Oktex Pipeline Company
Original Volume No. 1
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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
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
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
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