Wikipedia has an excellent entry discussing the flows through an orifice plate. Included in the entry is the equation for calculating the permanent pressure loss across the plate.
Information: Catalog and Supplier Database for Engineering and Industrial Professionals.
Office of NEPA Policy and Compliance CX-022989: Install Orifice Plates, Flammable Gas Cylinders in 773-A Section C Labs Installation of flow restricting orifices on flammable gas cylinder ...
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