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Installation
Gas train
Description of gas train with VGD...
Description
Gas trains with a Siemens VGD double
valve are intended for the supply, main
shut-off, filtration, pressure regulation
and monitoring of the gas supply. They
can be used for all gases in the 1, 2, 3
gas families in accordance with DVGW
worksheet G 260/1 and/or EN 437. The
design complies with EN 676. All the
functional components have been
tested individually and awarded the CE
mark and number of the Notified Body.
The premounted gas valve train is
subjected to a leak test at the
manufacturer's works.
The rules of the DVGW, particularly the
DVGW-TRGI and TRF, must be taken
into consideration when the gas lines
are being installed and commissioned.
DIN 4756 and TRD 412 contain
stipulations concerning the construction,
design and technical safety principles of
oil firing in heating systems. DVGW work
sheets G 460 and G 461 apply to
systems with high operating pressures.
The gas lines must comply with the
stipulations of DVGW- TRGI for systems
with operating pressures of up to or
greater than 100 mbar.
Minimum scope of delivery for gas
trains in accordance with EN 676:
• 1 manual valve (optional)
• 1 Gas filter
• 1 Gas double valve
• 1 SKP15 actuator and 1 SKP25 or
1 SKP75 actuator
• 1 min. gas pressure switch
• 1 leakage monitoring unit or 1 gas
pressure switch for valve leak test
Options:
• Manual valve
• Test burner with pushbutton valve
• Pressure gauge with pushbutton valve
• Compensator
• Max. gas pressure switch
• Gas meter
• Pipe parts and connection parts
• Ignition gas device
• Installation supports
• High-pressure regulator with safety
shut-off valve (SSOV)
• Settling section with pulse lines for
high-pressure regulator
• Safety relief valve (SRV)
• Additional gas safety valve
16
Gas train with VGD
Technical data:
Types of gas:
Gas types of gas families 1, 2 and 3
according to DVGW Worksheet
G 260/1
Max. inlet pressure:
500 mbar
Elect. connection: AC 220-240 V,
50 Hz
Protection level: IP 54
Ambient temperature:
-10 °C to +60 °C
Media temperature:
-15 °C to +60 °C
(Liquid gas 0 °C to +60 °C)
Low- and high-pressure gas trains
If the outlet side of the regulator, or
individual fittings and devices
downstream of the gas pressure
regulator, have not been designed for
the maximum supply pressure that
occurs in the event of a fault, the gas
train must be equipped with a safety
shut-off valve (SSOV) and a safety relief
valve (SRV) in accordance with EN 676.
This equipment is generally required for
maximum supply pressures of >360
mbar and > 500 mbar respectively.
These are known as high-pressure gas
trains. If all gas train fittings and devices
have been designed/approved for the
maximum supply pressure that occurs in
the event of a fault, the gas train is
known as a low-pressure gas train. This
is the case, depending on component
selection, for maximum supply
pressures of 360 and 500 mbar.
Gas train selection
The gas train is defined on a system-
specific basis.
The following must be taken into
consideration:
• Burner output
• Furnace counterpressure
• Gas pressure loss in the burner head
• Gas pressure losses in the gas valves
The total drop in gas pressure must
always be lower than the available gas
flow pressure.
Subject to change without notice due
to ongoing technical developments.
03/2016 - Art. Nr. 4200 1044 8002A
Gas train installation
To fit the gas train supplied to the
burner, the screw connections and seals
provided for this must be used (supplied
with the product).
Please note: in order to prevent injury,
heavy gas train components should only
be fitted using suitable aids and lifting
equipment (crane, cable slings,
assembly supports). The max.
tightening torques must be observed
(see chapter on Installation/tightening
torques). The screw connections
tightened crosswise and evenly. The
screw connection must be checked to
ensure that it is leaktight. For further
information, please refer to the chapter
on commissioning the gas connection.
Mechanical support
During and after installation of the gas
train, mechanical support must be
provided using at least one telescopic
foot or a similar system (e.g. 1 on the
filter and 1 on the valve).
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