Installation requirements for nitrogen flow meters

If the diameter of the flow meter is DN20 while the diameters of the inlet and outlet pipes are DN25, it may result in an improper installation of the flow meter. Under normal circumstances, the diameter of the flow meter should match the inner diameter of the connecting pipe to ensure smooth flow of the fluid and accurate measurement of flow rate. The installation requirements for nitrogen flow meters generally include the following points: 1. The diameter of the flow meter should match the inner diameter of the pipeline to ensure a tight fit with no leaks. 2. Sufficient straight pipe sections must be provided upstream and downstream of the flow meter; typically, the upstream section should be 10 to 15 times the diameter of the flow meter, while the downstream section should be 5 times that diameter, in order to eliminate the impact of uneven flow velocity distribution on measurement accuracy. 3. Valves, elbows, tees, or other pipe fittings should be avoided being installed close to the flow meter, in order to prevent uneven distribution of fluid flow velocity. 4. The flow meter should be installed in a location that facilitates maintenance and reading. 5. Ensure that the flow meter is installed in a location that meets the manufacturer’s temperature and pressure requirements. The specific installation process must be carried out in accordance with the model of the flow meter and the manufacturer’s instructions; it is recommended to consult the manufacturer’s manual or guidelines to ensure that the installation is done according to the correct requirements. If in doubt, contacting a professional or the technical support provided by the manufacturer is the best option. .

The prerequisite is that the flow must be from bottom to top. It seems that a straight pipe section should be sufficient as well. The only problem is that I don’t understand: according to you, your flange should be DN20, so why was a 25mm pipe welded on?

For inlet and outlet pipes, use a reducer of 25×20; include straight pipe sections of 10D in front and 5D behind it

For flow meters with a large inlet and outlet diameter, it is possible to consider using a reduced-diameter version. In the case of electromagnetic flow meters, the length of the straight pipe section must also meet the installation requirements; the specifics depend on the type of flow meter being used

I still need to consult the manufacturer’s installation guidelines!

What size is your flange? DN25？ DN20？

The straight pipe sections before and after the flow meter are DN20 in size, while those outside are DN25 pipes

When a flow meter specifies a diameter of DN25, it refers to the size of the connection flange being DN25, not the diameter of the measurement tube. The straight sections before and after the flow meter are also determined based on the dimensions of the flanges at the pipe ends. For specific installation methods, please refer to the installation manual for that model