Guaranteed Accurate Metering Recommendations for Steam Flow Meters

Abstract: Guarantee the accurate measurement advice information of the steam flow meter is provided by the excellent flow meter and flow meter production and quotation manufacturers. The technicians of Heshunda flowmeter have summarized many years of experience in overhauling the steam flowmeter, and combined with the problems encountered in the installation, selection and use of the steam flowmeter, and put forward the following suggestions to ensure the accurate measurement of the steam flowmeter: 1. Steam dense. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the article to ensure accurate measurement of steam flowmeters. The technicians of the flowmeter have summed up the experience of overhauling the steam flowmeter for many years, and combined with the problems encountered in the installation, selection and use of the steam flowmeter, and put forward the following suggestions to ensure the accurate measurement of the steam flowmeter: 1. Density compensation 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. Correct installation of the upstream and downstream straight pipe sections of the steam flowmeter For the traditional vortex flowmeter, the front and rear installation 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. 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. 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 vibrations. 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”. V. Regular verification is very important in accordance with the 'Measuring Law' and GB17167-2006 'General Principles for the Equipping and Management of Energy Measuring Instruments for Energy-using Units', it is clearly stated that the measuring instruments and energy measuring instruments that are subject to mandatory verification should be verified regularly. If the verification does not meet the requirements The measuring instruments are not allowed to be used. The steam flowmeter must be checked regularly, which is the premise to ensure the correct measurement of the steam flow. Therefore, the majority of users should send the steam flowmeters they use to the local legal metrology technical institutions for metrological verification every year. If the steam flow meter is qualified, but the actual use does not feel“Inaccurate measurement”At this time, the user should find a way to solve the problem from the aspects of whether the instrument is installed correctly, type selection, instrument operating state setting, external interference, and whether the actual state of the steam has changed. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Recommendations for Assurance of Accurate Measurement of Steam Flow Meters'

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