Questar Pipeline Company

First Revised Volume No. 1

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Effective Date: 05/12/2003, Docket: RP03-342-003, Status: Effective

Sub. Second Revised Sheet No. 86 Sub. Second Revised Sheet No. 86 : Effective

Superseding: Second Revised Sheet No. 86

PART 1

GENERAL TERMS AND CONDITIONS

(Continued)

14.4 Atmospheric Pressure. For the purpose of measurement,

calculation and meter calibration, the average absolute atmospheric

(barometric) pressure will be based on the actual altitude at each point of

measurement irrespective of variations in natural atmospheric pressure from

time to time. When electronic computer measurement is used, the atmospheric

pressure will be the barometric pressure calculated for the elevation at the

point of measurement.

14.5 Flowing Temperature. The temperature of the gas will be

determined at the points of measurement by means of a properly installed

recording thermometer or continuous electronic transducer input to a computer

(of standard manufacture selected by Questar). When used with orifice meters,

the gas temperature device shall be installed and operated, and the gas

temperature quantities computed, in accordance with AGA Report No. 3, Part 2,

API Chapter No. 21.1, and API Chapter 14.3. When used with turbine meters,

the gas temperature device shall be installed and operated, and the gas

temperature quantities computed, in accordance with AGA Report No. 7 and API

Chapter 21.1. When used with rotary meters, the gas temperature device shall

be installed and operated, and the gas temperature quantities computed, in

accordance with AGA ANSI B109.3 and API Chapter 21.1. When used with

ultrasonic meters, the gas temperature device shall be installed and

operated, and the gas temperature quantities computed, in accordance with AGA

Report No. 9 and API Chapter No. 21.1.

14.6 Gross Heating Value and Specific Gravity.

(a) The determination of gross heating value and specific

gravity will be made from the composition by calculation using physical gas

constants for gas compounds