Abstract: how to improve the accuracy of orifice meter scale information produced by excellent flow meter
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Pipeline due to sudden changes in the velocity and pressure of the gas, cause the pulsating flow, it can lead to differential pressure fluctuation, and the flow of the throttle device calculation formula is based on LanKong board of steady flow, when the measurement point has pulsation phenomenon, stable principle can't.
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Pipeline due to sudden changes in the velocity and pressure of the gas, cause the pulsating flow, it can lead to differential pressure fluctuation, and the throttle device of flow calculation formula is based on LanKong board of steady flow, when the measurement point has pulsation phenomenon, stable principle cannot be established, which may effect the precision of measurement, the measurement error.
Pulse flow is equal to the total uncertainty according to GB/T2624 -
93 to calculate the uncertainty of measurement error and pulsating additional synthesis.
Type: ET -
Pulsating additional uncertainty, dimensionless;
When the axial speed, m/s;
Root mean square value component of speed, m/s.
Formula application conditions & le;
Therefore, in order to guarantee the natural gas measurement accuracy, must restrain pulsating flow.
Commonly used measures are: (
Under the condition of satisfy the measurement ability, should choose inner diameter smaller measuring tube, improve the differential pressure and aperture ratio;
Using short pressure pipeline, reduce the resistance of the pipeline, and the upstream and downstream piping length equal, reduce system produce resonance and pressure pulsation amplitude increase;
To eliminate the free liquid from the pipeline, pipeline of effusion caused by pulse can adopt automatic pigging system liquid or lower installation points to deal with.
The design of the metering device installation should SY/T 6143 -
1996 because of the orifice flowmeter
measurement precision is the root cause of the throttle device geometry and flow dynamic is deviating from the design standards.
Therefore in the process of use must be made in regular check and maintenance work of the system, the actual use of the change of condition parameters such as pressure, temperature, flow rate, should be timely correction.
Can use full compensation of flow computer integrating scheme, in order to reduce the measurement error and ensure the measuring accuracy.
Avoid artificial measurement error to strengthen management, improve the quality of operation personnel technology.
Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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