Questar Overthrust Pipeline Company

Second Revised Volume No. 1-A

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Effective Date: 04/25/2007, Docket: RP07-360-000, Status: Effective

Original Sheet No. 78 Original Sheet No. 78 : Effective

 

GENERAL TERMS AND CONDITIONS

 

13.3 Unit of Measurement and Metering Base. The standard reporting

basis for Btu is 14.73 psia and 60 degrees F (101.325 kPa, and 15 degrees C,

and dry). The standard reporting basis for gigacalorie is 1.035646 Kg/cm2 and

15.6 degrees C and dry. The standard reporting basis for gas volumes is

cubic foot at standard conditions of 14.73 psia, and 60 degrees F, and dry.

For gas volumes reported in cubic meters, the standard conditions are 101.325

kPa and 15 degrees C, and dry (NAESB 2.3.9).

 

13.4 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 gas pressure will be measured

directly, using a pressure measuring device for continuous input to the

electronic computer.

 

13.5 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 Overthrust). 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.

 

13.6 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 as outlined in GPA Standard 2145-03 and GPA

Standard 2172-96, with any subsequent amendments or revisions that Overthrust

may adopt.

 

(b) Installation, maintenance, and operation of on-line

chromatographs or laboratory chromatographs, including sample delivery

systems, and composite sample systems, will conform with API Chapter 14.1, and

GPA Standard 2261-00 with any subsequent amendments or revisions.