3.2 Piping Precautions
■ Straight Pipe Length and Recommendations
For details on straight pipe lengths on the upstream and downstream of the vortex flowmeter, see Straight pipe
length and recommendations (1) to (3).
● Installation position
Design the piping so that the piping line is always filled with the fluid that flows through (constantly filled
condition).
If the flowmeter is in a constantly filled condition, measurement can be performed even when the pipe is
installed vertically or at inclined angle. However, it is recommended to avoid installing the instrument with
the transmitter positioned below the piping. When the fluid temperature is -40°C or less, do not install the
instrument with the transmitter positioned below the piping.
● Upstream conditions
Install the instrument in a section of straight pipe where the upstream side is sufficiently rectified.
● Adjacent pipes
Use the adjacent pipes which have a larger inner diameter than that of the vortex flowmeter.
Ensure that the piping and pipe of the vortex flowmeter are concentric.
Ensure that the gaskets of adjacent pipes do not protrude into the piping line.
● Straight pipe length
Check the conditions of the upstream and downstream piping, and provide the required straight pipe lengths.
If the conditions cannot be satisfied, the flow inside the piping line may be disturbed and this may cause
inaccurate readings. In this case, consider a flowmeter that does not require straight piping, such as a
Coriolis mass flowmeter.
<3. Installation>
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IM 01F07A01-01EN
Installation
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