Northern Natural Gas Company

Fifth Revised Volume No. 1

Effective Date: 11/01/1993, Docket: RS92- 8-004, Status: Effective

Original Sheet No. 209 Original Sheet No. 209 : Effective

GENERAL TERMS AND CONDITIONS

one cubic foot of gas at an absolute pressure of 14.73 pounds and a

temperature of sixty degrees Fahrenheit (60 F).

COMPUTATION OF VOLUMES OF GAS:

Measurement Factors. The volume of gas delivered as measured by

pipeline pressures shall be corrected to the unit of

measurement. Measurement and determination of volume delivered

shall be made in accordance with the recommendations set forth

in the A.G.A. Gas Measurement Committee Report Number Three

latest edition for orifice meters or (the A.G.A. Gas

Measurement Committee Report Number Seven latest edition, for

turbine meters or industry standards for other meters).

Temperature. The temperature of the gas passing through the

meters shall be determined by the use of a continuous recording

thermometer so installed that it will record properly the

temperature of the gas flowing through the meters.

The daily temperature, based on the arithmetic average of the

hourly temperature so recorded shall be used in measurement

computation. Provided that, in case of small volume delivery,

the installation of a thermometer may be omitted at the election

of Northern, and in any such case, the temperature of the gas for

the purpose of measurement shall be assumed to be sixty degrees

Fahrenheit (60 F).

Specific Gravity. The specific gravity of the gas shall be

calculated from chromatographic analysis of a representative gas

sample.

Atmospheric Pressure. The normal barometric pressure in pounds

per square inch, carried to one decimal place, for each Point(s)

of Delivery, shall be used as the atmospheric pressure for

measurement purposes.

Heating Value. The heating value of the gas delivered shall be

calculated from a chromatographic analysis of a representative