SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
20
Stage 3 – Gas Supply Connection
CAUTION
: Gas piping installation MUST comply with all local codes and regulations, and
current ANSI Z223.1, ‘’National Fuel Gas Code’’ or CAN/CSA-B149.
Gas pressure to the humidifier MUST never exceed
26’’ w.c. (6kPa).
A manual shut off valve (not supplied) MUST be installed on the gas supply line to the
humidifier. Ensure adequate size for the gas supply line (see below table).
A
⅛’’ NPT plugged taping for test pressure gauge connection must be installed
immediately upstream of the gas supply line.
Pipes must be inspected for dirt and chips after threading and reaming the end of pipes.
Gas piping installation must be supported so that no strains are imposed on the Humidifier
or controls.
Two wrenches must be used when connecting piping to the humidifier.
Drip pocket must be provided at any low spot in the gas line.
Minimum gas pipe gradient must be
¼’’ (1.5mm) in 40’’ (1m) horizontal run.
Air purge must be done by disconnecting piping at the gas valve.
Air purge MUST NOT be done at the heat exchanger of the humidifier.
After installation, field piping and humidifier gas train must be checked for leaks.
Do not use soap solution or open flame on humidifier gas train. A gas leak detector must
be used.
All leaks MUST be sealed prior to commissioning the humidifier.
Gas Pipe
Diameter
Model
Gas
Connection size
SKG3-
110, 155, 180, 210,
265, 310, 350, 405
Ø
1’’ NPT (25mm)
Male
SKG3-
505, 560, 610,
710, 765, 810
Ø1-
1/2’’ NPT (40mm)
Male
Please refer to local codes and regulations regarding the type and volume of gas handled,
in order to obtain the pressure drop allowed in the gas line and to determine gas pipe
diameter.
When multiple SKG3 humidifier modules are installed, total capacity, gas flow and length
of main must be taken into account.
Gas supply connection -
Fig. 30
Gas Leak Test
Pressure testing of the gas supply piping must be performed by the gas installer
in accordance with local codes and regulations.
Test pressure must be relieved from the gas piping system prior to opening the
manual shut off valve of the humidifier.
For any test pressure over 50psig (350kPa), humidifier MUST be disconnected
(at the gas shut off valve).
Gas supply pressure at the inlet pressure tap, when all burners are running, must
be:
7’’ w.c. (1.75kPa) for Natural Gas.
14’’ w.c. (3.5 kPa) for Propane and Butane.
!
G
A
S
L
IN
E
Drip pocket
¼ turn gas
valve
Optional 1/8'
’ NPT
Plugged taping for
test pressure gauge
SKG3
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