El Paso Natural Gas Company
First Revised Volume No. 1-A
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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Original Sheet No. 203 Original Sheet No. 203 : Superseded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
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
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