Canyon Creek Compression Company

Third Revised Volume No. 1

Effective Date: 12/01/1993, Docket: RS92- 57-003, Status: Effective

Original Sheet No. 171 Original Sheet No. 171 : Effective

GENERAL TERMS AND CONDITIONS

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19. MEASUREMENT

19.1 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.

19.2 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.

19.3 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 determined by Canyon 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.

19.4 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, the