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This orifice flowmeter improves measurement accuracy that you don't know

2022-06-24 10:35:50

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  Regarding the orifice flowmeter, do you know how to accurately improve the measurement accuracy? The editor can promise that in this article, there must be secrets of orifice flowmeters that you do not know.

  Orifice flowmeter is used in flow measurement, control and regulation of various media in various industries; it has the characteristics of simple installation and convenient maintenance. The orifice flowmeter is a differential pressure generating device for measuring flow. It can measure the flow of various fluids in the pipeline with various differential pressure gauges or differential pressure transmitters. Orifice flowmeter throttling device includes annular chamber orifice, nozzle, etc.

  How Orifice Flow Meters Improve Measurement Accuracy:

  1. The design and installation of the metering device should meet the corresponding standards. The fundamental reason that affects the measurement accuracy of the orifice flowmeter is whether the geometry and flow dynamics of the throttling device deviate from the design standards. Therefore, the system must be regularly checked and maintained during use. Changes in operating parameters such as pressure, temperature, and flow rate in actual use should be corrected in time. The full-compensated flow computer calculation scheme can be used. , in order to reduce the measurement error and ensure the measurement accuracy.

  2. Eliminate the pulsating flow in the airflow. The pulsating flow is caused by the sudden change of the flow rate and pressure of the gas in the pipeline, which can cause fluctuations in the differential pressure. The flow calculation formula of the throttling device is based on the stable flow of the orifice plate. , When there is pulsation at the measurement point, the stability principle cannot be established, which affects the measurement accuracy and produces measurement errors. Therefore, in order to ensure the accuracy of natural gas measurement, the pulsating flow must be suppressed. The usual measures are:

  a. Under the condition that the measurement capacity is met, a measuring tube with a smaller inner diameter should be selected to improve the differential pressure and aperture ratio;

  b. Use short pressure-inducing pipelines to reduce the resistance parts in the pipelines, and make the upstream and downstream pipelines equal in length to reduce resonance in the system and increase in pressure pulsation amplitude;

  c. Eliminate free liquid from the pipeline, and the pulsation caused by the accumulation of liquid in the pipeline can be handled by an automatic pigging system or a liquid separator installed at a low position

  3. Avoid man-made measurement errors Strengthen measurement management, improve the technical quality of operators, and actively introduce absorbed natural gas measurement technology.

  Now, whether the above three points have been helpful to you, I hope you can try it according to the editor's arrangement, and maybe you will find some changes. If you have any doubts, please feel free to call and consult with the editor to understand For more flow meter knowledge, remember to pay attention to the editor, the next issue will be more exciting.

Author: Weihai Kunke Flow Instrument Co.,Ltd.
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