6
Installation
•
Check that the maximum inlet pressure is not
higher than the design pressure of the regulator.
•
Regulator should be lifted only with belts around
the body.
•
Arrange enough room for the serving of the
regulator.
Before installing the pressure regulator in the
piping, the following must be checked:
•
the upstream and downstream flanges must be
parallel so as to install the regulator without
undue stress.
•
the upstream piping must be cleaned from all
impurities (sand, welding slag, etc.)
•
the pressure regulator must not be visibly
damaged.
•
the inlet and outlet chambers of the pressure
regulator must be perfectly clean.
Make sure that the direction of gas flow corre-
sponds to the arrow on the pressure regulator
body.
When tightening the flange bolts, the following
maximum torque - applicable to Class 5.6 bolts -
should not be exceeded:
For ease of operation, we recommend performing
installation with the valve body in horizontal align-
ment, with actuator upwards.
Installation with actuator downwards or vertical in-
stallation are also possible.
Fig 3 gives a typical example of installation:
•
The downstream vent valve eases start-up and
changes in pressure setting
•
The creep relief valve - optional -limits pressure
surges (example: gas thermal expansion in case
of downstream piping exposed to sun radiation
at zero flow).
Outlet buffer volume
In case of fast variations of gas demand (ON/OFF),
the response time of the regulator may cause
transient pressure surges or drops that may trig-
ger the overpressure or under-pressure protec-
tion devices. These pressure changes can be limit-
ed to acceptable values by providing for a enough
downstream piping volume.
Sensing line
The sensing line must be connected to a section
reasonably free from turbulences, preferably in a
straight section of the downstream piping as
shown in Fig 3. Outlet pipe dimensions shall be
such that the gas velocity at pressure sensing tap
does not exceed those given below:
•
Outlet pressure < 200 mbar
15 to 20 m/s
•
Outlet pressure > 200 mbar
20 to 40 m/s
M12
M14
M16
M20
35 Nm
55 Nm
85 Nm
170 Nm
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