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Bosch C 950 Installation Manual page 30

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30 | Installation instructions
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 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 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 14" W.C. (0.5 psig or 25 mbar) or less and a pressure drop of 0.3"
W.C. (0.75mbar) based on 0.60 specific gravity gas).
Nominal Iron
Internal
Pipe Size,
Diameter
inches
inches
3/4
0.824
1
1.049
1 - 1/4
1.380
1 - 1/2
1.610
Table 37
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 Iron
Internal
Pipe Size,
Diameter
inches
inches
1/2
0.622
3/4
0.824
1
1.049
Table 38
Maximum pipe capacity in cubic feet of Natural Gas per hour for gas pressures of 14" W.C. (0.5 psig or 25 mbar) or less and a pressure drop of 0.5"
W.C. (1.25mbar) based on 0.60 specific gravity gas).
Tube
size,
inches
EHD*
10
1
30
1
31
1 - 1/4
37
1 - 1/4
38
Table 39
* EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.
6 720 805 440 (2014/11)
Length of Black Iron Pipe (Schedule 40 Metallic Pipe), Feet
10
20
30
273
188
151
514
353
284
1060
726
583
1580
1090
873
Length of Black Iron Pipe (Schedule 40 Metallic Pipe), Feet
10
20
30
454
312
250
949
652
524
1787
1228
986
Length of Corrugated Stainless Steel Tubing (CSST), Feet
20
30
330
231
188
383
269
218
639
456
374
746
526
442
40
50
60
129
114
104
243
215
195
499
442
400
747
662
600
Minimum Gas Pressure 8.0" WC (20 mbar)
40
50
60
214
190
172
448
397
360
844
748
678
40
50
60
162
144
131
188
168
153
325
292
267
386
347
318
70
80
90
95
89
83
179
167
157
368
343
322
552
514
482
70
80
90
158
147
138
331
308
289
624
580
544
70
80
90
121
113
107
141
132
125
248
232
219
295
277
262
100
79
148
304
455
100
131
273
514
100
101
118
208
249
Greentherm

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