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Title: Determination Of Leakage And Unaccounted-For Gas In Distribution Systems
Author: Cleo V. Cearley
Source: 1966 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1966
Abstract: Todays competitive markets force every organization desiring to stay in business to inspect all facets of its operations from the standpoint of economy and customer goodwill. Unaccounted for gas losses are an economic loss and leakage can range from a nuisance to a serious hazard resulting in litigation and poor customer relations. Gas delivered or going into a distribution system is measured at the city border station and is again measured upon delivery to the customer. The difference in these two measurements is reflected by the leakage and unaccounted for gas report. The gas measurement manual of the American Gas Association defines unaccounted for gas as The difference between the amount of gas made and-or bought by a distribution system and the amount of gas sold, used in the system and known to be lost. This would not imply that the difference in the city border measurement and the plant measurement that is the amount of gas lost, would present a precise leakage picture for the system being analyzed, though this should be the aim. There are numerous ways of reporting leakage and unaccounted for gas. One of the more common is a year ending figure with losses and-or gains being expressed in M c.f. per mile of three inch equivalent. The three inch equivalent allows comparison of one system with another. While the year ending figure is not a completely correct analysis of leakage, it does give a truer picture than can be gained from monthly figures. Generally the year ending figure for the months of July and August, when consumption is at a minimum, are the best indicators of system leakage.

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