Transcolorado Gas Transmission Company LLC
Second Revised Volume No. 1
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Effective Date: 12/28/2007, Docket: RP08-167-000, Status: Effective
Original Sheet No. 261 Original Sheet No. 261 : Effective
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.