El Paso Natural Gas Company

Second Revised Volume No. 1A

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Effective Date: 11/01/2007, Docket: RP07-708-000, Status: Effective

Second Revised Sheet No. 203 Second Revised Sheet No. 203

Superseding: Substitute First Revised Sheet No. 203







2.1 Unit of Measurement and Metering Base. The volumetric measurement

base shall be 1 cubic foot of gas at a pressure base of 14.73

pounds per square inch absolute, at a temperature base of 60

degrees Fahrenheit, and without adjustment for water vapor.


2.2 Atmospheric Pressure. For the purpose of measurement, calculation

and meter calibration, the average absolute atmospheric

(barometric) pressure shall be based on the actual altitude of each

point of measurement irrespective of variations in natural

atmospheric pressure from time to time.


2.3 Temperature. The temperature of the gas shall be determined at the

points of measurement by means of acceptable measurement equipment

of standard manufacture as determined by Transporter in exercise of

its reasonable judgment, which shall be installed in accordance

with the recommendations contained in ANSI/API 2530 First Edition

(Orifice Metering of Natural Gas). The arithmetic average of

Hourly temperatures for each Day shall be used in computing

temperatures of the gas during such Day. In the event electronic

computer measurement is used, average hourly temperature will be

computed as a running average of data determined during each

computer scan.


2.4 Determination of Heating Value and Specific Gravity. The gross

Heating Value and specific gravity of the gas may be determined by

gas chromatographic analysis. This shall be done by either a gas

sample or by an on-line gas chromatograph. In the event a

continuous gas sampling device is used, the analysis shall be

performed monthly. The determination of gross Heating Value and

specific gravity from an on-line chromatograph shall input

continuously into the computer for quantity calculations. In the

event a continuous gas sampler is installed, then the gross Heating

Value and specific gravity shall be determined in the laboratory by

chromatograph. Such determinations shall be considered as the gross

Heating Value and specific gravity of all gas delivered during the

applicable period of sampling. All gross Heating Value and specific

gravity determinations made with a chromatograph shall use physical

gas constants for gas compounds as outlined in ANSI/API 2530 with

any subsequent amendments or revisions to which the Parties may

mutually agree.