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Bosch Greentherm 9800 SE 160/199 Manual page 30

Indoor residential and comme rcial tankless water heaters
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30 | Installation instructions
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 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. 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 13
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 14
* 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
Pipe
inches
inches
5/8
0.527
3/4
0.652
Table 15
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.
6 720 816 815 (2016/10)
10
20
291
200
608
418
1150
787
20
30
40
183
151
131
216
177
153
365
297
256
425
344
297
10
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 SE 160/199 | SEC 199
80
100
94
197
372
90
100
90
85
102
98
169
159
197
186
50
79
138

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