Viking Gas Transmission Company
First Revised Volume No. 1
Contents / Previous / Next / Main Tariff Index
Effective Date: 07/01/2004, Docket: RP04-306-000, Status: Effective
Third Revised Sheet No. 45 Third Revised Sheet No. 45 : Effective
Superseding: First Revised Sheet No. 45
GENERAL TERMS AND CONDITIONS
3. MEASUREMENT AND SCHEDULING OF RECEIPTS AND DELIVERIES (Continued)
3.1. Determination of Quantity and Total Heating Value (Continued)
(b) Determination of Total Heating Value
The Total Heating Value of the gas per cubic foot shall be determined by
taking the average of the heating values determined as determined by
chromatographic analysis of a sample of gas or any other method mutually
The average (flow weighted) heating value of the gas per cubic foot
(Btu/cf) for a unit of time shall be determined by the total Dths divided
by the total Mcf quantity multiplied by 1000.
The standardized reporting basis for Btu is 14.73 dry psia and
60 degrees F (101.325 kPa and 15 degrees C, and dry). The standardized
reporting basis for gigacalorie is 1.035646 Kg/cm2 and 15.6 degrees C and
Dths shall be determined by multiplying the Mcf quantity by the ratio of
the heating value per cubic foot to 1,000.
For reporting purposes, Btu conversion factors shall be reported to not
less than 3 decimal places. For calculating purposes, not less than
6 decimal places shall be used. [2.3.10/v1.0]
(c) Determination of Gas Temperature
The temperature of the gas passing through the meters shall be determined
continuously by a recording thermometer so installed that it may properly
record the temperature of the gas flowing through the meters. Arithmetic
averages of the temperature recorded each Gas Day shall be used in
computing the measured volume of gas in Mcf.
(d) Determination of Specific Gravity
The specific gravity of the gas delivered shall be determined by the use
of chromatographic analysis or any other method mutually agreed upon.
Determination of the specific gravity and heating value per cubic foot
(Btu/cf) shall be determined at approximately the same time or from the
same analyzed gas sample.
(e) Deviation from Boyle's Law
The deviation of the natural gas from Boyle's Law shall be determined by
the use of the tables of formulae published by the American Gas
Association Par Research Project NX-19 corrected for carbon dioxide (C02)
and nitrogen (N2), or any applicable formulae published by the American
Gas Association. The molecular percentage of N2 and CO2 shall be
determined at approximately the same time or from the same analyzed gas
sample used for the determination of the compressibility factors, with
corrections for specific gravity, temperature and pressure.