Analysis of failures caused by improper installation of mass flow meters

Do you know what are the reasons for the failure of the mass flowmeter? In this article, the editor will give you an analysis of the specific reasons for the failure of the flowmeter due to non-standard installation during the installation of the mass flowmeter: 1. The phenomenon of mass flowmeter failure The benzene of a company is exported through the mass flowmeter tube to the factory, After it was put into use in October 2010, the receiver reported that the total amount of benzene shipped from the factory was small and the error in comparison with the company's payment tank was about 0.5%. 2. Analysis of the cause of the failure of the mass flowmeter The mass flowmeter of the model JK300 is used in the factory for benzene. Use ProLink software to check and zero the flowmeter. The static zero point (Zero) value for three consecutive times is between 0.52 and 0.78μs, and the dynamic zero point (LiveZero) value changes between -0.45 and 0.2t/h, indicating that the zero point Not normal, the sensor is under stress. During the stoppage of delivery, it was found that the temperature and density curves of the mass flowmeter were abnormal, and there was gasification of benzene in the flowmeter. For this purpose, the flowmeter was inspected, and two problems were found: First, the mounting flange of the mass flowmeter was blocked by the heat tracing pipeline, and it was difficult to be parallel to the flange on the main line. After alignment, stress was generated after the bolts were tightened; The second is that the high-temperature steam tracing pipeline is close to the flowmeter sensor, which causes the temperature of the medium in the sensor to rise, resulting in gasification. 3. Solution to mass flowmeter failure By improving the heat tracing pipeline of the flowmeter, ensure that the flange surface of the mass flowmeter is parallel and centered to eliminate stress. The mass flowmeter is insulated with thermal insulation cotton, and then the overall heat preservation of the outside of the heat tracing pipeline eliminates the problem that the temperature of the medium that is directly attached to the surface of the mass flowmeter cannot be controlled. or gasification. Add the temperature upper and lower limit alarm points of the mass flow meter in the DCS, adjust the amount of heat tracing steam according to the temperature display value, and control according to the upper limit temperature not higher than 40 °C. After reinstalling and zeroing the flowmeter, the Zero value recovered to 0.03μs, and the LiveZero value was less than 0.1t/h and was stable, indicating that the stress of the sensor had been eliminated. By taking the above measures, the comparison error between the company and the receiver for three consecutive batches is less than 0.15%, which meets the requirement that the allowable error is less than 0.30%. The above 3 points are aimed at all kinds of faults that will occur in the process of non-standard installation and can be solved on the spot. I hope the above content can help you! Of course, no matter which flowmeter is used or installed, some situations will occur. I hope we can solve all problems calmly. And more about flow meters

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