Gas Supply Piping - RBI Series 8800 Installation And Operation 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
supply. 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 Water Heaters
representative to resolve the problem.
Table 6 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 6
should be used in conjunction with Table 7 to ensure
that the gas supply piping has the capacity to meet the
demand.
Figure 7 depicts the proper way to connect the boiler/
water heater to the gas supply piping. Provide a
sediment trap at the bottom of the vertical section of the
gas supply pipe upstream of the gas controls.
Table 6 - Gas Pipe Capacity
Maximum pipe capacity in ft 3 /hr based on 0.60 specific gravity gas
at a pressure of 0.5 psig or less and a 0.3" WC pressure drop.
Nominal
Iron Pipe 10 20 30
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.
Table 7- Equivalent Pipe Length Chart
Type of pipe fitting
Nominal
90°
Iron Pipe
Elbow
Size, (in)
Equivalent of pipe length (ft)
1" 2.6
1 1/4" 3.5
1 1/2" 4.0
2" 5.2
2 1/2" 6.2
3" 7.7
4" 7.7
Notes: 1. For flow through branch.
2. for flow at full open.
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
1450 1270 1150 990 870
2300 2000 1850 1600 1400
4100 3600 3250 2800 2500
8300 7400 6800 5800 5100
3
/hr.
Gate Gas
Tee 1 Valve 2 Cock 3
5.2 0.6 1.5
6.9 0.8 1.9
8.0 0.9 2.3
10.3 1.2 3.0
12.3 1.4 3.7
15.3 1.8 4.5
15.3 1.8 4.5
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 7 - Gas Supply Piping
TO GAS SUPPLY
CAUTION: Always use a 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!
When applicable, provisions for vent, bleed and gas
relief lines must be made in accordance with the latest
revision of ANSI Z223.1.
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
150
before putting the boiler into operation.
120
WARNING: Never use an open flame to test for
250
380
gas leaks. Always use an approved leak
710
detection method. Failure to comply with this
1130
warning can cause extensive property damage,
2000
severe personal injury or death!
4100
Whenever the gas supply piping is pressure tested the
boiler/water heater gas controls must be protected.
If the test pressure is equal to, or less than 1/2 psig (3.5
kPa) isolate the boiler/water heater by closing it's manual
shut off valve, see Figure 16. If the test pressure is
greater than, or equal to 1/2 psig (3.5 kPa), disconnect
the boiler/water heater and its individual shut-off valve.
GROUND
JOINT
UNION
SEDIMENT TRAP & DRIP LEG
( TO EXTEND TO FLOOR )
Page 13
MANUAL
SHUTOFF
VALVE
TO GAS
CONTROL(S)