How to accurately measure steam and maintenance of vortex flowmeter

Abstract: How to accurately measure the maintenance information of steam and vortex flowmeters is provided by excellent flowmeter and flowmeter manufacturers. Steam flowmeter is a frequently used measuring instrument in industrial measurement, and its frequency of use is very high. How to measure it correctly, let's talk about it below. 1. The density compensation of steam should be scientific and accurate. In order to correctly measure the mass flow of steam, it is necessary. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of how to accurately measure steam and vortex flowmeter maintenance articles. As a frequently used measuring instrument in industrial measurement, steam flowmeter is used very frequently. How to measure it correctly, let's talk about it below. 1. The density compensation of steam must be scientific and accurate. In order to measure the mass flow of steam correctly, changes in steam pressure and temperature must be considered, and the steam density must be compensated by a flow totalizer. The platinum thermal resistance measuring steam temperature must be installed in a standardized way: the temperature measuring platinum thermal resistance is inserted into the center of the pipeline, the platinum thermal resistance is installed at 5 times the pipe diameter downstream of the flowmeter, and the pipeline position where the platinum thermal resistance is installed shall be insulated to ensure that the measurement The temperature value obtained is accurate. In the measurement of steam pressure, it must be noted that if the pressure induction pipe is used for pressure induction, zero point migration must be carried out (because the gravity effect of the condensed water in the pressure induction pipe will cause a certain difference between the pressure measured by the pressure transmitter and the actual pressure. The difference, causing the error of density compensation), can also be corrected in the flow totalizer. The pressure transmitter is installed at 4 times the pipe diameter downstream of the steam flowmeter. The valve and gasket in front of the pressure transmitter should be intact and unobstructed to ensure accurate measurement of steam pressure. If the set pressure and temperature are used for compensation, the set value should be close to the actual value, otherwise the error will be large, and it is generally not recommended. In the flow totalizer, it is very important to correctly set the running state of the steam flowmeter, which is very important for the correct calculation of the steam cost. For the use occasions where the steam state is not easy to be clearly judged, it is recommended to use an intelligent flow totalizer, and cooperate with platinum resistance and pressure transmitter for temperature and pressure compensation, so that the measured steam mass flow is the most accurate. 2. Vibration and electromagnetic interference existing on site should be avoided. Vortex flowmeters that are most used in steam metering are affected by design principles and are sensitive to mechanical vibration. The measurement results are susceptible to vibration interference. Reliable support should be provided for the pipe sections before and after the steam flowmeter. Design and install vibration buffer components. If pipeline vibration is inevitable, steam flowmeters with relatively strong anti-interference ability (such as gas ultrasonic flowmeters, intelligent vortex flowmeters, differential pressure flowmeters, etc.) should be selected. If there is vibration interference on the steam flowmeter site, it will affect the low-frequency pulse signal on the vortex steam flowmeter in use. The steam flowmeter will transmit these pulses as flow signals to the flow totalizer to form a cumulative flow. As a result, some vortex steam flowmeters still have a certain amount of numerical accumulation when no steam is used for a period of time. This is“The flow meter does not run without steam”Therefore, when the steam user is not using steam, they should also remember the bottom of the meter together with the steam supply unit to prevent the steam flowmeter.“empty run”. 3. The range ratio of the steam flowmeter should be reasonable. The range ratio refers to the ratio of the maximum flow rate and the minimum flow rate that a flowmeter can measure within a given range of accuracy. The user should select the flowmeter according to their actual usage. In theory, the range of the steam flowmeter to be selected should completely cover the usage range of the user. Exceeding the upper flow limit and below the lower flow limit will cause serious inaccuracy in the measurement of the steam flowmeter. For example, a vortex steam flowmeter with an actual average flow rate of 5t/h should generally choose a vortex flowmeter with a diameter of 150mm, but when the flow rate drops to 0.3t/h or exceeds 15t/h, the flowmeter will appear serious Metering inaccurate. 4. Correct installation of the upstream and downstream straight pipe sections of the steam flowmeter For the traditional vortex flowmeter, the front and rear straight pipe sections are required to be 20 times the pipe diameter and 5 times the pipe diameter respectively (this is because there are no obstacles such as valves in front of the flowmeter. Technical requirements; if there are obstacles, a straight pipe section should be added, see the manufacturer's instructions for details). If the upstream and downstream straight pipe sections are not enough, the steam flow in the pipe will not be fully developed, and the flow velocity distribution profile will be distorted. The user can adjust the flow rate distribution of the pipeline by installing a flow regulator or adding a straight pipe section before the steam flowmeter, so that the fluid at the steam flowmeter is in a fully developed state. For some large-diameter steam flow meters, it is more important to meet the installation requirements of the upstream and downstream straight pipe sections. In modern industry, intelligent vortex flowmeter is generally used to measure steam medium. So how to better protect the vortex flowmeter in use so that it has a longer service life? When it comes to vortex flowmeters, I believe everyone is familiar with them. Vortex flowmeters are a frequently used measuring instrument in industrial measurement, and their frequency of use is very high. With the rapid development of the industry today, the vortex flowmeter is a commonly used measuring instrument in industrial measurement. In the case of long-term and high-frequency use, the loss of the internal measurement components of the vortex flowmeter during use is important for its service life. have some influence.

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