| 1. | Under choked conditions, valves and calibrated orifice plates can be used to produce a desired mass flow rate.
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| 2. | Some of these reservoirs are constructed across the river line, with the onward flow controlled by an orifice plate.
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| 3. | Orifice plates are also used to reduce pressure or restrict flow, in which case they are often called restriction plates.
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| 4. | The most common method of measuring gas flow is via differential pressure across an orifice plate inserted into a flow metering pipe.
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| 5. | For example, in the case of an orifice flow meter, the differential pressure across the orifice plate is the primary flow element.
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| 6. | Orifice plates as flow meters typically have a 5 to 1 speed range, while turbine meters may have up to 100 to 1 range.
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| 7. | A venturi meter is more efficient, but usually more expensive and less accurate ( unless calibrated in a laboratory ) than an orifice plate.
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| 8. | Orifice plates are small and inexpensive but do not recover the pressure drop as well as a venturi, nozzle, or venturi-nozzle does.
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| 9. | However a newer V-Cone technology ( the inverse of orifice plate technology ) is being used to more accurately meter gas that contains some liquids.
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| 10. | There are several situations in which choked flow occurs, such as the change of cross section in a de Laval nozzle or flow through an orifice plate.
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