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Title: The Foxboro Orifice Meter
Author: H. K. Spink
Source: 1938 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1938
Abstract: H E COMPLETE orifice meter, besides the Recorder whloh is the most evident part of the mechanism, is composed of an orifice plate which serves as a restriction and causes the drop in pressure which registers on the Recorder, a flange union which holds the orifice plate, a set of pressure taps, and the section of line leading to and from the orifice. These latter accessories are just as important and are much more likely to get out of order than the Recorder itself. In order to obtain an accurate measurement of flow, the following conditions must be fulfilled: An accurate differential pressure, accurately related to Che rate of flow, must be created this differential pressure must be conveyed to the Recorder the Recorder must make an accurate record of this differential an accurate static pressure must be conveyed :o the Recorder the Recordermust accurately register ihis static pressure accurate readings of gravity and flowing temperature must be used in computing an accurate coefficient and an accurate method of reading the charts must be applied in connection with :his coefficient.

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