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Can you tell me what are the characteristics of orifice plates?
When the fluid in the pipeline flows through the throttling device inside the pipeline, the flow beam will form a local contraction at the throttling element of the throttling device, thereby increasing the flow velocity and reducing the static pressure. As a result, a pressure drop, or pressure difference, is generated before and after the throttling element. The larger the flow rate of the medium, the greater the pressure difference generated before and after the throttling element. Therefore, the size of the fluid flow can be measured by measuring the pressure difference.. This measurement method is based on the laws of energy conservation and flow continuity. The intelligent throttling device (flowmeter) is a new generation flowmeter that integrates flow, temperature, and pressure detection functions, and can automatically compensate for temperature and pressure. The instrument adopts advanced microcomputer technology and micro power consumption new technology, with strong functions, compact structure, easy operation, and convenient use. The orifice plate has an international standard (ISO5167). By measuring the pressure difference at both ends of the orifice plate, a flow rate value with certain accuracy can be calculated according to this standard. The pressure measurement methods for orifice plates are specified in international standards as three types: radial pressure measurement, flange pressure measurement, and corner pressure measurement (with pressure measurement holes adjacent to the orifice plate). When measuring liquids or gases containing a small amount of solid or liquid, in order to facilitate the passage of a small amount
2. Advantages and disadvantages of Venturi flowmeter
Advantages: If it can be manufactured accurately according to ASME standards, the measurement accuracy can also reach 0.5%. However, due to manufacturing technology issues, it is difficult to guarantee the accuracy of domestically produced Venturi, and Kaifeng Instrument Factory, which has strong technical strength, can only guarantee a measurement accuracy of 4%. For ultra supercritical power generation conditions, the use of the pressure equalization ring at the throat is a very dangerous link. Without using the pressure equalization ring, it does not comply with ASNE ISO5167 standards, and the measurement accuracy cannot be guaranteed. This is a contradiction in high-pressure classic Venturi manufacturing. Disadvantage: The throat is made of the same material as the inlet/outlet, and the fluid has severe erosion and wear on the throat, which cannot guarantee long-term measurement accuracy. The structural