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Title: Selection And Measurement Of Meter Tubes
Author: Homer H. Swarner
Source: 1982 Appalachian Gas Measurement Short Course
Year Published: 1982
Abstract: In the gas measurement industry, the term primary element generally refers to the orifice plate, the orifice plate holding device, the meter tube, pressure taps, and straightening vanes. The meter tube, the third component of the primary element, consists of the inlet and outlet sections of pipe adjacent to the orifice fitting. The meter tube greatly affects the overall accuracy of the primary element therefore, careful attention must be given to its fabrication. Because of this, the manufacture of meter tubes, like that of orifice meters and orifice fittings, has become a considerable science. Meter tubes should adhere to the standards recommended in the American Gas Association (AGA) Gas Measurement Committee Report No. 3 (Revised 1969). Adherence to these standards will ensure control of the condition of gas flow adjacent to the orifice. Recommended standards contain specifications for inside condition and length of pipe sections adjacent to an orifice.

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