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Industry Information
The main source of measurement error of V-cone flowmeter
2012-3-26 14:14:06


V is a differential pressure flow meter. Like other differential pressure flow meters, it is based on Bernoulli's law of the mutual conversion of energy in a closed pipe, that is, the square root of the flow velocity and differential pressure in the pipe under a stable flow field. Directly proportional. This measurement principle is widely used. 现场安装不规范主要可能有下面几个方面:工艺管道前后直管段不足,造成流体的不稳定,影响测量精度;检查V锥流量计正压引压管路的问题,要做到,引压管的畅通。 The irregular installation of V-cone flowmeters in the field may mainly have the following aspects: insufficient straight pipe sections before and after the process pipeline, causing instability of the fluid, affecting the measurement accuracy; checking the problems of the positive pressure impulse pipelines of the V-cone flowmeters, and , The impulse pipe is unobstructed. Check for leaks and plugs, because if such a problem occurs, the differential pressure transmitter is subjected to unidirectional pressure, which will cause the above-mentioned negative pressure phenomenon. When measuring steam, the condensing device will not cool down completely and the installation height will be unreasonable. The V-cone flowmeter must be equipped with a differential pressure transmitter for normal use. Therefore, the performance and installation of the differential pressure transmitter directly affect the overall accuracy of the V-cone flowmeter. Pay attention to the anti-corrosion of the differential pressure transmitter, and open the drain regularly. When measuring high-pressure or corrosive media, pressure leaks or joints often leak, causing pressure loss and differential pressure deviation. The solution is to conduct inspections on time and plug the loopholes.


The main sources of measurement errors of V-cone flowmeters are caused by improper installation, untimely maintenance, or changes in process system operating parameters. Today I will summarize the faulty operation of the V-cone flowmeter. 现场安装不规范主要可能有下面几个原因:工艺管道前后直管段不足,造成流体的不稳定,影响测量精度;安装方向有问题,当然了,这个问题基本是不会发生的,除非是现场安装的失误造成的;测量蒸汽的时候,冷凝装置降温不彻底,安装高度不等2,其次就是二次仪表的误操作问题、V锥流量计现场使用的时候,都要配备差压变送器才能正常使用,所以,差压变送器性能和安装的正确与否直接影响V锥流量计的整体精度。 1. The first is the irregular installation. The irregular installation of the V-cone flowmeter may be caused by the following reasons: insufficient straight sections in the front and rear of the process pipeline, causing instability of the fluid, affecting the measurement accuracy; there are problems with the installation direction, of course, this The problem basically will not happen unless it is caused by the error of the on-site installation; when measuring the steam, the cooling of the condensing device is not completely cooled and the installation height is different2, followed by the misoperation of the secondary meter and the V-cone flowmeter on-site use When it is used, a differential pressure transmitter must be equipped for normal use. Therefore, the performance and installation of the differential pressure transmitter directly affect the overall accuracy of the V-cone flowmeter. The V-cone flowmeter still has successful operation experience in measuring mixed fluids, but it is necessary to pay attention to the corrosion protection of the differential pressure transmitter and periodically open the drain valve. 3. When the impulse tube is blocked or leaked, and the viscous and crystalline medium is measured, the impulse tube and the shut-off valve are often blocked due to heat tracing and other reasons, so that the differential pressure value input to the differential pressure transmitter changes. Measurement error. Elimination methods are to conduct inspections on time, clean the sewage or clean with a hand pressure pump. When measuring high-pressure or corrosive media, pressure leaks or joints often leak, causing pressure loss and differential pressure deviation. The solution is to conduct inspections on time and plug the loopholes. Through the above description, our on-site maintenance technicians can easily find the fault of the V-cone flowmeter and reduce the on-site economic loss.
V-cone flowmeter , also known as; V-cone flowmeter; V-cone flowmeter; cone-type flowmeter; conical flowmeter; inner cone flowmeter; inner-cone flowmeter, integrated V-cone flowmeter V-cone flowmeter is a differential pressure flowmeter developed by our company in the 1980s. Its successful development is a qualitative leap in differential pressure flow measurement. It uses the throttling effect produced by the V-cone in the flow field to measure the flow rate by detecting the upstream and downstream pressure difference. Compared with ordinary throttling parts, it changes the throttling layout, from central hole throttling to annular throttling. Practice proves that compared with other flow meters, V-cone flowmeters have the advantages of high long-term accuracy, good stability, limited installation conditions, wear resistance, wide measurement range, small pressure loss, and suitable for dirty media. And the V-cone itself, as a rectifier of the flow field, has become an excellent new type of flowmeter with unique performance. The V-cone flowmeter, which is a combination of a V-cone sensor and a differential pressure transmitter, can accurately measure the flow of various media within a wide Reynolds number (8 × 103≤Re≤5 × 107).