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How to deal with Tianchen Bo Rui flowmeter failure, especially general technical maintenance personnel for some simple problems (smaller failures) I do not know where to start, how to rule out, which requires us to carefully analyze the problem, sum up experience, troubleshooting, In order to make the mass flowmeter better transported in actual production, we should also do a good job of instrument inspection and maintenance to ensure the measurement accuracy of the mass flowmeter.
We summarized and summarized the problems that occurred in the verification and use of mass flowmeters, and found that the failures could be quite large or small, but they could not be neglected. Otherwise, major measurement errors would occur. Now we have provided many troubleshooting analysis processes to everyone. for reference. The following will illustrate with specific examples:
Example 1: When a unit uses a Coriolis mass flow meter as a quantitative control meter at an external oil depot, it suddenly appears to be missing in the process of starting a car tanker. However, the verification result of the flow meter is qualified. After careful analysis on the site, it was found that the rapid closing of the solenoid valve located downstream of the flowmeter caused a strong fluid hydraulic impact, which had a great impact on the sensor's operation. If the flowmeter and the solenoid valve were replaced (ie, the solenoid valve was on the front, After the flowmeter is on,) the effect of the closing of the solenoid valve on the flowmeter is cut off, so that the working condition of the flowmeter returns to normal.
Example 2: A Coriolis force mass flow meter at an oil production plant often has a phenomenon of imaginary measurement during use. That is, if there is no flow in the pipeline, the cumulative number of flow meters will change. After careful inspection on the site, it was found that the mounting and support at both ends of the sensor did not meet the requirements. First, the two ends of the support were not equally spaced, and the other was that the bottom of the support was suspended from the ground and there was no firm connection. After taking measures to ensure that the installation of the two ends of the sensor meets the requirements, the measurement of the flowmeter returns to normal.
Example 3: A factory adopts Coriolis force mass flow meter to measure liquefied petroleum gas, its normal density is between (0152~0156)g/cm3, but during the measurement process, the density often shows that the value is lower than 015g/cm3. At this point, even if there is no fluid passing through the pipe, the flow meter may have positive and negative virtual flow, and the accumulated value may increase or decrease. The main reason for this phenomenon is that the flow meter is under pressure and the liquefied gas is liquefied. The gas-liquid ratio of the medium exceeds the specified range, which is not suitable for the normal use of the flowmeter. There are two ways to solve the problem. One is to increase the pressure of the process pipeline and the pressure of the flowmeter to avoid the vaporization of the process medium. The second is to use a small flow, low density cutting function, that is, to make the flowmeter below the specified flow rate. No recording, or the use of Coriolis mass flow meters, has the ability to select and meter based on the density range of the measured medium, so that the meter is not metered when the media density is below a certain range.
Example 4: During the operation of a Coriolis force mass flow meter in a certain factory, the deviation between its measurement value and the tank inspection scale is large. After inspection, it was found that the sensor was installed too close to the pump room. When the two pumps were working at the same time, the vibration was too great and affected the stable operation of the sensor. When the sensor was moved away from the vibration source, the situation returned to normal.
Example 5: A Coriolis force mass flow meter measures the product oil at a certain factory. When the flow rate rises above 20t/h, the flowmeter shows a density value of (1~3)g/cm3 and displays “DensOvering†and “Sensorerrorâ€. "Fault indication, everything will return to normal once the flow drops. After careful inspection on the spot, it is believed that the installation of the sensor and the field application environment are not a problem. After disassembling the flow meter, the sensor “Y†type flow distributor was found to have entered two pebbles at the entrance of the flow distributor during the pre-validation cleaning process. After taking it out, the flowmeter is qualified and the field is in good use.
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