3.2 Piping Precautions
■ Straight Pipe Length and Recommendations
For details on straight pipe lengths on the upstream and downstream of the vortex owmeter, see Straight pipe
length and recommendations (1) to (3).
● Installation position
Design the piping so that the piping line is always lled with the uid that ows through (constantly lled
condition).
If the owmeter is in a constantly lled 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 uid 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 suciently rectied.
● Adjacent pipes
Use the adjacent pipes which have a larger inner diameter than that of the vortex owmeter.
Ensure that the piping and pipe of the vortex owmeter 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 satised, the ow inside the piping line may be disturbed and this may cause
inaccurate readings. In this case, consider a owmeter that does not require straight piping, such as a
Coriolis mass owmeter.
<3. Installation>
11
IM 01F07A01-01EN
Installation
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