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VII. Gas Piping
A. Size gas piping
.
Design system to provide
adequate gas supply to boiler. Consider these
factors:
1. Allowable pressure drop from point of
delivery to boiler
.
Maximum allowable system
pressure is ½ psig (3.4 kPa). Actual point of
delivery pressure may be less; contact gas
supplier for additional information. Minimum
gas valve inlet pressure is printed on the
rating label located in the boiler’s vestibule
compartment.
Inlet Pressure 0.5 PSI or less; 0.3 Inch W.C. Pressure Drop
Nominal Pipe
Size, In.
Inside
Diameter, In.
Length of Pipe, Ft.
10
20
30
40
50
60
70
80
90
100
½
0.622
131
90
72
62
55
50
46
42
40
38
¾
0.824
273
188
151
129
114
104
95
89
83
79
1
1.049
514
353
284
243
215
195
179
167
157
148
1¼
1.380
1056
726
583
499
442
400
368
343
322
304
1½
1.610
1582
1087
873
747
662
600
552
514
482
455
2
2.067
3046
2094
1681
1439
1275
1156
1063
989
928
877
2½
2.469
4856
3337
2680
2294
2033
1842
1695
1576
1479
1397
3
3.068
8584
5900
4738
4055
3594
3256
2996
2787
2615
2470
Table 17A: Maximum Capacity of Schedule 40 Black Pipe in CFH* (Natural Gas) For Gas Pressures
of 0.5 psig or Less
Inlet Pressure 0.5 PSI or less; 0.5 Inch W.C. Pressure Drop
Nominal Pipe
Size, In.
Inside
Diameter, In.
Length of Pipe, Ft.
10
20
30
40
50
60
70
80
90
100
½
0.622
172
118
95
81
72
65
60
56
52
50
¾
0.824
360
247
199
170
151
137
126
117
110
104
1
1.049
678
466
374
320
284
257
237
220
207
195
1¼
1.380
1392
957
768
657
583
528
486
452
424
400
1½
1.610
2085
1433
1151
985
873
791
728
677
635
600
2
2.067
4016
2760
2217
1897
1681
1523
1402
1304
1223
1156
2½
2.469
6401
4400
3533
3024
2680
2428
2234
2078
1950
1842
3
3.068
11316
7778
6246
5345
4738
4293
3949
3674
3447
3256
* 1 CFH of Natural Gas is approximately equal to 1 MBH; contact your gas supplier for the actual heating value of your
gas.
2. Maximum gas demand
.
Refer to the boiler’s
input as printed on its rating label. Also
consider existing and expected future gas
utilization equipment (i.e. water heater, cooking
equipment).
3. Length of piping and number of fittings.
Refer to Tables 17A (natural gas) or 17B (LP
gas) for maximum capacity of Schedule 40
pipe. Table 14 lists equivalent pipe length for
standard fittings.
4. Specific gravity of gas.
Gas piping systems
for gas with a specific gravity of 0.60 can
be sized directly from Table 14 and gas with
a specific gravity of 1.5 can be sized from
Table 16B, unless authority having jurisdiction
specifies a gravity factor be applied. For other
specific gravity, apply gravity factor from
Table 16. If exact specific gravity is not shown
choose next higher value.
For materials or conditions other than those listed
above, refer to
National Fuel Gas Code,
ANSI
Z223.1/NFPA 54 or
Natural Gas and Propane
Installation Code,
CAN/CSA B149.1, or size
system using standard engineering methods
acceptable to authority having jurisdiction.
Explosion Hazard. Failure to
properly pipe gas supply to boiler may result in
improper operation and damage to the boiler
or structure. Always assure gas piping is
absolutely leak free and of the proper size and
type for the connected load.
An additional gas pressure regulator may be
needed. Consult gas supplier.
NOTICE
Size corrugated stainless steel
tubing (CSST) to ensure proper capacity and
minimize flow restrictions.
WARNING
Summary of Contents for Alpine ALP080B
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Page 77: ...103448 10 6 18 77 VIII Electrical continued Figure 27 Wiring Connection Diagram...
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