Mobile Bay Pipeline Company

Second Revised Volume No. 1

Effective Date: 02/01/1994, Docket: GT94- 18-000, Status: Effective

Original Sheet No. 89 Original Sheet No. 89 : Effective

GENERAL TERMS AND CONDITIONS

(Continued)

3.5 Other Measurement Methods - When measurement is by other than

orifice, turbine, or positive meter, standards commonly

acceptable in the industry shall be used in the determination of

all factors involved in the computation of gas volumes.

3.6 Basis - Volumes delivered shall be corrected for deviation from

Boyle's Law at the pressures and temperatures under which gas is

measured by use of the NX-19 formula or table appearing in the

manual entitled "PAR Research Project NX-19, Extension of Range

of Supercompressibility Tables," AGA Catalogue No. 48/PR,

published by the AGA in 1963, with any subsequent amendments or

revisions which may be acceptable to Transporter, and shall meet

generally accepted industry standards and practices.

3.7 Determination of Heating Value - The heating value of the gas

shall be determined by a chromatograph, continuous sampler, spot

sample, or calorimeter, which method shall be selected by

Transporter, and shall meet generally accepted industry standards

and practices.

The arithmetical average of the heating value recorded during

periods of flow by a chromatograph or calorimeter shall be

considered as the heating value of the gas delivered during such

period. In the event a continuous gas sampler is used, the

heating value of the gas composite sample so taken shall be

considered as the heating value of the gas delivered during the

applicable period as determined by the Transporter. In the event

a spot sample is taken, the heating value of the spot sample so

taken shall be considered as the heating value of the gas

delivered during an applicable period as determined by

Transporter.

All heating value determinations made with a chromatograph shall

use physical gas constants for gas compounds as outlined in the

1985 edition of A.G.A. Report No. 3 (ANSI/API 2530, GPA 8185) on

"Orifice Metering of Natural Gas" with any subsequent amendments