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Title: Operation And Maintenance Of Orifice Meters
Author: J. D. Killough
Source: 1940 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1940
Abstract: In order to obtain accurate measurement by the orifice rnctcr, you must first have a correct installation the equipment must then be kept in correct operating condition and the proper rules for interpreting the results must be followed. Our discussion is limited to second of these qualifications, and the assumption is made that the station is designed, instaUed and interpreted in compliance with the A. G.A. Gas Measurement Committee Report or Manufacturers publication under which the meter is being operated. The orifice meter consists of an orifice plate, the meter tube piping and accessory fittings, the differential and pressure recorder with manifold and leads, and auxiliary instruments of various types. As a general rule a definite testing schedule is followed, based upon terms of a contract, local operating customs and rules, and the convenience of the parties interested in the measurement. This usually occurs once a month, and consists of a calibration of the recorder, an inspection of the orifice plate, and a spot test of the recording thermometer if included in the installation. Much benefit may be derived from the proper planning of a testing schedule to fit in with the inspectors varied duties, so that the work may be accomplished with a minimum of auto mileage and time lost in back-tracking. Operating conditions will of course vary any fixed schedule, but the work should be planned for maximum efficiency, just as revenues are budgeted by the management.

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