Overthrust Pipeline Company

First Revised Volume No. 1-A

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Effective Date: 11/01/1997, Docket: RP97-131-005, Status: Effective

Second Revised Sheet No. 61 Second Revised Sheet No. 61 : Superseded

Superseding: First Revised Sheet No. 61

value based on cubic meters, the reporting standard is

megajoules/cubic meter at standard conditions of 101.325

kPa, 15 degrees C, and dry. (For reference, one megajoule

equals one million joules.) Overthrust will standardize the

reporting basis for gas volumes as cubic foot at standard

conditions of 14.73 psia, and 60 degrees F. For gas volumes

reported in cubic meters, the standard conditions are

101.325 kPa and 15 degrees C.


13.2 Atmospheric Pressure. For the purpose of

measurement, calculation and meter calibration, the average

absolute atmospheric (barometric) pressure shall 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.


13.3 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 and installed according

to the recommendations contained in ANSI/API 2530 (Orifice

Metering of Natural Gas). The arithmetic average of

temperatures for each day shall be used in computing

temperatures of the gas during such day for conventional

chart measurement. When electronic computer measurement is

used, average daily temperature will be computed as a

running average.


13.4 Determination of Gross Heating Value and

Specific Gravity. Since Overthrust has installed electronic

computer measurement equipment and field chromatographs, the

determination of gross heating value and specific gravity

shall be made from the composition by calculation using

physical gas constants for gas compounds as outlined in GPA

Standard 2145 92 and GPA Standard 2172-86 (Table of Physical

Constants of Paraffin Hydrocarbons and Other Components of

Natural Gas) with any subsequent amendments or revisions

that Overthrust may adopt.


If Overthrust elects to install conventional chart

measurement, the arithmetic average of the hourly heating

value and specific gravity recorded during periods of flow

each day by a recording calorimeter and gravitometer or

recording chromatograph, if installed, will be the gross