Wedge flow meter use and attention points

Abstract: The information on the use and attention of the wedge-type flowmeter is provided by the excellent flowmeter and flowmeter production and quotation manufacturers. 1. Elimination of impurity blockage It can be seen from the structure of the wedge-type flowmeter that the wedge is installed on one side of the meter body, and the flow area is between the wedge and the inner cavity of the meter. This structure is effective for impurities and particles in the medium. Even larger slag can flow through the wedge with the fluid. For more flowmeter manufacturers to select models and prices, you are welcome to inquire. 1. Elimination of impurity blockage It can be seen from the structure of the wedge-type flowmeter that the wedge is installed on one side of the meter body, and the flow area is between the wedge and the inner cavity of the meter. This structure is effective for impurities and particles in the medium. Even larger slag can flow through the wedge flowmeter with the fluid without accumulating in the meter body, so it can be used in the measurement of fluids containing particulate impurities that cannot be used by orifice flowmeters. 2. It is suitable for more conditions when the throttling wedge is welded to one side of the inner cavity of the instrument. The head (pressure) loss generated by the fluid passing through the meter body is much smaller than that of the throttling orifice with the middle opening. Therefore, for the hydrostatic The additional head loss in the pressure-to-pressure conversion process is much smaller than that of an orifice flow meter. The wedge flowmeter is suitable for a wider range of fluid viscosity, and can be used in the measurement of crude oil, sewage oil, wax oil, fuel oil and even asphalt with high viscosity, and is widely used in the process of petroleum refining. 3. The pressure taking method is changed. The flange pressure taking method of the wedge-type flowmeter simplifies the structure of the throttling element + differential pressure transmitter to measure the fluid flow. By using the double flange transmitter mode, it can not only save the pressure pipe, The laying of the heating wire and the stability of the filling of the silicone oil in the capillary of the double flange transmitter significantly improve the accuracy of the measurement process of the throttling element. It fundamentally overcomes the additional error caused by the qualitative change of the static medium in the pressure-inducing pipe of the throttling element, reduces the failure rate and maintenance frequency of the flow meter, and improves the measurement accuracy of the wedge-type flowmeter as a whole. 2. Installation 1. Install according to the direction marked by the wedge flowmeter. Although some articles and materials say that there is no direction requirement for the installation of the wedge flowmeter, it can be used for the measurement of reverse flow. From the measurement principle of the wedge flowmeter See if it is a standard V-shaped wedge, its throttling of the fluid is the same. However, on the body of the wedge flowmeter, the manufacturer has marked the flow direction arrow of the wedge flowmeter fluid. Looking at the flanges at both ends of the wedge flowmeter, the installation position of the wedge is not in the wedge flowmeter. Therefore, we should install the wedge flowmeter according to the marked direction to prevent the wrong installation direction from increasing the measurement error. The flow direction of the fluid is marked on the body of the wedge flowmeter. Picture 16.png2. Regarding the direction of the pressure-taking interface, according to the pressure-taking and pressure-taking specifications of the measuring instrument, when measuring the gas flow, the pressure-taking port is in the middle and upper part of the throttling element. When measuring liquid flow, the pressure taking port is at the middle and lower side of the throttling element, and when measuring dirty medium, the pressure taking port is in the middle of the throttling element. However, the difference between the wedge flowmeter and the orifice flowmeter is that the throttling wedges are not evenly distributed in the inner cavity of the meter, and the manufacturer has prefabricated the position of the pressure taking port, which is at the front and rear of the wedge welding. . If the pressure taking specification is strictly followed, when measuring liquid, if the pressure taking port is installed in the middle and lower part of the pipeline, then the wedge inside the wedge flowmeter is also in the middle and lower part of the pipeline, causing the fluid to flow from the wedge flowmeter. This method will cause the impurity particles of the medium in the fluid to precipitate in the lower body cavity of the wedge flowmeter, which may block the pressure tap in front of the wedge block, which may easily cause the flowmeter to fail. Therefore, during the on-site installation process To be treated differently according to the actual situation. 3. It is recommended to install the wedge-type flowmeter horizontally in the vertical pipeline, and reduce the vertical installation method as much as possible, because during the vertical installation process, the zero-point calibration of the wedge-type flowmeter cannot be carried out. When the zero-point calibration of the wedge-type flowmeter is required, the working medium is filled with the wedge-type flowmeter, and then the front and rear valves of the pipeline are closed, and the flowmeter is calibrated under the condition of ensuring that the fluid inside the wedge-type flowmeter is static. Since the flow meter of the throttling element is generally not designed with a secondary line cut-off facility, there is generally no process cut-off valve before and after the throttling element, and it is difficult to calibrate the wedge-type flowmeter under this condition. If the wedge flowmeter is installed horizontally, we can think that the static fluid has no additional effect on the differential pressure detected by the wedge flowmeter, so we only need to close the front and rear pressure taking valves of the wedge flowmeter and release the pressure to the atmosphere. Zero calibration of the flowmeter. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Wedge Flow Meter Use and Attention Points'

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