Buderus Logano plus GB312 Applications Manual page 28

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Fit and seal the gas isolating valve supplied
to the boiler's gas connection.
• The gas pipes must be fastened outside the boiler and
supported per code and standard plumbing practice.
Observe the local regulations or else the requirements the
National Fuel Gas Code, ANSI Z 223.1 or CAN/CSA
B149.1 in Canada, when connecting the gas supply.
Where required by local regulations, the installation must
comply with the American Code for Controls and Safety
Devices for Automatically Fired Boilers (ASME CSD-1).
Accessories to comply with ASME CSD-1 are available.
1
2
3
Fig. 20 Gas valve pipe connection
1 Gas supply
2 Manual shut-off valve (supplied)
3 Sediment trap
4 Gas connection with isolating valve
Technical specifi cations are subject to change without prior notice
4
7 747 010 720-22.1RS
Gas pipe delivery rate in cubic feet of
Length
gas per hour
of pipe
in feet 1" 1¼"
10 520 1060
20 350 730
30 285 590
40 245 500
50 215 440
75 175 360
100 160 305
150 120 250
Tab. 14 Gas pipe delivery rate
1) Maximum gas pipe delivery rate in cu ft/hr based on a gas spe-
cific gravity of 0.60 and a gas pressure of 0.5 psi or less and a
pressure drop equivalent to a water column of 0.3 inches.
Iron pipe Equivalent lengths for pipe fittings
nominal
diameter (in
inches)
90°
elbow
Equivalent lengths in feet
1 3
1¼ 4
1½ 5
2 7
2½ 8
Tab. 15 Equivalent lengths for pipe fittings
Disconnect the boiler and its gas isolating valve from the
gas supply pipe system if that system is subjected to
pressure tests in which the testing pressure exceeds ½
psi.
If the gas supply piping system is subjected to pressure
tests in which the testing pressure is ½ psi or less, it is
suffi cient to isolate the boiler from the gas supply piping
system by closing the relevant isolating valve.
• Test the boiler and gas supply connections for leaks
before commissioning.
Use only sealant that is resistant to corrosion by NG for
the pipe connections. The sealant must be applied sparingly
to the external thread of the pipe connections.
Logano plus GB312 applications manual | 04.2008
GB312 Applications Manual
1)
1½" 2" 2½"
1600 3050 4800
1100 2100 3300
890 1650 2700
760 1450 2300
670 1270 2000
545 1020 1650
480 870 1400
380 710 1130
in feet
Pipe fitting type
T-piece Shutoff Gas
valve cock
5 0.6 1.60
6 0.8 2.15
7 1.0 2.50
10 1.3 3.00
12 1.6 3.50