Questar Southern Trails Pipeline Company

Original Volume No. 1

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Effective Date: 10/24/2003, Docket: RP03-612-000, Status: Effective

First Revised Sheet No. 75 First Revised Sheet No. 75 : Effective

Superseding: Original Sheet No. 75

GENERAL TERMS AND CONDITIONS

 

(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.

 

(c) If an on-line gas chromatograph is used, the gross heating

value, specific gravity and components for all gas will be determined during

the applicable sampling period at that site. Gross heating values, specific

gravities and components determined from each analysis will be used in

calculating gas on a continuous basis.

 

(d) If a continuous gas sampling device is used, gross heating

value, specific gravity and components for all gas will be determined not less

than once every month at that site. Gross heating values and specific

gravities determined from spot samples will be used in calculating gas

delivered for the day on which the test is made and all following days until

the next test is made.

 

12.7 Supercompressibility. The measurement of gas will be corrected

for deviation from Boyle's Law at the pressures and temperatures under which

gas is measured by use of the calculation appearing in AGA Report No. 8 at

each of the points where the gas is received and delivered as supplemented or

amended. Inert content of the metered gas stream used in the AGA Report No.

8, Gross I, Method I, calculations will be determined by a chromatographic

analysis using spot sampling when deliveries begin and thereafter by (i) an

on-line chromatographic analysis, (ii) chromatographic analysis not less than

semiannually or (iii) analysis obtained from a composite sample.

 

12.8 Measurement. Southern Trails may install orifice, turbine,

positive displacement, ultrasonic meters or other measuring devices. They will

be installed and operated in accordance with then-approved AGA and API

recommendations, where available.

 

(a) Orifice Meters. All orifice meters will be installed and

gas volumes computed according to the standards prescribed in AGA Report No.

3, Part 2 and API Chapter 14.3.

 

(b) Turbine Meters/Positive Displacement Meters. All turbine

meters will be installed and gas volumes computed according to the standards

prescribed in AGA Report No. 7 and AGA ANSI B109.3.

 

(c) Ultrasonic Meters. All ultrasonic meters will be installed

and gas volumes computed according to the standards prescribed in AGA Report

No. 9.