Oktex Pipeline Company

Original Volume No. 1

Effective Date: 07/01/1999, Docket: RP99-332-000, Status: Effective

First Revised Sheet No. 25 First Revised Sheet No. 25 : Effective

Superseding: Original Sheet No. 25

7. The deviation of the natural gas from Boyle's Law shall be determined

by the use of the table of formulas published by the American Gas Association

Par Research Project NX-19 corrected for carbon dioxide and nitrogen or any

superseding applicable tables published by the American Gas Association.

Determinations of the molecular percentage of N2 and CO2 in the gas shall be

made within thirty (30) days after commencement of deliveries and at least

quarterly thereafter. The molecular percentage of N2 and CO2 thus determined

will be used to determine the supercompressibility factors during the ensuing

period with corrections for specific gravity, temperature and pressure.

8. The latest issue of Gas Processors Association Publications 2172,

"Method for Calculation of Gross Heating Value, Specific Gravity, and

Compressibilities of Natural Gas Mixtures from Compositional Analysis,"

contains the physical factors used to calculate Heating Value and specific

gravity from a gas analysis and shall be used as the basis for determining

Heat Content.

VI. MEASURING EQUIPMENT

1. Measuring Station. Transporter will install, maintain and operate at

its expense, at or near the Delivery Point(s), a measuring station properly

equipped with meters and other necessary measuring equipment by which the

volume of natural gas made available to or on behalf of Shipper shall be

measured and determined in accordance with Article V of these General Terms

and Conditions.

a. Orifice Meters. Orifice meters, if used, shall be installed and gas

volumes computed, in accordance with American National Standard Bulletin

ANSI.API 2530, Orifice Metering of Natural Gas, dated June 1979, and any

modification and amendments thereof, and may include the use of flange

connections and straightening vanes.

b. Diaphragm, Rotary, or Turbine Meters. Diaphragm, rotary, or turbine

meters, if used, shall be installed and gas volumes computed in accordance

with generally accepted industry practices.

c. Electronic Flow Computers. If the use of electronic or other types

of flow computers is mutually agreeable to Transporter and Shipper, they may

be installed and volumes calculated in accordance with generally accepted

industry practices.

d. New Measurement Techniques. If at any time a new method or

technique is developed with respect to gas measurement or the determination of

the factors used in such gas measurement, such new method or technique may be

substituted upon mutual agreement thereto by the parties.

2. Check Measurement Equipment. Shipper may install, maintain and

operate, at its own expense, such check measuring equipment as desired,

provided that such equipment shall be so installed as not to interfere with

the operation of Transporter's measuring equipment at or near any Delivery

Point.