Installation problems and solutions of Coriolis mass flowmeters Weihai Kunke responded firstly

  I don't know what problems you have with the initial installation of the Coriolis mass flowmeter? Troubleshoot related problems and try to avoid secondary problems. So what solutions are there in terms of installation? Weihai Kunke is here to take the lead in solving the problem for everyone. Hope to be able to help you effectively.

  (1) The Coriolis mass flowmeter is detected by a fixed frequency of about 200Hz generated by the electromagnetic drive coil. If there is a strong electromagnetic field interference, frequency resonance will occur. Therefore, the Coriolis mass flowmeter should be kept away from electromagnetic sources such as transformers and frequency converters. 

  (2) The flange spacing of the pipeline should be consistent with the length of the Coriolis mass flowmeter sensor and aligned, and the firm bolts should be evenly applied. According to the principle of Newton's second law of motion, Coriolis force=mass×acceleration (F=ma), the axial and radial torsional stress generated by improper installation will change the vibration frequency and speed signal time difference, resulting in wrong measurement.

  A flowmeter was installed and installed with a Coriolis mass flowmeter 200 sensor with a flange spacing of 580mm. After 16 hours of commissioning and operation, the relative error of the total volume of the mixed liquid compared with the oil storage tank was 31%. The flowmeter is about 9 m3/h higher than the instantaneous flow rate of the mixed liquid, but the parameters such as water content, mixed liquid density and temperature are normal. A Coriolis mass flowmeter 200 sensor with the same type of flowmeter and a flange spacing of 593mm was exchanged here, and the construction unit was arranged to repair the pipeline flange on site. The sensor was calibrated and used normally. Then perhaps the sensor should be mounted without flange modification. After the zero-flow calibration has passed the oil-passing operation, the flow, temperature and density data are displayed normally. Therefore, it is determined that the reason for the total error of the flowmeter is that the construction personnel found that the pipeline gap was too large by 15mm and did not make up for the correction, and the stress exceeded the rated value due to forcibly shrinking and installing.

  After the replaced Coriolis mass flowmeter sensor recovers from stress for a certain period of time, it is sent for inspection and calibration to be qualified and reinstalled for use. The phenomenon of "hanging on the wall" of high-viscosity crude oil will lead to the change of the drive gain coefficient of the vibrating tube and the increase of the pressure loss. A reasonable flow rate range can ensure the accuracy of the Coriolis mass flowmeter, but it also produces a certain pressure loss. Therefore, when selecting a model, it is necessary to avoid large-diameter, low-flow, low-sensitivity, small-diameter, high-flow, and high-pressure losses. It is recommended to match the model according to the flow rate, accuracy and pressure loss curve provided by the supplier according to the site conditions.

  If there are installation problems under the correct installation method, you are welcome to call or consult online at any time. You can log in to the official website of Weihai Kunke Flow Meter for detailed inquiries. (www.kunkeandao.com/en ) Follow the editor and don't get lost. The content in the next issue will be more exciting. Come and speak freely with the editor.