YOKOGAWA VY Series - Piping Precautions and Recommendations

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 su󰀩ciently rectied.
● 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 satised, 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>
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IM 01F07A01-01EN
Installation
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