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Bosch C 950 Installation Manual page 31

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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 the
2nd stage (low pressure) regulator and the appliance. For details see the current NFPA 54 or NFPA 58.
Required input for C950 is 175000 BTU/hr and 199000 BTU/hr for the C1050. 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).
Internal
Nominal Iron
Diameter
Pipe inches
inches
1/2
0.622
3/4
0.824
1
1.049
Table 40
Tube size,
inches
EHD*
3/4
23
3/4
23
1
30
1
31
Table 41
* EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.
Nominal Iron
Internal Diameter
Pipe inches
inches
5/8
0.527
3/4
0.652
Table 42
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.
Greentherm
Length of Black iron Pipe (Schedule 40 Metallic Pipe), Feet
10
20
291
200
608
418
1150
787
Length of Corrugated Stainless Steel Tubing (CSST), Feet
10
20
30
254
183
151
303
216
177
521
365
297
605
425
344
10
188
329
30
40
50
160
137
122
336
287
255
632
541
480
40
50
60
131
118
107
153
137
126
256
227
207
297
265
241
Length of Semirigid (soft) Copper ACR Tubing, Feet
20
30
129
104
226
182
Installation instructions | 31
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
6 720 805 440 (2014/11)
100
94
197
372
100
85
98
159
186
50
79
138

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