Horizon Pipeline Company, L.L.C.

Original Volume No. 1

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Effective Date: 04/18/2002, Docket: CP00-129-001, Status: Effective

Original Sheet No. 201 Original Sheet No. 201 : Effective

GENERAL TERMS AND CONDITIONS

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18. MEASUREMENT

18.1 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.

18.2 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.

18.3 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 Horizon 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.

18.4 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,