Great Lakes Gas Transmission Limited Partner
Second Revised Volume No. 1
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Effective Date: 04/27/2001, Docket: RP01-272-000, Status: Effective
Third Revised Sheet No. 17 Third Revised Sheet No. 17 : Effective
Superseding: Second Revised Sheet No. 17
GENERAL TERMS AND CONDITIONS
6.1 The unit of volume for the purpose of measurement shall be one thousand cubic feet of gas at a
temperature base of sixty degrees (60°) Fahrenheit and a pressure base of 14.73 pounds per
square inch absolute (psia). The Dekatherm equivalent of such unit of volume shall be
determined by multiplying each such unit of volume by the total heating value per cubic foot of
the Gas delivered hereunder (adjusted to a common temperature and pressure base) and by dividing
the result by one thousand (1,000).
6.2 The average absolute atmospheric (barometric) pressure at each point of receipt and each point
of delivery shall be assumed to be fourteen and four-tenths (14.4) pounds per square inch,
irrespective of the actual location or elevation above sea level of the point of receipt or
point of delivery or of any variation in actual atmospheric pressure from time to time.
6.3 The flowing temperature of the gas(es) shall be determined by means of an instrument of standard
manufacture accepted in the industry for this purpose.
6.4 The supercompressibility factor used in computing the volume of gas delivered through an orifice
meter shall be determined in a manner consistent with the method contained in the American Gas
Association "Manual for the Determination of Supercompressibility Factors for Natural Gas (NX-19
Report)" or American Gas Association "Compressibility Factors of Natural Gas and Other Related
Hydrocarbon Gases" (AGA Report No. 8),as such publications may be revised from time to time.
6.5 The specific gravity of the gas used in computing the volume of gas delivered shall be
determined at intervals of not more than thirty (30) Days by means of an instrument(s) of
standard manufacture accepted in the industry for this purpose using a sample of gas, or a
representative sample of gas, of the gas stream flowing to the point of receipt or point of
6.6 The compressibility ratio factor "s" used in computing the volume of gas delivered through a
turbine meter or a positive displacement meter shall be determined by the equation s = (Fpv)2,
in which "Fpv" is the supercompressibility factor determined as described in Subsection 6.4,
6.7 In determining the flowing temperature factor, supercompressibility factor, and compressibility
ration factor "s" for use in computing the volume of gas delivered through a meter, the flowing
gas temperature for only the period(s) of time that gas was flowing through the meter shall be
6.8 The cutoff for the closing of measurement is five (5) business days after month end.