Trailblazer Pipeline Company

Fourth Revised Volume No. 1

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Effective Date: 12/28/2007, Docket: RP08-168-000, Status: Effective

Original Sheet No. 222 Original Sheet No. 222 : Effective

GENERAL TERMS AND CONDITIONS

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22. MEASUREMENT

22.1 UNIT OF MEASUREMENT AND METERING BASE

The volumetric measurement base shall be one (1) cubic

foot of gas at a pressure base of fourteen and seventy-three

hundredths pounds per square inch absolute (14.73 psia), at a

temperature base of sixty degrees Fahrenheit (60 F.), and without

adjustment for water vapor.

22.2 ATMOSPHERIC PRESSURE

For the purpose of measurement, calculations, and meter

calibration, the average absolute atmospheric (barometric) pressure

shall be based on the actual altitude of each point of measurement

irrespective of variations in natural atmospheric pressure from

time to time. In the event electronic computer measurement is

used, the absolute gas pressure will be measured directly, using an

absolute pressure measuring device for continuous input to the

electronic computer.

22.3 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

of standard manufacture selected by Trailblazer in the exercise of

its reasonable judgment to be installed in accordance with the

recommendations contained in ANSI/API 2530 First Edition (Orifice

Metering of Natural Gas). The arithmetic average of hourly

temperatures for each day shall be used in computing temperatures

of the gas during such day for conventional chart measurement. In

the event electronic computer measurement is used, average daily

temperature will be computed as a running average of data

determined during each computer scan.

22.4 DETERMINATION OF HEATING VALUE AND SPECIFIC GRAVITY

The Heating Value and specific gravity of the gas may

be determined by on-line recording calorimeter and gravitometer or

by recording chromatograph. In the event a continuous gas sampling

device is used, intervals mutually agreed upon should not be less

than once every month. For conventional chart measurement,