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V cone flowmeters must be equipped with differential pressure transmitters for normal use
2012-4-5 10:41:55

是20世纪80年代开始研发的一种差压流量计,它的开发成功是差压式流量测量的质的飞跃。 V cone flowmeter is a kind of differential pressure flowmeter developed 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).

属高度、高稳定性的新型差压式流量仪表。 V cone flowmeter is a new type of differential pressure flow meter with high and high stability. Like other differential pressure instruments, the fluid flow rate is calculated based on the principle of flow continuity and Bernoulli's equation. We know that in the same closed pipe, when the pressure decreases, the speed will increase. When the medium approaches the cone, its pressure will be P +. When the medium passes through the throttle area of the cone, the velocity will increase and the pressure will decrease to P- As shown in Figure 1, both P + and P- are led to the differential pressure transmitter through the pressure taking port of the V-shaped cone flowmeter. When the flow rate changes, the differential pressure value will increase or decrease accordingly. In other words, for a stable fluid, the flow rate is proportional to the square root of the differential pressure. When the flow velocity is the same, the larger the cone throttle area, the larger the differential pressure value will be. 1. The first is non-standard installation: The non-standard installation of the V-cone flowmeter may be caused by the following reasons: insufficient straight pipe sections before and after the process pipeline, causing fluid instability and affecting measurement accuracy; there are problems with the installation direction, of course, this The problem will basically not occur unless it is caused by a mistake in the on-site installation; when measuring steam, the condensing device does not cool down completely and the installation height varies. 2. The second problem is the misoperation of the secondary instrument. When the V-cone flowmeter is used in the field, it must be equipped with a differential pressure transmitter to be used normally. Therefore, the performance and installation of the differential pressure transmitter directly affect V. The overall accuracy of the 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. The final impulse tube is blocked or leaked: When measuring viscous and crystalline media, 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, resulting in 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 to plug the loopholes.


在测量流量时为什么会遇到很多问题,我们通过现场故障分析,不难看出,实际上问题并不一定出在V 锥流量计质量上,而是出在人为因素上,中鼎现和各位同仁一起剖析解答。 Why does V-cone flowmeter encounter many problems when measuring flow? It is not difficult to see through field failure analysis that the problem is not necessarily due to the quality of V-cone flowmeter, but it is due to human factors. Zhongding Analyze the answers with colleagues. Here are three points of explanation: 1. The installation is irregular. The irregular installation of the V-cone flowmeter may be caused by the following reasons: insufficient straight pipe sections before and after the process pipeline, causing fluid instability and affecting measurement accuracy; installation direction There is a problem, of course, this problem will not happen unless it is caused by a mistake in the field installation; when measuring the steam, the condensing device does not cool down completely and the installation height varies 2. The second is the misoperation of the secondary meter When the V-cone flowmeter is used in the field, it 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. 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.The pressure guiding tube is blocked or leaked at the end, and when measuring viscous and crystalline medium, the pressure guiding tube and the shut-off valve are often blocked due to heat tracing and other reasons, so that the differential pressure 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.
When a problem occurs, we must carefully analyze and draw the correct conclusion of the failure, so that the problem can be dealt with quickly and accurately at the first time without causing loss to production.