EB 2512 EN
31
Assembly
5.4 Additional fittings
Î
Refer to Fig. 8
5.4.1 Strainer
A strainer (2) installed upstream in the flow
pipe holds back any dirt or other foreign
particles carried along by the medium. For
example, the SAMSON Type 2 NI Strainer is
suitable (
u
The following points must be observed
during installation of the strainer:
−
Install the strainer upstream of the regu-
lator.
−
Do not use the strainer to permanently
filter the process medium.
−
Select a strainer (mesh size) suitable for
the process medium.
−
Allow sufficient space to remove the filter.
−
Observe the flow direction.
−
In horizontal pipelines, the filter element
faces downward.
−
Install strainers in vertical pipelines with
the medium flowing upward with the
drain plug facing upward.
Check the strainer at regular intervals and
clean it, if necessary.
Note
5.4.2 Bypass and shut-off
valves
−
Install a hand-operated shut-off valve (1
and 6) both upstream of the strainer and
downstream of the regulator to be able
to shut down the plant for cleaning and
maintenance and when the plant is not
used for longer periods of time.
−
The bypass ensures that the plant does
not need to be shut down for service and
repair work on the regulator.
5.4.3 Insulation
To insulate cold systems, we recommend first
filling the plant and carefully rinsing it. The
regulator must not yet be insulated at this
stage.
1. Start up the plant and adjust the set
point.
2. Shut down the plant again and let it heat
up until the condensation water has
dried off.
3. Insulate the regulator and pipes convey-
ing the process medium using insulation
material with a water vapor barrier. If a
control line is to be routed through the
insulation, special care must be taken
with the sealing since slight changes in
shape may occur. The insulation thick-
ness depends on the medium tempera-
ture and the ambient conditions. 50 mm
is a typical thickness.
