Significance of online calibration of large-diameter orifice flow meter

Abstract: The information on the significance of online calibration of large-diameter orifice flowmeters is provided by excellent flowmeter and flowmeter manufacturers. Most of the large-diameter orifice flowmeters are installed in the main water supply line, and it is difficult to obtain the opportunity to stop the water for inspection. Due to the inconvenience of disassembly, and most of the orifice flowmeters are installed in underground instrument wells, they cannot even be disassembled, and they are mostly used for accounting water plants. Important parameters of production, check. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the meaning of the online calibration of large-diameter orifice flowmeters. Most of the large-diameter orifice flowmeters are installed in the main water supply line, and it is difficult to obtain the opportunity to stop the water for inspection. Due to the inconvenience of disassembly, and most of the orifice flowmeters are installed in underground instrument wells, they cannot even be disassembled, and they are mostly used for accounting water plants. Important parameters of production, verification or calibration issues are particularly important. As we all know, the use effect of the flowmeter is not only related to the orifice flowmeter itself, but also to its installation environment and use conditions. The inspection can only solve the problem of the orifice flowmeter itself, and only online verification or calibration can solve this problem. Therefore, the online verification or calibration of large-diameter orifice flowmeters is of great significance. 1. Solve the problem that most of the orifice flowmeters in use cannot be sent for inspection. The difficulty of sending large-diameter orifice flowmeters for inspection is an urgent problem to be solved. This problem is particularly prominent in orifice flowmeters. The proportion of plate flowmeters is as high as 70%. Today, when water bills are increasing year by year and accounting is gradually refined, it is no doubt that orifice plate flowmeters have become the focus of people's attention, and it has also put measurement staff under great pressure. It is hoped that the problem of online calibration of large-diameter orifice flowmeters can be solved as soon as possible. 2. Eliminate additional errors caused by unsatisfactory installation and use conditions. To truly achieve accurate metering flow values, large-diameter orifice flowmeters must meet two necessary conditions: first, the accuracy and reliability of the orifice flowmeter itself is better; second, The installation environment of the orifice flowmeter must meet the specification requirements. The current actual situation is: everyone has high requirements for the accuracy of the orifice flowmeter, insufficient consideration for reliability, and even worse attention to installation and use conditions, often spending a lot of money to buy a flow rate with high accuracy Due to ignoring the adverse effects that the installation and use conditions of the flowmeter may have on its accuracy, the actual use effect is very poor, and many people even have doubts about the orifice flowmeter itself. And this problem cannot be solved only by removing the orifice flowmeter for inspection, and it must be calibrated on site to eliminate additional errors caused by unsatisfactory installation and use conditions. According to our knowledge, the installation and use conditions of large-diameter orifice flowmeters in use account for more than 60%, and most of the additional errors caused by unsatisfactory installation and use conditions may be larger than the orifice plate. The accuracy of the flowmeter itself. 3. The complexity of the influence of the installation environment and use conditions of the flowmeter on the flowmeter At present, there are two common problems in the installation environment and use conditions of large-diameter orifice flowmeters. It is required to install the orifice flowmeter in the unstable flow field area that is easily affected by the front and rear resistance parts; the second is that the design capacity does not match the actual flow rate, and the situation of large pipes and small flow often occurs. The installation conditions of large-diameter orifice flowmeters are difficult to explain clearly with one or two data. For example, an orifice flowmeter is installed behind a valve. A combination of several conditions such as opening, different flow points, etc. Therefore, it should be ensured that the orifice flowmeter should be given as long as possible straight pipe sections before and after, and the simple reference data given in the manual should not be regarded as the so-called golden rule. The large-diameter orifice flowmeters used in the water supply industry are almost all differential pressure flowmeters, and their principles are based on the functional relationship between point or line velocity and surface velocity under ideal flow field conditions. Too low will greatly reduce the accuracy of measurement. 4. Quantitative measurement uncertainty analysis How to do the flow measurement uncertainty analysis for the online calibration of large-diameter orifice flowmeters is a problem we all care about. Both international standards and national norms require calibration reports to give the measurement results. Description of uncertainty. Recently, experts from the National Institute of Metrology who are engaged in flow measurement have compiled the book 'Analysis of Uncertainty in Flow Measurement'. A monograph, the book is practical and practical according to the actual characteristics of the traffic profession. Whether it is various flow standard devices or various flow meters, it is involved, and it is a rare good reference book in the flow industry. The above is the whole content of this article,You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Significance of Online Calibration of Large Diameter Orifice Flow Meter'

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