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Finned copper tube gas boilers & water heaters – Boiler Manual
20
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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 .2 Installation Code. Failure
to comply with this warning can result in extensive
property damage, severe personal injury or death!
Th e Futera Fusion 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.
A minimum gas supply pressure of
2 in
,
51 mm
, WC
natural or propane and maximum
14 in
,
356 mm
WC natural or propane, must be available at the safety
shutoff valve inlet with the unit(s) operating, and not
to exceed a maximum of a (1.0 in WC) drop when
fi ring from minimum input to full load of the supply
line and all appliances running.
Table 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 possible
demand. Do not neglect the pressure drop due to pipe fi tt ings. 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 14 depicts the proper way to connect the boiler/water
heater to the gas supply piping. Th e manual shut-off valve MUST
be installed in the supply piping. It should be installed
5 ft
,
1.5 m
above the fl oor where required by local codes. Provide a sediment
trap at the bott om of the vertical section of the gas supply pipe
upstream of the gas controls.
A ground joint union should be installed between the boiler gas
controls and the supply piping. Each of these items are needed to
ensure long life and ease of servicing. Always use a pipe sealant
that is suitable for use with LP gas.
Table 11
Gas Pipe Capacity
Maximum pipe capacity in ft
3
/hr based on 0.60 specifi c gravity gas
at a pressure of 0.5 psig or less and a 0.3 in WC pressure drop.
Nominal
Iron Pipe
Size
Pipe length in feet
10
20
30
40
50
60
80
100
150
Maximum gas volume of pipe, (ft
3
/hr)
1"
520
350
285
245
215
195
170
150
120
1 1/4"
1050 730
590
500
440
400
350
305
250
1 1/2"
1600 1100 890
760
670
610
530
460
380
2"
3050 2100 1650 1270 1270 1150 990
870
710
Note: Multiply the gas volume by 0.62 for propane fl ow capacity in ft
3
/hr.
Multiply the propane fl ow capacity by 2500 Btu/ft
3
to determine
the propane Btu/hr capacity for a given pipe size and length.
Table 12
Equivalent Pipe Length Chart
Nominal
Iron Pipe
Size
Type of pipe fi tting
90° Elbow
Tee
1
Gate Valve
2
Gas Cock
2
Equivalent pipe length, (ft)
1"
2.6
5.2
0.6
1.5
1 1/4"
3.5
6.9
0.8
1.9
1 1/2"
4.0
8.0
0.9
2.3
2"
5.2
10.3
1.2
3.0
Notes:
1. For fl ow through branch.
2. For fl ow at full open.
Figure 14
Gas Supply Piping
