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. 79 Original Sheet No. 79 : Effective
GENERAL TERMS AND CONDITIONS
(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.
13.7 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.
13.8 Measurement. Overthrust 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.