Alpine Installation, Operating, and Service Instructions

70
103448-10- 6/18
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 115 6 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 115 1 985 873 791 728 677 635 600
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