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Orifice Plate The orifice plate flow meter is commonly used in clean liquid, gas, and steam service. It is available for all pipe sizes, and if the pressure drop it requires is free, it is very cost-effective for measuring flows in larger pipes (over 6″ diameter). The orifice plate is also approved by many standards organizations for the custody transfer of liquids and gases. The orifice plate calculation used today still differ from one another, although the various standards organizations are working to adopt a single, universally accepted orifice flow equation. Orifice plate sizing programs usually allow the user to select the flow equation desired from among several. The orifice plate meter can be made of any material, although stainless steel is the most common. The thickness of the plate used ( 1/8-1/2″) is a function of the line size, the process temperature, the pressure, and the differential pressure. The traditional orifice flow meter is a thin circular plate (with a tab for handling and for data), inserted into the pipeline between the two flanges of an orifice union. This method of installation is cost-effective, but it calls for a process shutdown whenever the plate is removed for maintenance or inspection. In contrast, an orifice fitting allows the orifice to be removed from the process without depressurizing the line and shutting down flow. In such fittings, the universal orifice plate, a circular plate with no tab, is used. The concentric orifice plate flow me
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