Canyon Creek Compression Company

Third Revised Volume No. 1

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Effective Date: 12/01/1993, Docket: RS92- 57-003, Status: Effective

Original Sheet No. 172 Original Sheet No. 172 : Effective

 

GENERAL TERMS AND CONDITIONS

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arithmetic average of the hourly Heating Value and specific gravity

recorded during periods of flow each day by a recording calorimeter

and gravitometer or recording chromatograph, if installed, shall be

considered as the Heating Value and specific gravity of the gas

delivered during each day. In the event electronic computer

measurement is used, the determination of Heating Value and specific

gravity from chromatograph or calorimeter and gravitometer

transducers shall input continuously into the computer for volume

calculations. In the event a continuous gas sampler is installed,

then the Heating Value and specific gravity shall be determined in

the laboratory by chromatograph and/or running a portion of test

sample through a calorimeter and gravitometer. Such determinations

shall be considered as the Heating Value and specific gravity of all

gas delivered during the applicable period of sampling. Heating

Values and specific gravities will be used in calculating gas

delivered for the day on which the test is made, and for all

following days until the next test is made. All Heating Value and

specific gravity determinations made with a chromatograph shall use

physical gas constants for gas compounds as outlined in ANSI/API

2530 First Edition ("Orifice Metering of Natural Gas") with any

subsequent amendments or revisions which Canyon may adopt in the

exercise of its reasonable judgment. The calculations (for Btu)

shall be based on dry gas if the gas at the measurement points

contain less than five (5) pounds of water per MMcf. If the gas at

the measurement points contains more than five (5) pounds per MMcf

of water, the appropriate factor determined by Canyon in the

exercise of its reasonable judgment for the actual water vapor

content will be applied to the Btu calculations to correct for this

water content.

 

19.5 SUPERCOMPRESSIBILITY

 

The measurement hereunder shall be corrected for

deviation from Boyle's Law at the pressures and temperatures under

which gas is measured hereunder by the use of the Formula NX-19

appearing in the manual entitled, "PAR Research Project NX-19,

Extension of Range of Supercompressibility Tables," 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 sample when

deliveries commence and thereafter by chromatographic analysis no

less than semiannually or by more frequent continuous sampling or by

continuous computer input at each of the points where the gas is

received and delivered.