KROHNE UFM 3030 Service EN - Manual (Page 10)

10 UFM 3030
Since gas will collect at the highest point of a pipe, installation of the flow meter at that location
should be avoided at all times. Also installation in a down going pipe should be avoided since a
completely filled pipe may not be guaranteed due to cascading affects. Additionally flow profile
distortion is possible.
Long horizontal pipes: install in slightly ascending
pipe section. If not possible, ensure adequate
velocity to prevent air, gas or vapour from
collecting in upper part of flow tube As a partially
filled meter will report higher than actual flow
rates, or not measure (as transducer pairs become
non-wetted).
Open feed or discharge: Install meter in a lowered
section of the pipe to ensure a full pipe condition
through the meter.
Down going pipeline over 5 m (16 ft) length: install
air vent
 downstream of the flow meter. To prevent
vacuum. While this will not harm the meter, it may
cause gases to come out of solution (cavitate) and
interfere with proper measurements.
Always install control valves downstream of flow
meter in order to avoid cavitation or distortion of
flow profile.
Never install flow meter on a pump suction side in
order to avoid cavitation or flashing in the flow
meter.
2.4 Pipe flanges
Refer to dimensional drawings for flange spacing
and in addition allow for thickness of gaskets.
Install flow meter in line with pipe axis. Pipe flange
faces must be parallel to each other, max.
Permissible deviation: Lmax - Lmin
≤
0.5 mm
(0.02").