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Title: Calculation Op Orifice And Displacement Meter Charts
Author: m. W. Patterson
Source: 1938 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1938
Abstract: THE measurement of gas we are confronted with problems much different than in measuring oil or other commodities. Oil may be stored for future use and measured when convenient, but gas being of a different nature must be measured at the time it is produced or consumed, by meters especially adaptable for this use. The meters used by the industry at this time are the Orifice and the Positive displacement meter, with or without a recording pressure gauge. The meters record conditions on chart records at the time the gas passes, which recordings become the basis of calculating volumes. As this record cannot be dupUcated after the gas has passed the point of measmement, It is imperative that an accurate recording be obtained on the chart. The care and operation of meters is another subject and is covered more fully in another class at the school but being so closely connected with the calculation of tlie charts, a few remarks concerning the meters are not out of place in this discussion. Unless the meters are function Lng properly and are recording correct conditions, it would not matter how carefully a chart is read, an incorrect result would still be obtained. A good meter attendant or chart changer is an essential factor in obtaining correct gas measurement. The two methods of measuring gas and the calculating of the different type charts should be studied as individual subjects.

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