High Island Offshore System, L.L.C.

Third Revised Volume No. 1

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Effective Date: 04/07/1999, Docket: GT99- 17-000, Status: Effective

Original Sheet No. 81 Original Sheet No. 81 : Effective







3.7(a) Turbine Meters. Turbine meters, shall be installed,

and Gas volumes computed, in accordance with

Transmission Measurement Committee Report No. 7 of the

American Gas Association, latest edition. Calibration

of turbine meters shall be at or near normal operating

pressure, against standards adopted by HIOS. The

measured volumes of gas shall be adjusted to reflect

the deviation of Gas Volumes from the ideal gas law.


The average pressure, temperature, specific gravity,

and carbon dioxide and nitrogen content for the period

under consideration shall be determined so as to

calculate a factor for volumetric adjustment known as

the supercompressibility factor, and its application

to volume calculations to effect volumetric adjustment,

shall be in accordance with in Transmission Measurement

Committee Reports No. 7, Turbine Metering, or such

subsequent industry standard that may be developed and

adopted by HIOS.


3.7(b) Orifice Meters. Orifice meters, if used, shall be

installed and gas volumes computed, in accordance with

the American Gas Association Report No. 3, latest



3.7(c) Electronic Flow Computers. It is recognized that

electronic flow computers will be utilized for the

direct computation of Gas flows without the use of



3.7(d) Densitometers. If a densitometer is used, the density

of the Gas shall be determined to the nearest .001 of

a pound. Calibration shall be done as directed by



3.7(e) New Measurement Techniques. If at any time during the

term hereof, a new method or technique is developed

with respect to Gas measurement or the determination

of the factors used in such Gas measurement, such new

method or technique may be substituted upon mutual

agreement thereto by the parties.