Gas Supply Piping - RBI Futera XLF Series Manual

GAs sUppLy pipinG

Check the boiler/water heater rating plate
to make sure that the boiler/water heater is
for the type of gas that will be used. If it isn't, do not
connect the boiler/water heater to the gas supply. Gas
supply piping must be in accordance with the National
Fuel Code, ANSI Z223.1-latest revision or applicable
provisions of the local building codes. Canadian
installations must comply with CAN/CGA B149.1 or
B149.2 Installation Code. Failure to comply with this
warning can result in extensive property damage, severe
personal injury or death!
The Futera XLF comes from the factory ready to be piped to the gas
supply. If for any reason the boiler/water heater is not for the type
of gas available at the installation site, call your RBI representative to
resolve the problem.
With all units operating the gas supply pressure (natural
gas) at the safety shutoff valve inlet must be:
Minimum 3.5 inches, 88.9 mm, W.C.
Maximum 14 inches, 356 mm, W.C.
Tables 10 and 11 should be used to ensure that the gas supply piping
is sized properly. If more than one appliance is supplied by the same
supply pipe, the piping must be sized based on the maximum pos-
sible demand. Do not neglect the pressure drop due to pipe fittings.
Table 10 should be used in conjunction with Table 11 to ensure that
the gas supply piping has the capacity to meet the demand.
Figure 16 depicts the proper way to connect the boiler/ water heater
to the gas supply piping. The manual shut-off valve MUST be in-
stalled in the supply piping. It should be installed 5 ft, 1.5 m above
the floor where required by local codes. Provide a sediment trap at
the bottom of the vertical section of the gas supply pipe upstream of
the gas controls.
table 10 Gas pipe capacities (natural gas)
Maximum pipe capacity in ft
Pipe
10 20 30
size
2" 4,020 2,760 2,220
2½" 6,400 4,400 3,530
3" 11,300 7,780 6,250
4" 23,100 15,900 12,700 10,900
5" 41,800 28,700 23,000 19,700 17,500 15,800 14,600 13,600 12,700 12,000 10,600
6" 67,600 46,500 37,300 31,900 28,300 25,600 23,600 22,000 20,600 19,500 17,200 15,600 14,400 13,400 11,900
Note: For propane piping — Multiply the gas volume capacities above by 0.62 for propane flow capacities in ft
flow capacity by 2500 Btu/ft 3 to determine the propane Btu/hr capacity for a given pipe size and length.
22
Finned copper tube gas boilers & water heaters – Boiler manual
/hr, based on 0.60 specific gravity natural gas at a pressure of 0.5 psig or less and a 0.5" w.c. pressure drop,
3
for iron pipe with nominal size below, and for total equivalent length (in feet):
40 50 60
1,900 1,680 1,520 1,400
3,020 2,680 2,430 2,230
5,350 4,740 4,290 3,950
9,660 8,760 8,050
Figure 16
Gas Supply Piping
70 80 90 100
1,300 1,220 1,160
2,080 1,950 1,840
3,670 3,450 3,260
7,490 7,030 6,640
125 150 175 200
1,020 928 854 794
1,630 1,480 1,360 1,270
2,890 2,610 2,410 2,240
5,890 5,330 4,910 4,560
9,650 8,880 8,260
3 /hr. Multiply the propane
FTXLF-IOM-HN-1-110308 Copyright 2008 Mestek, Inc.
250
704
1,120
1,980
4,050
7,320