L
--
740
--
28
--
E
Fig. 6.8
6.3 Installation Location
Because air bubbles in the flow tube produce a loss of meter accuracy, avoid the following installation or
practice.
●
Locating the flowmeter at the highest point in the piping system.
●
In a vertical piping system, directly discharging the metered fluid from the piping system without the
provision of a valve or similar controlling device.
(While Type U meter is used in the installation examples below, the same applies to Types S and B.)
① Avoid installing on the suction side of a pump.
Isolate
sufficiently
from pump
vibration.
Pump
② If the flowmeter is to be installed at the highest point
of the process, make sure that gas is not retained in
the pipeline.
Installation of valves for gas venting is recommended.
③ To prevent cavitation, avoid installation at the outlet
which is open to the atmosphere.
In cases where such installation is unavoidable due
to limited space, install a valve on the outlet side.
⑤ Where hydrostatic head is used.
④ For vertical installation, avoid routing the outlet pipe
as shown in the diagram below.
In cases where such installation is unavoidable,
install a valve for gas venting.
Take precaution
against bubble
entrapment when
liquid level is low.
Do not allow air
bubbles.
Keep filled with liquid.
Pressure control, full-
liquid control valve
Orifice
Open !!
Gas vent valve
Gas vent valve
on
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