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Installation
3.4 Differential pressure lines
Î Install the differential pressure lines
(pipes with 12 mm outside diameter) as
shown in Fig. 2.
Î Observe the proper sequence.
Î Use appropriate screw fittings to ensure
that the lines do not leak.
Î Install line sections, which would usually
run horizontally, with a constant down-
ward slope of at least 1:20, starting the
slope either at the orifice plate or at the
point where venting is possible.
Î Do not use a smaller bending radius
than 50 mm.
Î Thoroughly flush the differential pressure
lines before connecting them to the de-
vice.
3.5 Orifice flange (orifice plate
assembly)
Î The direction of flow must correspond to
the arrow on the orifice plate.
Î Unobstructed pipe sections are required
upstream and downstream of the orifice
plate assembly. For the orifice tubes de-
livered by SAMSON, these section are
ensured by the weld-on calibration
pipes. For orifice flanges, the unobstruct-
ed pipe section upstream of the orifice
plate is specified in the order confirma-
tion.
Î Make sure the orifice plate assembly as
well as the gaskets are properly aligned
with the pipeline.
14
Î Do not install any control valves that con-
stantly change the operating state of the
process medium (e.g. manually operated
control valves or temperature regulators)
upstream of the orifice plate assembly.
The operating state must match the condi-
tions calculated during sizing as closely as
possible. It is, however, favorable to install
equipment that keep the operating state con-
stant (e.g. pressure regulators) upstream of
the assembly.
EB 9520 EN
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