In the field of gas measurement, especially in the natural gas industry, as a kind of high precision measurement instrument of gas flow, vortex precession flowmeter
is more and more widely used in natural gas measurement.
Precession vortex flowmeter in use process, to ensure the accuracy and reliable instrument measuring accuracy, need verification work on a regular basis according to the maintenance procedures.
It is two years commonly) a verification period
, it involves how to reasonably from the table body pressure hole take compensation calculation.
Measurement in the actual production process, due to the complexity of measuring gas composition, will be mixed some impurities (
Such as oil, sand, etc. )
, these impurities can cause meter hole blockage and corrosion.
To apply pressure in the process of the verification work, therefore, some commissioner directly from the pipeline pressure hole take or not take pressure, doing that it will eventually lead to what the results?
We have to analyze.
Vortex precession flowmeter type cases, table body take pressure hole take way time verification flow meter has good linearity, verification flow in pipe take pressure hole take way timing meter linearity is poorer;
Flow under the condition of the same measure point, table body take pressure hole take pressure calibration method of meter error is small, pipe take pressure hole take pressure test error of the flowmeter;
The error due to pressure from two ways that increases with the increase of flow rate, the flow rate of 2900 m3 / h when both differ nearly six.
The accuracy of 2%, far beyond the flowmeter.
So, in the process of vortex precession flowmeter calibration, should be avoided in meter table body take outside pressure hole take pressure test.
So we use of vortex precession flowmeter is put forward some requirements: 1.
Suggest precession vortex flow meter manufacturer under the premise of the flowmeter performance is not affected, appropriate to improve the structure of the flow meter, such as can improve the position of the hole, against debris jam.
Users in the use of the site can install in the vortex precession flowmeter front-end filtering device, must remove clutter filter.
Factory will take pressure hole precession vortex flowmeter external screw grease, at the same time will take the pressure inside the hole with rubber plug plug, prevent sundry jam and draw hole of rust.
Vortex precession flowmeter calibration process, if a great changing flow, the flow pressure change is not obvious, the invalid verification system should be set to take pressure alarm, to prompt verification personnel to take appropriate remedial measures.
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