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Title: Orifice Meters
Author: Lewis P. Emerson
Source: 1965 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1965
Abstract: Terms like Mass Flow Meter, Turbine Meter, Displacement Meter, Vortex Meter, Electro-magnetic Meter, and Compensated Orifice Meter have appeared in advertisements and been the subject of lectures at this Short Course with increasing frequency. All these terms relate to suggested means for measuring gas flow volumes. It is to be expected in so important an industry as Natural Gas that better methods for measuring gas are being sought continually. A better method might refer to a more accurate measurement, a more simple or fundamental principle of operation, a cheaper installation, a more maintenance-free meter, or more convenient read-out. No matter what the consideration, an orifice meter stands up well in any comparison. That this is so is evidenced by user acceptance. It is an easily understood device both from the standpoint of construction and calculating procedures. It has been in use for almost 50 years in its present form-the last 25 with nearly all its present refinements. An orifice meter is not just an orifice plate. This term refers to the complete installation that is: (a) a thin-plate square-edged orifice plate or primary device, installed in its meter run, plus (b) the sensors and/or read-out or secondary devices, particularly the differential pressure and static pressure sensors and sometimes a temperature recorder and a specific gravity meter as well, and lastly (c) the connecting fittings or pressure leads. The proper setting or installation of each part is essential to attain the best and most accurate gas flow measurements.

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