Westgas Interstate, Inc.

First Revised Volume No. 1

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Effective Date: 09/01/1993, Docket: RS92- 89-002, Status: Effective

Original Sheet No. 42 Original Sheet No. 42 : Effective




periods of flow each day by a recording calorimeter and

gravitometer or recording chromatograph, if installed,

shall be considered as the gross heating value and

specific gravity of the gas delivered during each day.

In the event a continuous gas sampling device is used,

determinations shall be made not less than once every

month. Such determinations shall be considered as the

gross heating value and specific gravity of all gas

delivered during the applicable sampling period. Gross

heating values and specific gravities determined from

spot samples will be used in calculating gas delivered

for the day on which the test is made and all following

days until the next test is made. The calculations

(for Btu) shall be based on dry gas if the gas at the

measurement points contain less than 5 pounds of water

per Mmcf. If the gas at the measurement points contain

more than 5 pounds of water per Mmcf. the appropriate

factor will be applied to the Btu calculations to

correct for water content in excess of 5 pounds per

Mmcf. The difference between Btu's received by

Transporter and Btu's delivered to Shipper, as

adjusted, shall be deemed unaccounted-for gas. Shipper

shall provide its proportionate share or pay it portion

of unaccounted-for gas and shall be responsible

for unauthorized overrun gas which is vented.


5.5 SUPERCOMPRESSIBILITY. The measurement of gas

shall be corrected for deviation from Boyle's Law at

the pressures and temperatures under which gas is

measured by use of the calculation appearing in the

manual entitled "PAR Research Project NX-19, Extension

of Range of Supercompressibility Table," AGA Catalog

No. 48/PR published by the American Gas Association in

1963 as supplemented or amended from time to time.

Inert content of the metered gas stream used in the

Formula NX-19 calculations shall be determined by a

chromatographic analysis using spot sampling when

deliveries begin and thereafter by (i) chromatographic

analysis not less than semiannually, (ii) continuous

sampling or (iii) by continuous computer input at each

of the points where the gas is received and delivered.


5.6 MEASURING EQUIPMENT. Unless otherwise agreed upon,

Transporter will install, maintain and operate or cause

to be installed, maintained and operated measuring

stations equipped with flow meters and other necessary

metering and measuring equipment by which volumes of