Mass flow meter verification work

The cleaning of the mass flowmeter is due to the complex composition of the crude oil medium on site. After a period of operation, the mass flowmeter will cause scaling on the wall of the measuring tube, which will directly affect the accuracy of mass flow and density measurement, and thus affect The results of the calibration mass flowmeter. Therefore, we clean the mass flowmeters submitted for inspection first, and then formally verify them. The verification environment of the mass flowmeter Since the mass flowmeter measures the mass flow by the force generated by the vibration, it has strict requirements on the installation and verification environment. In the process of verifying the mass flowmeter, we maintain its separate verification and do not verify it simultaneously with the positive displacement flowmeters on other pipelines to avoid resonance. The zero point drift phenomenon of the mass flowmeter will cause the zero point of the mass flowmeter to drift when the temperature, density, viscosity, etc. of the fluid change. Therefore, before the formal verification of the mass flowmeter, the zero point verification should be carried out. The specific method is: after the flowmeter is installed and on-line, let it run smoothly for 30 minutes, then close the downstream valve first, then close the upstream valve, and realize zero calibration through the zero calibration function. Since the debugging of the mass flowmeter cannot directly operate the meter head of the flowmeter, the HART protocol is generally used for external debugging. According to the flow calibration coefficient on the nameplate, the first five digits are the flow coefficient, which should be corrected according to the error. The processing of verification data Since we use the method of combining the volumetric tube and the density meter, it is necessary to ensure the accuracy of the signal transmission of the density meter and the correct application in the computer. In the verification program of our laboratory, the signal from the density meter is connected to the PLC technology module, and after computer configuration, it participates in the calculation. With the wide application of mass flowmeters in oil fields, there are higher requirements for the verification of crude oil medium of mass flowmeters. Through the analysis and summary of some precautions in the verification, we can better carry out quality control in the future. The verification work of the flowmeter, and ensure the accuracy and reliability of the measurement of the mass flowmeter in the oil field.

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