The requirements and precautions of the precession vortex flow meter when measuring natural gas

2021-12-01
The requirements and precautions of the precession vortex flow meter when measuring natural gas
1. The requirements for the measured airflow conditions of the brigade vortex flow rate
1. The gas to be measured should be a single-phase, circular pipe flow that flows continuously through the pipeline.
2. Before the gas flows through the flow meter, its flow rate must be parallel to the axis of the pipeline, and there must be no vortex flow.
3. The air flow should be subsonic, non-pulsating, and its flow changes slowly with time.
2. Installation requirements for the precession vortex flow meter
The precession vortex flow meter does not have too many special requirements for the process installation and use environment, but any-like flow meter measuring instrument has such a commonality, that is, as far as possible to avoid vibration and high temperature environment with the flow state interference components ( Such as compressors, separators, pressure regulators
Valves, size heads, headers, elbows, etc.), keep the inner wall of the straight pipe section before and after the instrument smooth and straight, and ensure that the measured medium is a clean single-phase fluid.
3. Matters needing attention in the installation and use of the precession vortex flow meter
The precession and rotation flow meter has no mechanical moving parts, small size, corrosion resistance, stable performance, and can directly display the working pressure, temperature, flow of the medium and the gas flow in the standard state. The range is wide, and the error in the meter is small, etc. Advantages, now widely used in oil and gas
The well’s production plan and the natural gas sales plan.
To ensure the accuracy of the calculation in the precession vortex and reduce the calculation error, please pay attention to:
1. Reasonable selection: Do not make the actual minimum flow QVmin lower than the lower limit of the selected flow meter.
2. The installation is correct: there should be a straight pipe section with a length of at least 10D upstream of the flow meter. The inner wall of the straight pipe section should be smooth, and there should be no steps. The welding seam of the connecting flange should be smoothed, and the flange gasket should not protrude into the pipe. It is also impossible to install the flow meter in the reverse direction
NS. The test proves that all unreasonable installations will result in the low value of the flowmeter.
 

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