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How can vortex flowmeters achieve greater accuracy in measuring steam?

2019-12-06 View Original

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I. Density compensation for measuring steam with vortex flow meters must be scientific and accurate: In order to accurately measure the mass flow rate of steam, it is necessary to take into account changes in steam pressure and temperature, and compensate for the density of the steam using a flow integrator. The platinum resistance used for measuring steam temperature must be installed in accordance with relevant standards: the temperature-sensing platinum resistor should be placed at the center of the pipeline, located 5 times the diameter of the pipe downstream of the flow meter, and the pipeline where the resistor is installed should be insulated to ensure accurate temperature readings. When measuring steam pressure, it is important to note that if a pressure tap is used, zero point adjustment must be performed (as the gravity of the condensate in the pressure tap can cause a difference between the pressure measured by the pressure transmitter and the actual pressure, leading to errors in density compensation). Steam flow meters can also be adjusted using a flow integrator. The pressure transmitter is installed 4 times the pipe diameter downstream of the steam flow meter; the valves and gaskets in front of the pressure transmitter must be in good condition and unobstructed to ensure accurate measurement of steam pressure. If compensation is achieved by setting pressure and temperature, the values set should be as close as possible to the actual values; otherwise, the error will be large, and this approach is generally not recommended.   It is essential to correctly set the operating mode of the steam flow meter in the flow integrator, as this is crucial for the accurate calculation of steam costs. In applications where it is difficult to determine the steam condition accurately, it is recommended to use an intelligent flow integrator, combined with platinum resistors and pressure transmitters for temperature and pressure compensation, thereby ensuring the most accurate measurement of the steam mass flow rate. II. Proper installation of straight pipe sections upstream and downstream when using a vortex flow meter to measure steam For traditional vortex flow meters, the required lengths of straight pipe sections ahead of and behind the meter are 20 times the pipe diameter and 5 times the pipe diameter respectively (this is a technical requirement ensuring that there are no obstacles such as valves in front of the meter) ; If there are obstacles, additional straight sections must be added; see the manufacturer’s instructions for details). If the straight sections upstream and downstream are insufficient, it will result in inadequate development of steam flow within the pipeline, causing distortions in the velocity distribution profile. Users can adjust the flow velocity distribution in the pipeline by installing a flow regulator in front of the steam flow meter or by adding straight pipe sections, so that the fluid at the steam flow meter is in a fully developed state. For some large-diameter steam flowmeters, it is more important to meet the installation requirements for the straight pipe sections upstream and downstream. For more information, please visit the company’s official website at http://www.yb1518.com/. Please keep this link when reproducing the content! http://www.yb1518.com/UploadFiles/20175239314754.jpg

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