El Paso Natural Gas Company

First Revised Volume No. 1-A

Effective Date: 05/01/1990, Docket: GT90- 26-000, Status: Effective

Original Sheet No. 203 Original Sheet No. 203 : Superseded

TRANSPORTATION GENERAL TERMS AND CONDITIONS

(Continued)

2. METHOD OF MEASUREMENT

2.l Unit of Measurement - The unit of measurement for the purpose

of receipt and delivery of natural gas for transportation

shall be one (1) dth. The number of dth's delivered shall be

determined by multiplying the number of Mcf of gas delivered

by the total heating value of such gas in Btu's per cubic

foot, and multiplying the product by 0.001.

The unit of volume for the purpose of measurement shall be one

(1) Mcf at a pressure of fourteen and seventy-three hundredths

pounds per square inch absolute (14.73 psia) and at a

temperature of sixty degrees Fahrenheit (60~F). All readings

and registrations of the metering equipment shall be computed

into such unit of volume.

2.2 Basis - All orifice meter volumes shall be computed in

accordance with applicable American Gas Association reports.

Where measurement is by other than orifice meters, all

necessary factors for proper volume determination shall be

applied.

All orifice meter volumes shall be corrected for deviations

from the ideal gas laws (supercompressibility) in accordance

with the applicable American Gas Association reports. Where

displacement meters are used, the square of the orifice meter

supercompressibility factor shall be applied.

For the purpose of measurement, the atmospheric pressure shall

be the barometric pressure calculated for the elevation at the

point of measurement.

2.3 Determination of Heating Value - The heating value of gas

shall be determined from time to time by analysis of samples

obtained from continuous sampling devices. The samples shall

be run on a recording calorimeter, employing the Thomas

principle of calorimetry, located at the measuring station or

at any other point on the pipeline where there will be no

commingling thereafter of gas, or by means of some other

recognized method. The arithmetic average heating value of

the gas during the chart period shall be used in computing any

deficiency in Btu content of gas delivered during such

period.