Centra Pipelines Minnesota Inc.

Second Revised Volume No. 2

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Effective Date: 10/16/1991, Docket: RP91-136-002, Status: Effective

Original Sheet No. 21 Original Sheet No. 21 : Effective


of the gas being delivered, or, if not installed, by sampling


the gas at intervals of not more than one (1) month.



(e) The supercompressibility factor used in computing the


volume of gas delivered through a meter shall be


determined in a manner consistent with the method


presented in the American Gas Association "Manual for the


Determination of Supercompressibility Factors for Natural


Gas" (N-X 19 Report) or American Gas Association Report


No. 8 "Compressibility and Supercompressibility for Natural


Gas and Other Hydrocarbon Gases."



(f) The average absolute atmospheric (barometric) pressure at


each metering location shall be that determined in


accordance with accepted methods irrespective of variations


in actual barometric pressure from time to time.







9.1 Centra presently owns, maintains and operates at its own expense,


measuring stations properly equipped with meters and other


necessary measuring equipment by which the volume of gas to be


received and delivered shall be measured.