Level and Flow Measurement

+86 28 8701 3699

sales@vacorda.com

HOME> News

News
Contact us

E-mail: sales@vacorda.com

Factory:    0813-2629091

               0813-2629092

               0813-2629093

ChengDu:  028-87362258

               028-87362290

After-saler: 0813-3212061


Address: Guanghua Rd, Qingyang Dist, Chengdu, Sichuan Province, China

The main factors affecting the up and down fluctuations of the superheated steam flowmeter

Author:    Source:    Date: 2021-05-25 15:28:11
Steam is reminiscent of high temperatures, ranging from about 100 to about 300. In fact, there are many factors that affect the fluctuation of the steam meter, such as temperature, installation, pressure and so on. The steam output under different pressures is different, and different factors will cause the steam meter to measure; the reasons for the inaccuracy of the superheated steam flowmeter and the factors that affect its accurate measurement mainly include the following six aspects.

(1) The upstream and downstream straight pipe sections are insufficient.

For traditional vortex or orifice flow meters, straight pipe sections are required to be installed before and after 20D and 5D respectively. If the upstream and downstream straight pipe sections are insufficient, the fluid will not develop fully, and turbulence and velocity profile distortion will occur. The distortion of the velocity profile is usually caused by local obstacles (such as valves) or bends in the pipeline, while the vortex is usually caused by two or more spatial (three-dimensional) bends. The shortcomings of the upstream and downstream straight pipe sections can be adjusted by installing flow regulators. The simplest and most effective method is to use a flow meter with lower requirements for upstream and downstream straight pipe sections.

(2) The turndown ratio is insufficient.

Turndown ratio refers to the ratio of the maximum flow rate and the minimum flow rate that the flowmeter can measure within a given range of accuracy and reproducibility. But you must be cautious in terms of turndown, because turndown is based on the actual flow rate. The maximum allowable speed of the steam system is generally 35m/s. Higher flow rates will cause corrosion and noise in the system. Different flowmeters allow different minimum flow rates. Generally, the minimum steam flow rate measured by a vortex flowmeter is 2.8m/s. When the turndown ratio is insufficient, a flowmeter with a large turndown ratio or multiple flowmeters in parallel should be used.

d6efc6a9

Guanghua Rd, Qingyang Dist, Chengdu, Sichuan Province, China 备案号:蜀ICP备13021392号-1