Vortex flow meter
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What do 10D in front and 5D behind mean for a vortex flow meter?
Ensuring a straight pipe section mainly serves to stabilize the flow. \"Ten before and five after\" means that there should be a straight pipe section with a diameter ten times that of the gauge in front of it, and a straight pipe section with a diameter five times that of the gauge behind it.
D refers to the diameter; these are the straight pipe sections before and after that are required for installation. If the required straight pipe section is not achieved, it will cause interference signals in the instrument. It causes measurement errors.
D is the pipe diameter, indicating that the straight sections before and after it are 10 times and 5 times the diameter respectively
It refers to the requirements for the straight pipe sections in the pipelines upstream and downstream of the flow meter installation. D stands for diameter; generally, the nominal outer diameter is sufficient. For example, for a DN50 flow meter, the straight pipe section upstream should be at least 500 mm long, and that downstream should be at least 250 mm long. A straight pipe section means that there should be no changes in diameter, no bends, no control valves, and no inserted temperature sensors.
I’ve seen that some flowmeters have more stringent requirements; there are those that require 17D at the beginning and 5D at the end as well
The values denote the lengths of the straight sections before and after the device; 10D refers to 10 times the nominal diameter, while 5D refers to 5 times the nominal diameter. For vortex flowmeters, the lengths of the straight sections before and after must be greater than those specified in the installation manual – they cannot be shorter, as this will affect the accuracy
There are 10 dogs in front and 5 dogs behind. D meansDOG