National Fuel Gas Supply Corporation

Fourth Revised Volume No. 1

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Effective Date: 08/01/1997, Docket: RP97-398-000, Status: Effective

Original Sheet No. 338 Original Sheet No. 338 : Effective





3. MEASUREMENT (Cont'd.)


3.5 Specific Gravity


The specific gravity of the gas shall be determined once a month

or as frequently as necessary for reasonably accurate

determination by means of suitable apparatus. Such specific

gravity so obtained shall be used for the purpose of measurement

of gas.


3.6 Volumetric Measurement Computations


The deviation of the gas from Ideal Gas Laws shall be calculated

following the recommendations of the ANSI/API 2530 "Orifice

Metering of Natural Gas and Other Related Hydrocarbon Fluids"

(A.G.A. Report No. 3) including the A.G.A. Manual for

Determination of Supercompressibility Factors of Natural Gas or

the A.G.A.


Transmission Measurement Committee Report No. 8 "Compressibility

and Supercompressibility for Natural Gas and Other Hydrocarbon

Gases." If the composition of the gas is such as to render the

above procedure inapplicable, other methods for determination of

the deviation factors, mutually agreed upon by Shipper and

Transporter, shall be used.


3.7 Total Heating Value


The total heating value of the gas per cubic foot shall be

determined for any month by taking the average of the heating

values as recorded each day by a calorimeter or chromatograph or

as determined by chromatographic analysis of a sample of gas, or

methods outlined in AGA Gas Measurement Report No. 5, or any

other method mutually agreed upon by Transporter and Operator.