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Title: Mechanical Readout Devices
Author: Raymond G. Kremer
Source: 1975 Appalachian Gas Measurement Short Course
Year Published: 1975
Abstract: When a utility purchases gas from a pipeline transmission company, it does so at an agreed set of conditions of pressure and temperature. Then, regardless of the actual pressure and temperature at which the gas is delivered, when the utility is billed for this gas, the volume is corrected and related back to the agreed base conditions. The fact that pipeline gas is delivered at relatively high pressures, and since natural gas is a mixture of several gases and thus deviates from the basic laws of physics pertaining to perfect gases, results in still another factor being introduced, called supercompressibility. When the utility sells this gas along with any additional supplies that it may have produced, it is important that the sum total of this send-out can be related to the purchases and other sources. If it does not, the problem of unaccounted for gas rears its ugly head.

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