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Industry Information
Summarize the incorrect operation of the V-cone flowmeter
2012-3-17 8:20:33

技术特点 V cone flowmeter technical features

1. Low installation requirements: straight 0 ~ 3D straight pipe, rear 0 ~ 1D straight pipe section; 2. Wide range ratio: usually 10: 1, choosing the right parameter can achieve up to 50: 1; 3. Small pressure loss: The same β value, the pressure loss is 1/3 ~ 1/5 of the orifice plate; 4. Wear resistance: After the streamlined cone is throttled, a vacuum layer effect is generated on the surface of the cone, making the cone difficult to wear; 5. Not clogging Non-adhesion: The cone-shaped thorough purging design avoids the retention of residues, condensates or particles in the fluid; 6. Long-term stability is good: The β value can be unchanged for a long time and ensure accurate long-term measurement. 7. High accuracy: 0.5 grade; 8. Good repeatability: better than 0.1%; 9. Signal stability: "Signal fluctuation" is 1/10 of the orifice flowmeter; 10. Wide range of β value: The unique geometry of the V-cone flow sensor allows Extensive β value range 11, wide caliber range: DN25 ~ DN2000; 12, measurable high temperature and high pressure medium: working temperature up to 850 ℃, maximum pressure 40MPa; 13, measurable dirty medium (coke oven gas, blast furnace gas, raw materials Oil, residue oil, etc.); 14. Measurable gas-liquid two-phase media (moisture, condensate, etc.);


测量误差主要来源安装不规范,维护不及时或工艺系统工况参数变化引起的。 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.

1, followed by the misoperation of the secondary instrument

When the V-cone flowmeter is used in the field, 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.


2. The first is irregular installation

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 There are several main reasons for the irregular installation of V-cone flowmeters in the field: the lack of straight pipe sections before and after the process pipeline causes fluid instability and affects the measurement accuracy; there is a problem with the installation direction. Of course, this problem will basically not occur. Unless it is caused by an error in the field installation; when measuring steam, the condensing device does not cool down completely and the installation height varies


3, the final impulse tube is blocked or leaking

When measuring viscous and crystalline media, the pressure guiding tube and the shut-off valve are often blocked due to heat tracing and other reasons, which causes the differential pressure value input to the differential pressure transmitter to change, resulting in measurement errors. 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 economic loss on site.