Gulf States Transmission Corporation

Original Volume No. 1

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Effective Date: 08/01/2009, Docket: RP09-795-000, Status: Effective

First Revised Sheet No. 41 First Revised Sheet No. 41

Superseding: Original Sheet No. 41

GENERAL TERMS AND CONDITIONS

(Continued)

4. MEASUREMENTS

(a) Transportation Unit

The Transportation Unit of the natural gas deliverable shall be an MMBtu of natural gas on the measurement basis as hereinafter set forth.

(b) Quantity and Heat Value

The quantity and the Heating Value of the natural gas delivered shall be determined as follows:

(i) The unit of volume for the purpose of measurement shall

be one (1) cubic foot of natural gas at a temperature of 60ø Fahrenheit and an absolute pressure of 14.73 pounds per square inch.

(ii) The average absolute atmospheric pressure shall be assumed to be 14.73 pounds per square inch.

(iii) The temperature of the natural gas flowing through the

meters, necessary for computing natural gas quantities, shall be determined by electronic flow measurement equipment so installed that it may properly monitor the temperature of the natural gas flowing through the meters or other such measu

(iv) The specific gravity of the natural gas flowing through

The meters, when necessary for computing natural gas quantities, shall be, unless otherwise agreed upon, determined by the use of an indicating gravitometer or from a representative sample obtained from a continuous sampling device and anal

(v) The deviation of the natural gas from Ideal Gas Laws

shall be calculated by methods recommended in the A.P.I. Publication Number 2530, which Is titled "Orifice Metering of Natural Gas," as amended from time to time, including the A.G.A. Publication "Manual for Determination of Supercompressib

(vi) The Heating Value shall be determined by either (1) the

use of a suitably located and acceptable make calorimeter or (2) calculation from a fractional analysis, or (3) methods outlined In A.G.A.