How to improve the orifice plate flowmeter measurement accuracy?

1. The design and installation of the metering device shall comply with the relevant standards. The fundamental reason for the influence on the measurement accuracy of the orifice meter is whether the geometry and flow dynamics of the metering device deviate from the design standards.

Therefore, in the course of use, the system must be regularly calibrated and maintained. Changes in operating parameters such as pressure, temperature, and flow during actual use should be corrected in time, and a full-compensation flow computer calculation scheme can be used. To reduce measurement errors and ensure metering accuracy.

2. Elimination of Pulsating Flow in the Air Flow The sudden change in the flow rate and pressure of the gas in the pipe causes a pulsating flow, which can cause fluctuations in the differential pressure, and the flow calculation formula of the throttling device is based on the steady flow of the orifice plate. When the measuring point has a pulsation phenomenon, the stability principle cannot be established, thereby affecting the measurement accuracy and generating measurement errors.

Therefore, in order to ensure the accuracy of natural gas measurement, pulsating flow must be suppressed. Common measures include:

a. Under the condition of satisfying the measurement capacity, a smaller measuring tube should be selected to improve the differential pressure and aperture ratio;

b. Use short pressure pipelines to reduce the resistance in the pipeline and make the lengths of the upstream and downstream pipelines equal, so as to reduce resonance and increase the amplitude of pressure ripple in the system;

c. Eliminating free liquid from the pipeline. The pulsation caused by the effusion in the pipeline can be handled by the automatic pigging system or by installing the dispenser at a low level. 3. Avoid man-made measurement errors, strengthen measurement management, improve the technical quality of operators, and actively introduce Absorbing advanced natural gas metering technology at home and abroad.