Bosch Greentherm 9800 SEO 160 Installation And Operating Instructions Manual page 18

18 | Installation instructions
6.1.2 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 2nd stage (low pressure) regulator and the appliance. For details see the current NFPA 54 or NFPA 58.
Required input for 160000 / 199000 BTU/hr for the Greentherm 9800 SE / SEC O. 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).
Pipe Sizing Between Single- or Second-Stage (Low-Pressure) Regulator and Appliance
Nominal Internal
Iron Diameter
Pipe inches inches
1/2 0.622
3/4 0.824
1 1.049
Table 7
CSST Sizing Between Single- or Second-Stage (Low-Pressure) Regulator and Appliance Shutoff Valve
EHD*
10
23 254
25 303
30 521
31 605
Table 8
* EHD = Equivalent Hydraulic Diameter. The greater the value of
EHD, the greater the gas capacity of the tubing.
Tube Sizing Between Single- or Second-Stage (Low-Pressure) Regulator and Appliance
Nominal Internal
Iron Diameter
10
Pipe inches
inches
5/8 0.527
3/4 0.652
Table 9
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.
6 720 817 281 (2017/05)
10 20
291 200
608 418
1150 787
20 30 40
183 151 131
216 177 153
365 297 256
425 344 297
188
329
Length of Pipe, Feet
30 40
160 137
336 287
632 541
Length of Pipe, Feet
50 60
118 107
137 126
227 207
265 241
Length of Pipe, Feet
20 30
129 104
226 182
50 60
122 110 101
255 231 212
480 434 400
70 80
99 94
117 109
191 178
222 208
40
89
155
Greentherm 9800 SEO 160/199 | SECO 199
80 100
94
197
372
90 100
90 85
102 98
169 159
197 186
50
79
138