Gas Supply Piping - RBI SPECTRUM Series Installation & Operation Manual

GAS SUPPLY PIPING

WARNING: 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!
The Spectrum boiler/water heaters come 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 the nearest RBI
representative to resolve the problem.
NOTE: A minimum gas supply pressure of 5 in,
127 mm W.C. natural or 12 in, 305 mm W.C. propane
and maximum gas supply pressure of 14 in,
356 mm W.C. natual or propane, must be available
at the safety shutoff valve inlet with the unit(s)
operating.
Table 10 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 ttings. Table 10
should be used in conjunction with Table 11 to ensure
that the gas supply piping has the capacity to meet the
demand.
Table 10 - Gas Pipe Capacity
Maximum pipe capacity in ft
at a pressure of 0.5 psig or less and a 0.3" W.C. pressure drop.
Nominal
10 20 30
Iron Pipe
Size, (in)
Maximum gas volume of pipe, (ft
3/4"
278 190 152
1" 520 350 285
1 1/4"
1050 730 590
1 1/2"
1600 1100 890
2" 3050 2100 1650
2 1/2"
4800 3300 2700
3" 8500 5900 4700
4" 17,500 12,000 9700
Note: Multiply the gas volume by 0.62 for propane fl ow capacity in ft
Multiply the propane fl ow capacity by 2500 Btu/ft
capacity for a given pipe size and length.
SPECTRUM INSTALLATION AND OPERATING INSTRUCTIONS
3 /hr based on 0.60 specifi c gravity gas
Pipe length in feet
40 50 60 80 100
3
/hr)
130 115 105 90
245 215 195 170
500 440 400 350
760 670 610 530
1450 1270 1150 990
2300 2000 1850 1600 1400
4100 3600 3250 2800 2500
8300 7400 6800 5800 5100
3 /hr.
3 to determine the propane Btu/hr
Table 11 - Equivalent Pipe Length
Iron Pipe
Size, (in)
Notes: 1. For fl ow through branch.
Figure 10 depicts the proper way to connect the
boiler/water heater to the gas supply piping. The 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
bottom 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.
Figure 10 - Gas Supply Piping
150
79 64
CAUTION: Always use a wrench on the gas valve
150 120
body when making gas connections to it. Never
305 250
over-tighten the piping entering the gas valve body
460 380
or gas valve failure may result!
870 710
1130
2000
4100
Type of pipe fi tting
Nominal
90°
Elbow Tee 1
Equivalent of pipe length (ft)
1" 2.6 5.2
1 1/4" 3.5 6.9
1 1/2" 4.0 8.0
2" 5.2 10.3
2 1/2" 6.2 12.3
3" 7.7 15.3
4" 7.7 15.3
2. For fl ow at full open.
Page 17
Gate Gas
Valve 2 Cock 2
0.6 1.5
0.8 1.9
0.9 2.3
1.2 3.0
1.4 3.7
1.8 4.5
1.8 4.5
RIOM-47