Bosch Greentherm 9800 SE 160/199 Manual page 29

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.
Required input for 160000 / 199000 BTU/hr for the Greentherm 9800 SE / SEC. 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 <2.0 psig (55" WC or 138 mbar) and a pressure
drop of 3.0" W.C. (7.5 mbar) based on 0.60 specific gravity gas).
Nominal Internal
Iron Pipe Diameter
Size, inches inches
½ 0.622
¾ 0.824
1 1.049
Table 11
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. (7.5 mbar) based on 0.60 specific gravity gas).
EHD* 10
30 828
31 958
37 1,530
Table 12
* EHD = Equivalent Hydraulic Diameter. The greater the value of
EHD, the greater the gas capacity of the tubing.
Greentherm 9800 SE 160/199 | SEC 199
Initial Supply Pressure of 8.0" w.c. or Greater
Length of Black Iron Pipe (Schedule 40 Metallic Pipe), Feet
10 20 30
454 312 250
949 652 524
1787 1228 986
Initial Supply Pressure of 8.0" w.c. or Greater
Length of Corrugated Stainless Steel Tubing (CSST), Feet
20 30 40
580 471 407
672 546 471
1,090 895 778
40 50 60
214 190 172
448 397 360
844 748 678
50 60 70
363 330 305
421 383 355
698 639 593
Installation instructions | 29
70 80 90
158 147 138
331 308 289
624 580 544
80 90
285 268
331 311
555 524
6 720 816 815 (2016/10)
100
131
273
514
100
251
295
498