Northern Natural Gas Company
Fifth Revised Volume No. 1
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Effective Date: 11/01/2003, Docket: RP03-398-011, Status: Effective
First Revised Sheet No. 210 First Revised Sheet No. 210 : Effective
Superseding: Original Sheet No. 210
GENERAL TERMS AND CONDITIONS
gas sample collected daily during the month, or any other method
mutually agreed upon. Such chromatographs shall be owned, operated
and maintained by Northern at representative locations on Northern's
transmission system, or as agreed upon.
The heating value of the natural gas received by Northern from its
various sources of supply and of gas received for transportation will
vary. However, Northern will operate its system such that the
heating value will not fall below 950 Btu per cubic foot.
The unit of volume "at 1,000 Btu per cubic foot" or "as adjusted to
1,000 Btu per cubic foot" shall mean one cubic foot of gas as defined
above and having an average total heating value of one thousand
(1,000) British Thermal Units. Such units of volume shall be
determined by multiplying the number of cubic feet of gas delivered
during any billing day by the factor arrived at by dividing the
average total heating value per cubic foot delivered on the previous
day by 1,000 unless otherwise agreed to by Northern.
To the extent that Northern does not have chromatograph information
for a Field Area point, and if the Btu changes after the 20th of the
production month, such Btu change will not become effective until the
beginning of the following month. If the Btu changes during the
period from the first of the month through the 20th, such Btu change
can be effective for the beginning of such month.
Supercompressibility. Determination of supercompressibility of
natural gas shall be calculated from chromatographic analysis of gas
samples taken at representative points as determined by Northern.
Gas Sampling and Analysis. Gas samples may be obtained and analyzed
by one of the following methods:
Portable Chromatograph. Chromatographic analysis of a spot
sample of gas taken at a representative location and analyzed on
site by means of a portable gas chromatograph.
Spot Sample. Spot sample of gas taken at a representative
location using a sample bottle and analyzed using a gas
chromatograph at a location remote from the sampling location.
Continuous Sample. Sampling continuously into a sample bottle
for a period of time at a representative location