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Bosch Greentherm T9900 SE 160 Installation And Operating Instructions Manual page 35

Indoor residential tankless water heaters, 160 000/199 000 btu- natural gas 160 000/199 000 btu - liquefied petroleum lp gas
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4.8.2 Gas Line Sizing Tables for LP GAS
For your convenience, see below 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 T9900 SE/i. The gas supply system must be sized for the
combined total maximum BTU/hr load requirements of all gas appliances running simultaneously.
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 14 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).
CSST Sizing Between Single- or Second-Stage (Low-Pressure) Regulator and Appliance Shutoff Valve
EHD*
Length of Corrugated Stainless Steel Tubing (CSST), Feet
10
20
23
254
183
25
303
216
30
521
365
31
605
425
Table 15 Maximum capacity in thousands of BTU of the gas supply pipe 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).
* 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
Length of Semirigid Copper Tubing, Feet
tube
Diameter
10
inches
inches
1/2
0.527
188
5/8
0.652
329
Table 16 Maximum capacity in thousands of BTU of the gas supply pipe 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).
* Source National Fuel Gas Code NFPA 54, ANSI Z223.1 - No Additional Allowance is necessary for an ordinary number of fittings.
Greentherm T9900 SE/i – 6 720 813 635 (2019/03)
Length of Black Iron Pipe (Schedule 40 Metallic Pipe), Feet
10
20
291
200
608
418
1150
787
30
40
151
131
177
153
297
256
344
297
20
129
226
30
40
50
160
137
122
336
287
255
632
541
480
50
60
118
107
137
126
227
207
265
241
30
104
182
Installation instructions
60
80
110
101
231
212
434
400
70
80
90
99
94
90
117
109
102
191
178
169
222
208
197
40
89
155
100
94
197
372
100
85
98
159
186
50
79
138
35

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