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Title: Repair And Maintenance Of Hard Case Positive Meters
Author: J. W. Sutton
Source: 1966 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1966
Abstract: Every modern industry must have an accurate method of determining sales revenue for services rendered or products distributed. In the gas distribution system this accounting is done primarily with positive displacement meters with particular emphasis on domestic or residential meters. From a theoretical view, all meters should be 100% accurate but this is virtually impossible to achieve. Since labor costs, gas conditions, areas covered and climate to which equipment is subjected all enter into the total cost per year per operating unit, each company must decide how much they can profitably spend on achieving accuracy. Savings can be increased at the expense of accuracy to a certain extent or, at the other extreme, excellent accuracy can be maintained at a considerable cost. A balance between cost and accuracy whereby a company receives the most favorable results in relation to expenditures can only be achieved through a careful study of recorded performance. These records are the only true means of determining the routine test interval and the best repair policy to follow once the meter reaches the shop. Meter records are usually kept in one of two ways: selective method or continuous method. In the selective method records are kept on a certain percentage of the meters and performance data on the sample is assumed to be very nearly an overall pattern. This method will prove satisfactory provided a group is chosen that will be large enough to be truly representative of the total. The continuous method would involve keeping a complete record on each meter from the purchase date throughout its useful life.

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