Crown Boiler PHNTM399, Инструкция по установке и эксплуатации

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47
VII. Gas Piping
WARNING
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.
A. Size gas piping. Design system to provide
adequate gas supply to boiler. Consider
these factors:
Inlet Pressure 13.8 in wc (3.4 kPa)or less; 0.3 in wc (0.07 kPa) 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 1/2 psi (3.4 kPa) or Less
Inlet Pressure 13.8 in wc (3.4 kPa) or less; 0.5 in wc (0.12 kPa) 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.
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.
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 16A (natural gas) or 16B (LP gas)
for maximum capacity of Schedule 40 pipe. Table
18 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 17A and gas with a specific
gravity of 1.5 can be sized from Table 17B, unless
authority having jurisdiction specifies a gravity
factor be applied. For other specific gravity, apply
gravity factor from Table 19. If exact specific
gravity is not shown choose next higher value.