TransColorado Gas Transmission Company
Original Volume No. 1
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Effective Date: 05/15/2000, Docket: GT00- 25-000, Status: Effective
First Revised Sheet No. 236 First Revised Sheet No. 236 : Superseded
Superseding: Original Sheet No. 236
GENERAL TERMS AND CONDITIONS
10.1 Unit of Measurement and Metering Base. The volumetric
measurement base shall be one cubic foot of gas at a pressure base of
14.73 psia, at a temperature base of 60 degrees Fahrenheit, without
adjustment for water vapor.
10.2 Atmospheric Pressure. For the purpose of measurement, the
atmospheric pressure shall be the barometric pressure calculated for the
elevation at the point of measurement.
10.3 Temperature. The temperature of the gas shall be determined
at the points of measurement by means of a properly installed recording
thermometer or continuous electronic transducer input to a computer that
conforms to A.P.I. Standard 21.1 installed in accordance with the
recommendations contained in ANSI/API 2530 (Orifice Metering of Natural
Gas), as amended from time to time. The arithmetic average of
temperatures for each day shall be used in computing temperatures of the
gas during such day for conventional chart measurement. When electronic
computer measurement is used, average daily temperature will be computed
as a running average of data determined by computer scan.
10.4 Determination of Gross Heating Value and Specific Gravity.
Where TransColorado elects to install electronic computer measurement
equipment and field chromatographs, the determination of gross heating
value and specific gravity shall be made from the composition by
calculation using physical gas constants for gas compounds as outlined in
GPA Standard 2145 (Table of Physical Constants of Paraffin Hydrocarbons
and Other Components of Natural Gas) with any subsequent amendments or
revisions that TransColorado may adopt.
Where TransColorado elects to install conventional chart
measurement, the arithmetic average of the hourly heating value and
specific gravity recorded during periods of flow each day by a recording
calorimeter and gravitometer or recording chromatograph, if installed,
shall be considered as the gross heating value and specific gravity of the
gas delivered during each day. If a continuous gas sampling device is
used, determinations shall be made not less than once every month. Such
determinations shall be considered as the gross heating value and specific
gravity of all gas delivered during the applicable sampling period.