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First Revised Sheet No. 236 First Revised Sheet No. 236 : Superseded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





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.