Gas Supply Piping - RBI DOMINATOR Series Installation And Operation Manual

Page 22

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 Dominator 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.
NOTE: A minimum gas supply pressure of 6 in,
152 mm W.C. natural or 11 in, 279 mm W.C. propane
and maximum 14 in, 356 mm W.C. natural or propane,
must be available at the safety shutoff valve inlet
with the unit(s) operating.
Table 9 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 9
should be used in conjunction with Table 10 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 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.
DOMINATOR INSTALLATION AND OPERATION INSTRUCTIONS
Table 9 - Gas Pipe Capacity
Maximum pipe capacity in ft 3
at a pressure of 0.5 psig or less and a 0.3" W.C. pressure drop.
Nominal
Iron Pipe
10 20 30
Size, (in)
Maximum gas volume of pipe, (ft
1ʺ 520 350 285
1
1 / ʺ 1050 730 590
4
1 1 /
ʺ 1600 1100 890
2
2ʺ 3050 2100 1650 1450 1270 1150 990
1
2 / ʺ 4800 3300 2700 2300 2000 1850 1600 1400 1130
2
3ʺ 8500 5900 4700 4100 3600 3250 2800 2500 2000
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
the propane Btu/hr capacity for a given pipe size and length.
Table 10 - Equivalent Pipe Length Chart
Nominal
Iron Pipe
90° Elbow
Size, (in)
Equivalent pipe length, (ft)
1ʺ
2.6
1
1 / ʺ 3.5
4
1 1 /
ʺ 4.0
2
2ʺ
5.2
1
2 / ʺ
6.2
2
3ʺ
7.7
Notes: 1. For fl ow through branch.
2. For fl ow at full open.
CAUTION: Always use a square jawed wrench on the
gas valve body when making gas connections to it.
Never over-tighten the piping entering the gas valve
body or gas valve failure may result!
Figure 16 - Gas Supply Piping
When applicable, provisions for vent, bleed and gas
relief lines must be made in accordance with the latest
revision of ANSI Z223.1/NFPA 54.
Safe lighting and other performance criteria were met
with the gas manifold and control assembly provided on
the boiler. All gas connections MUST be leak tested
before putting the boiler into operation.
/hr based on 0.60 specifi c gravity gas
Pipe length in feet
40 50 60 80 100
3
/hr)
245 215 195 170 150
500 440 400 350 305
760 670 610 530 460
870
3
to determine
Type of pipe fi tting
Tee 1 Gas Valve 2 Gas Cock
5.2 0.6
6.9 0.8
8.0 0.9
10.3 1.2
12.3 1.4
15.3 1.8
150
120
250
380
710
3 /hr.
2
1.5
1.9
2.3
3.0
3.7
4.5