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Title: Sales Meter And Regulator Station Designs Including Standardization, Primary Elements, And Meter Tubes
Author: Rex W. Landry
Source: 1966 Appalachian Gas Measurement Short Course
Year Published: 1966
Abstract: In sales measLiremenl and pressure regulating stations, the primary measurement element is of basic concern in design. For volumes of gas normally encountered the sharp edged orifice plate is the most commonly used. Of course, for smaller flows positive displacement and rotary type meters arc often used. For the purpose of this discussion I shall limit the coverage to the sharp edged orifice plate. The AGA Committee Report #3 is the guide line used by most companies in gas measurement for design lengths, diameter tolerances, etc. Most companies with many and varied types of installations Iry and standardize their meter tuhe lengths, taking into account the maximum Beta Ratio to be expected, and the maximum potential flow disturbance upstream such as regulators, partially opened valves, and 90 degree bends. A typical conservative specification would be based on a .75 Beta Ratio and an AGA Figure 6 installation for meter tube design tolerances. The lengths computed on (his basis are the minimiun recommended lengths, and many companies prefer to add extra lengths where space and physical location will permit them to do so. The use of straightening vanes greatly reduces the required upstream approach length. Good versatile design for stations with increased load possibility may indicate that the use of a meter tube of such length so that the next larger size meter tube or tubes could be installed without a major revision of the station.

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