Installation precautions for vortex flow meters

Today, I'd like to introduce some important considerations during the installation and use of vortex flow meters, which is a topic of great interest. The installation accuracy of a vortex flow meter directly affects the reliability of the measurement results and the lifespan of the equipment. Installation requires comprehensive consideration of multiple factors, including the straight pipe section, pipeline conditions, and the site environment.

First, there are the straight pipe section requirements. To ensure stable fluid flow, sufficiently long straight pipe sections must be maintained before and after the flow meter. Generally, the upstream straight pipe section should be no less than 15~20D (D is the pipe diameter), and the downstream straight pipe section should be no less than 5~10D. If there are flow obstructions such as elbows, reductions, or expansions upstream, the straight pipe section may need to be further lengthened. For example, if there are two 90° elbows at different planes upstream, a 40D straight pipe section may be required. Control valves or partially open valves should ideally be installed 5D downstream of the flow meter to avoid upstream flow interference.

Secondly, there are the pipeline conditions. The inner diameter of the pipe should match the inner diameter of the flow meter, with an allowable deviation range typically between 0.98DN and 1.05DN. Concentricity must be ensured during connection. The inner diameter of the sealing gasket used during installation must be slightly larger than the pipe's inner diameter (e.g., 1-2 mm larger). Gaskets must not protrude into the pipe's inner wall, as this will interfere with the fluid flow and cause measurement errors. Before formally installing the flow meter, the pipe must be purged or cleaned thoroughly to remove welding slag, mud, hemp fibers, and other debris to prevent damage to the sensor.

The installation direction must be consistent with the flow direction. The direction indicated by the arrow on the casing must be strictly followed to ensure alignment with the fluid flow direction within the pipe. For horizontal installation, ensure the measuring tube is always filled with liquid (to avoid air bubble interference); for vertical installation, the fluid flow direction should be from bottom to top. In addition, when measuring high-temperature media (such as steam), the amplifier (meter head) should be installed vertically downwards or heat insulation measures should be taken, but never completely cover the connecting rod with insulation material; when measuring gas containing a small amount of liquid, the instrument should be installed at a higher position on the pipeline; when measuring liquid containing a small amount of gas, it should be installed at a lower position on the pipeline.

These are some points to note during the installation process. We hope this information is helpful. If you have any further questions, please leave us a message.