Gas Supply 8
13
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Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
8 Gas Supply
8.1 Gas Connections
Determine proper size gas pipe for the installation using
Table 3 and Table 4. Do not forget the pipe fitting losses
and observe proper size of the fittings.
A sediment trap must be installed at the inlet of the gas
supply piping to the boiler. When local codes require, a
manual shut-off valve must be installed outside the
boiler jacket. It is recommended that a manual shut-off
valve be installed on the main gas piping to the boiler.
The gas piping must be supported external to the boiler.
When installing the gas supply connection, it must
comply with local regulations or, if such regulations do
not exist, with the National Fuel Gas Code, ANSI Z
223.1. In Canada, the gas supply connection must
comply with local regulations or, if such regulations do
not exist, with CSA/CGA-B149 Installation Guidelines.
Table 3 Gas Pipe Capacity for different pipe sizes
1 Maximum pipe capacity in ft³/hr, based on a specific gravity of .60
and a gas supply pressure of .5 psi or less and a pressure drop of
.3 inches W.C.
Fig. 7 Gas supply piping: rear view
Item. 1: Gas supply piping
Item. 2: Manual shut off valve
Item. 3: Sediment trap
1
2
3
DANGER!
EXPLOSION DANGER !
The possibility for explosions exists due to
leaks in gas piping and connections.
z All gas connections must be tested for
leaks with a soap and water solution.
Length
of
pipe
(Feet)
Gas Volume Capacity
(ft3 / hr)
1
1/2“ 3/4“ 1“ 1 1/4“ 1 1/2“
10 132 278 520 1060 1600
20 92 190 350 730 1100
30 73 152 285 590 890
40 63 130 245 500 760
50 56 115 215 440 670
75 45 93 175 360 545
100 38 79 160 305 480
150 31 64 120 250 380
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