Crude oil mass flowmeter scale accuracy in calibration cycle down the cause and the countermeasure

Abstract: the quality of crude oil flow meter scale accuracy in calibration cycle down the reasons and countermeasures of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 2015 - 10 - 12 11:36:26 click: 241 crude oil flow meter accuracy in calibration cycle down the cause and the countermeasure to pick to: the poor quality of some oil flow meter itself, can not meet the quality requirements of crude oil metering; Some crude oil flow into the factory, due to the site. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the quality of crude oil flow meter scale accuracy in calibration cycle down the reasons and countermeasures of the article details. 2015 - 10 - 12 11:36:26 click: 241 crude oil flow meter accuracy in calibration cycle down the cause and the countermeasure to pick to: the poor quality of some oil flow meter itself, can not meet the quality requirements of crude oil metering; Some crude oil flow into the factory, due to the site conditions do not have, without verification directly into the site installation and put into use; When unpacking the case no nameplate or some crude oil flowmeter nameplate in the process of transportation lost, some light electric pulse counter nameplate instead of crude oil flow meter nameplate, crude oil flow meter of pressure level and other technical parameters not clear; Some crude oil flow meter because installation technology can not meet the requirements, the oil flow meter installation location tilt, the phenomenon such as flange gasket into tube. Key words: one, crude oil flowmeter calibration cycle analysis of the causes of error 1. Quality of crude oil flow meter and the selection of lax ( 1) Quality some crude oil flow meter itself is poor quality, can't meet the quality requirements of crude oil metering; Some crude oil flow into the factory, due to the site conditions do not have, without verification directly into the site installation and put into use; When unpacking the case no nameplate or some crude oil flowmeter nameplate in the process of transportation lost, some light electric pulse counter nameplate instead of crude oil flow meter nameplate, crude oil flow meter of pressure level and other technical parameters not clear; Some crude oil flow meter because installation technology can not meet the requirements, the oil flow meter installation location tilt, the phenomenon such as flange gasket into tube. （ 2) Straight pipe installation quality of volumetric flowmeter have no requirements. Don't have enough length of straight pipe before and after some crude oil flow meter and flow meter of the import and export directly connected to the pipe bending; Some install the flow meter before the filter and venting device is removed after use, etc. （ 3) Reasonable selection of some crude oil flowmeter selection is not reasonable, main show is the calibre of the flowmeter do not tally with the pipe flow; Some do not conform to the flowmeter types, should choose the sand mold and choose the ordinary; Some pressure level does not conform to, directly affect the use effect of the crude oil flow meter. 2. The error due to volume tube ( 1) Used to test the volume of crude oil flow meter tube did not conduct regular verification or extended the verification period, volume tube failed to verification or lengthen verification cycle to cycle; The volume tube is not regular weekly inspection, standard of value. （ 2) For the change value of the volume pipe repair, without the national station check, but is directly put into use after self-inspection. On-site verification, not in strict accordance with the volume tube using manual operation volume tube, pipe size of the part of the pipeline, valve leakage, directly affect the crude oil volume tube flowmeter metering accuracy, has also led to the test result is not accurate. 3. The error due to verification method ( 1) Verification of crude oil flow time, not in strict accordance with the crude oil flowmeter calibration procedures, flow instability in the crude oil flow meter for verification. （ 2) Not working in the oil flow meter under the conditions of verification, especially in order to save time, often through oil flow meter of oil temperature and oil temperature of the volume pipe test did not reach a balance. （ 3) Calibration of pipeline, crude oil flow meter outlet valve leakage. （ 4) Not considered in the process of verification of crude oil flow meter reasonable curve in actual use. （ 5) A new operation of crude oil flow meter measuring chamber of the gas has not been ruled out for verification. （ 6) Volume tube standard period of gas clean has not been ruled out of calibration. 4. Crude oil is poor in the process of oilfield development of common oil has two kinds: one kind is measured after centralized treatment station treatment purification of oil; The other is a measurement from single well, pressurization point without centralized treatment station treatment with impurity and oil sand. Oily bad crude oil flowmeter metering accuracy have two situations: one is with solid impurities in the oil, such as sand, slag, wax, pipe inner surface exfoliation, etc; Second, the oil contained in the organic or inorganic paint, such as iron, easy to stick in the oil screen or flowmeter metering chamber. In both cases can lead to measurement is not allowed. 5. Human factors ( 1) Individual metrological verification personnel is not strong sense of responsibility, not in the crude oil flow meter in normal use according to the verification regulation under the condition of correct operation, field data gathering is not reliable, lead to inaccurate test results; Have no patience with individual metrological verification personnel verification, verification results although within the scope of the permit, but on the verge of a metering error limits, such as 0. Level 2 of the crude oil flow meter, the verification result error is & plusmn; 0. 19%, although not very bad, but if they do not adjust, after use in verification cycle may at any time difference.

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