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Title: Design Of Meter Tubes And Primary Elements
Author: Ralph H. Clemons, Jr.
Source: 1966 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1966
Abstract: The term primary element is generally used to describe a device producing a primary signal of some sort. Coupled with the primary device is a secondary element which uses the signal for indication, recording, or operating purposes. In cases to be covered by this paper, the primary element describes a signal producing orifice plate and the fittings with which it is held in the proper metering position in the line. As the adjacent piping also effects the resulting primary signal it must also be considered a part of the primary element. Therefore, the title assigned to the paper maybe considered a bit improper as meter tubes are actually an integral part of the primary element. The overall accuracy of an orifice metering installation is certainly dependent on many factors. To insure excellence in metering, it is the duty of the measurement engineer and field meter man to specify and maintain equipment which will adequately handle the metering situation. He also must be conscious of the maintenance so that the equipment will be long lived, and the high standards of accuracy will be upheld. It is the purpose of this paper to describe the various types of equipment available for gas measurement and to outline the design features and applications in which certain requirements should be specified.

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