Gas Piping - Burnham ALPINE Installation, Operation And Service Instructions

Vii. gas Piping
WaRning
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.
WaRning
Size corrugated stainless steel tubing (CSST)
to ensure proper capacity and minimize flow
restrictions.
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. Actual point of delivery pressure may be less;
contact gas supplier for additional information.
Minimum gas valve inlet pressure is stamped on
the rating label located in the boiler's vestibule
compartment.
Table 1a: Maximum Capacity of Schedule 0 Black Pipe in CFH* (natural gas) For gas Pressures
of 0.5 psig or Less
Nominal Pipe Inside
Diameter, In.
Size, In.
½
0.622
¾ 0.824
1 1.049
1¼ 1.380
1½
1.610
2 2.067
2½
2.469
3 3.068
Nominal Pipe Inside
Diameter, In.
Size, In.
½
0.622
¾ 0.824
1 1.049
1¼ 1.380
1½
1.610
2 2.067
2½
2.469
3 3.068
* 1 CFH of Natural Gas is approximately equal to 1 MBH; contact your gas supplier for the actual heating
value of your gas.
50
inlet Pressure 0.5 PSi or less; 0. inch W.C. Pressure Drop
10 20 30
131 90 72
273 188 151
514 353 284
1056 726 583
1582 1087 873
3046 2094 1681
4856 3337 2680
8584 5900 4738
inlet Pressure 0.5 PSi or less; 0.5 inch W.C. Pressure Drop
10 20 30
172 118 95
360 247 199
678 466 374
1392 957 768
2085 1433 1151
4016 2760 2217
6401 4400 3533
11316 7778 6246
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 14A (natural gas) or 14B (LP gas) for
maximum capacity of Schedule 40 pipe. Table 15
lists equivalent pipe length for standard fittings.
4. Specific gravity of gas. Gas piping systems for gas
with a specific gravity of 0.60 or less can be sized
directly from Tables 14A or 14B, unless authority
having jurisdiction specifies a gravity factor be
applied. For specific gravity greater than 0.60,
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, NFPA54/ANSI
Z223.1, or size system using standard engineering
methods acceptable to authority having jurisdiction.
B.
Connect boiler gas valve to gas supply system.
Length of Pipe, Ft.
40 50 60
62 55 50
129 114 104
243 215 195
499 442 400
747 662 600
1439 1275 1156
2294 2033 1842
4055 3594 3256
Length of Pipe, Ft.
40 50 60
81 72 65
170 151 137
320 284 257
657 583 528
985 873 791
1897 1681 1523
3024 2680 2428
5345 4738 4293
70 80 90
46 42 40
95 89 83
179 167 157
368 343 322
552 514 482
1063 989 928
1695 1576 1479
2996 2787 2615
70 80 90
60 56 52
126 117 110
237 220 207
486 452 424
728 677 635
1402 1304 1223
2234 2078 1950
3949 3674 3447
100
38
79
148
304
455
877
1397
2470
100
50
104
195
400
600
1156
1842
3256