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Title: Designs To Achieve Accurate Measurement, Flexibility, Expansibility, Low Noise Level, Good Pressure Regulation, Standardization, And Compliance With Applicable Codes, Statutory Regulations, And General Ecology
Author: Rex W. Landry
Source: 1971 Appalachian Gas Measurement Short Course
Year Published: 1971
Abstract: In sales measurement and pressure regulating statiom, the primary measurement element is of basic concern in design. For volumes of gas normally encountered, sharp edged orifice plate is the most commonly used. Of course for smaller flows, positive displacement, rotary type, and turbine type meters are often used. 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 standardize their meter tube 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 this basis are the minimum recommended lengths, and many companie 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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