Gas Supply Piping - RBI 8900 Series Installation & Operation Manual

Page 20 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
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 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 8 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 8
should be used in conjunction with Table 9 to ensure
that the gas supply piping has the capacity to meet the
demand.
Figure 12 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.
Table 8 - 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
Iron Pipe
Size, (in)
1" 520 350
1 1/4"
1050 730
1 1/2" 1600 1100
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/ft3 to determine the propane Btu/hr
capacity for a given pipe size and length.
3 /hr based on 0.60 specifi c gravity gas
Pipe length in feet
30 40 50 60 80
Maximum gas volume of pipe, (ft 3 /hr)
285 245 215 195 170
590 500 440 400 350
890 760 670 610 530
1450 1270 1150 990
2300 2000 1850 1600
4100 3600 3250 2800
8300 7400 6800 5800
3 /hr.
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 9 - Equivalent Pipe Length Chart
Nominal
Iron Pipe
Size, (in)
1 1/4"
1 1/2"
2 1/2"
Notes: 1. For fl ow through branch.
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 12 - 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.
WARNING: Never use an open fl ame to test for
100 150
gas leaks. Always use an approved leak
detection method. Failure to comply with this
150 120
warning can cause extensive property damage,
250
305
severe personal injury or death!
460 380
710
870
1400 1130
2000
2500
5100 4100
Type of pipe fi tting
90° Gate
Elbow Tee 1 Valve
Equivalent of pipe length (ft)
1" 2.6 5.2 0.6
3.5 6.9 0.8
4.0 8.0 0.9
2" 5.2 10.3 1.2
6.2 12.3 1.4
3" 7.7 15.3 1.8
4" 7.7 15.3 1.8
2. For fl ow at full open.
Gas
2 Cock 2
1.5
1.9
2.3
3.0
3.7
4.5
4.5
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