Gas Supply Piping - RBI 8800 series Installation And Operation Instructions Manual

SERIES 8800 & 8900 INSTALLATION AND OPERATING INSTRUCTIONS

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
s u p p l y. G a s s u p p l y p i p i n g m u s t b e i n
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 Series 8800 and 8900 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 presssure 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 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 fittings. Table 11
should be used in conjunction with Table 12 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. The manual shut-
off valve MUST be installed 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.
Maximum pipe capacity in ft /hr based on 0.60 specific gravity gas
3
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
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 flow capacity in ft
Multiply the propane flow capacity by 2500 Btu/ft3 to determine the propane Btu/hr
capacity for a given pipe size and length.
Pipe length in feet
40 50 60 80 100
/hr)
3
245 215 195 170 150
500 440 400 350 305
760 670 610 530 460
1450 1270 1150 990 870
2300 2000 1850 1600 1400
4100 3600 3250 2800 2500
8300 7400 6800 5800 5100
/hr.
3
Table 11 - Gas Pipe Capacity
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 12 - Equivalent Pipe Length Chart
Nominal
Iron Pipe
Size, (in)
1"
1 1/4"
1 1/2"
2"
2 1/2"
3"
4"
Notes: 1. For flow through branch.
2. For flow 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 14 - 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.
150
WARNING: Never use an open flame to test for
gas leaks. Always use an approved leak
120
detection method. Failure to comply with this
250
warning can cause extensive property damage,
380
severe personal injury or death!
710
1130
2000
4100
Type of pipe fitting
90° Gate Gas
Elbow Tee Valve Cock
1 2
Equivalent of pipe length (ft)
2.6 5.2 0.6 1.5
3.5 6.9 0.8 1.9
4.0 8.0 0.9 2.3
5.2 10.3 1.2 3.0
6.2 12.3 1.4 3.7
7.7 15.3 1.8 4.5
7.7 15.3 1.8 4.5
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