Orifice plate flowmeter flare direction

Project Overview

The orientation of the bell mouth of the orifice flowmeter has an important impact on the accuracy of the flow measurement results. Generally speaking, there are two possible directions for the bell mouth of an orifice flowmeter: facing upstream and facing downstream.

Facing upstream

Advantages: When the bell mouth faces upstream, the resistance and measurement error when the pipeline fluid enters can be reduced, and the pipe diameter can be reduced. Eddy current disturbance at the entrance of the road. This installation method helps to obtain more accurate and reliable flow measurement results.

Installation suggestions: In actual installation, in order to ensure that the bell mouth faces upstream, the flow direction of the fluid should be found first, and then the orifice flowmeter should be installed with the fluid inlet end as upstream and the fluid outlet end as downstream.

Facing downstream

Problem: If the bell mouth faces downstream, the fluid at the bell mouth will increase rotation and shear, resulting in vortex generation and pressure The distribution is uneven, thus affecting the measurement results. In addition, this installation method may increase measurement errors and reduce the accuracy of the flow meter.

Note: Therefore, installation with the bell mouth facing downstream should be avoided as much as possible.

Comprehensive analysis

Standards and requirements: Although there are different opinions and installation requirements, based on most professional information and actual operating experience, the recommended bell mouth orientation Install upstream. This ensures accuracy and reliability of flow measurement.

Other factors: In addition to the orientation of the bell mouth, the installation of the orifice flowmeter also needs to consider many factors such as pipe diameter, length, elbows, etc. After installation is completed, a trial run and calibration should be carried out to check whether it meets the accuracy requirements of the flow meter.

Conclusion

In summary, the bell mouth of the orifice flowmeter should be installed facing upstream. This results in more accurate and reliable flow measurement results and reduces the impact of measurement errors and eddy current disturbances. In actual operation, installation and debugging should be carried out in strict accordance with relevant standards and requirements.