Thermal flow meter installation – insertion vs flanged

Flow

Is there any difference between insertion and flanged thermal meters, regarding the installation requirements?

Expert’s answer :Thermal flow meter installation – insertion vs flanged

The insertion version needs a correct insertion, flow direction, and other points. But installing the insertion version costs less than the flanged version, because you don’t need to cut the pipe to fit the flow meter in.

On the other hand, you can’t get the insertion meter into small pipes. For instance, the 65I from Endress+Hauser can fit in pipes from three to 60 inches, and the 65F can go in pipes from one to four inches.

Installation details

Flanged version

Courtesy of Endress+Hauser
  • This thermal meter typically goes in a vertical pipe with the product going up or down.
  • Head up or down will depend on the temperature of your process.
  • You can install it in an inclined pipe, but you have to follow the vendor’s instructions in the manual.
  • Reduction and expansion before the meter: inlet run = 15 times the diameter; outlet run = 2 times the diameter
  • 90-degree elbow or T-piece before the meter: inlet = 15; outlet = 2
  • two elbows before the meter: inlet = 20; outlet = 2
  • two elbows in three dimensions: inlet = 35; outlet = 2
  • Control valve before the meter: inlet = 50; outlet = 2

Insertion version

Courtesy of Sierra
  • Like the flanged version, this one will go in vertical pipes with product up or down, head up or down depending on temp, and inclined pipes need the manual
  • Reduction and expansion before the meter: inlet run = 20 times the diameter; outlet run = 5 times the diameter
  • 90-degree elbow or T-piece before the meter: inlet = 20; outlet = 5
  • two elbows before the meter: inlet = 25; outlet = 5
  • two elbows in three dimensions: inlet = 40; outlet = 5
  • Control valve before the meter: inlet = 50; outlet = 5

You need to check this info out with your vendor, because you can have slight differences in the recommendaations.

This video has more details on thermal flow meters:

 

Related tags: devices English Flow Installation Intermediate Measurements Q&A thermal flow meter
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