Reasons of the failure of precession vortex flowmeter
Author: PhilemonTime: 2020-10-14
Today, the flowmeter manufacturer Philemon Instrument mainly tells you about several major factors that affect the precession vortex flowmeter:
1. The meter installation does not meet the requirements, causing measurement errors
During the use of the precession vortex flowmeter, the key is to ensure the accuracy of the measurement. The installation quality is an important factor that affects the accuracy of the measurement and the reliability of the operation. In the actual installation process, on-site installers often have irregular installation behaviors, and this situation will lead to insufficient measurement accuracy. For example, at the installation site, there is a shrinkage phenomenon in the pipeline before and after the instrument, and the installation is too close. The distance will cause the measurement result to be too large, and the error between the measurement and the actual is very large. In addition, during the installation process, the professional quality of the installation personnel is low. In the actual installation process, the lack of quality control and detailed management of the entire installation process will also cause serious measurement deviations.
2. Instability of the measured gas volume causes measurement errors
The nature of the measuring medium of the precession vortex flowmeter is relatively special. If the measured gas volume is difficult to maintain stability during the actual measurement process, the accuracy of the measurement result will be affected. During the operation of the precessing vortex flowmeter, there is a large pressure loss. When a single well is metered, a certain amount of gas flow is generated. In this case, the gas volume of the gas source is relatively small. When the air pressure drops to a specific value, the swirling vortex flowmeter cannot accurately measure the air volume in time. In some special cases, the gas volume will show large or small changes over time, and this unstable trend makes the difficulty of measurement increase. When it is a pulsating fluid, it will appear random in the measurement process. The pulsating pressure will cause a certain impact on the flowmeter, which will result in insufficient measurement accuracy.
3. Instrument error caused by pipeline vibration
When the flow is very small, the measurement result of the precession vortex flowmeter is difficult to guarantee. In the actual measurement process, there are often vibrations in the process pipeline. Once the flow rate is small, the flowmeter is difficult to maintain the normal output state, and the measurement accuracy is greatly reduced. The common problem in the use of precessing vortex flowmeter is measurement error. This error is often caused by a variety of factors. Pipeline vibration is one of the key factors. When the pipeline is abnormal, the piezoelectric sensor can vibrate. Variations of various parameters caused by changes must be accompanied by signal output at this time, and it is difficult to guarantee the accuracy of measurement results.
4. Dirty measurement fluid media causes measurement errors
With the development of the measurement work of the precessing vortex flowmeter, a large amount of oil and other debris will inevitably be present in the flowmeter, and sometimes there will even be corrosion and damage. These conditions will cause acidification and pressure in the measurement process. The probability of cracking is further increased, causing the measured value to be far lower than the actual value. In the measurement work of the precession vortex flowmeter, the cleanliness of the medium must be ensured, otherwise, once there is saturated water vapor in the medium, when the temperature is too low, it will be accompanied by water condensation. During the metering process, if the metering separator has oil running from the gas path, a large amount of liquid will form in the pipeline; if there are impurities such as dirty oil and sand in the medium, vortex generators may occur during the metering process. The adhesion of surface impurities affects the accuracy of the measurement results.