubic feet of Natural Gas per hour for gas pressures of 14" W.C. (0.5 psig or 25 mbar) or less and a
pressure drop of 0.5" W.C. (1.25mbar) based on 0.60 specific gravity gas).
Tube EHD*
size,
inches
1 30
1 31
1 - 1/4 37
1 - 1/4 38
Table 25
* EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.
C 1210ES/ESC – 6 720 644 887 (2022/04)
Length of Black iron Pipe (Schedule 40 Metallic Pipe), Feet
10 20 30
273 188 151
514 353 284
1060 726 583
1580 1090 873
Minimum Gas Pressure 8.0" WC (20 mbar)
Length of Black Iron Pipe (Schedule 40 Metallic Pipe), Feet
10 20 30
454 312 250
949 652 524
1787 1228 986
Length of Corrugated Stainless Steel Tubing (CSST), Feet
10 20 30
330 231 188
383 269 218
639 456 374
746 526 442
40 50 60
129 114 104
243 215 195
499 442 400
747 662 600
40 50 60
214 190 172
448 397 360
844 748 678
40 50 60
162 144 131
188 168 153
325 292 267
386 347 318
Installation instructions
70 80 90
95 89 83
179 167 157
368 343 322
552 514 482
70 80 90
158 147 138
331 308 289
624 580 544
70 80 90
121 113 107
141 132 125
248 232 219
295 277 262
100
79
148
304
455
100
131
273
514
100
101
118
208
249
37