Western Gas Interstate Company

Third Revised Volume No. 1

Effective Date: 06/01/1993, Docket: RS92- 53-003, Status: Effective

Revised Original Sheet No. 255 Revised Original Sheet No. 255 : Superseded

GENERAL TERMS AND CONDITIONS

(continued)

(b) The average absolute atmospheric pressure shall be

assumed to be thirteen (13.0) pounds to the square

inch, irrespective of actual elevation or location of

the Delivery Point or Receipt Point above sea level or

variations in such atmospheric pressure from time to

time.

necessary for computing gas quantities, shall be

determined for any day by the continuous use of a

recording thermometer so installed that it may

properly record the temperature of the gas flowing

through the meters.

The arithmetic average of the temperature recorded

each day shall be used in computing gas quantity, or

instantaneous temperature measurements may be applied

to metering instruments for quantity computation, or

an assumed temperature of 60 degrees Fahrenheit may be

used.

(d) The specific gravity of the gas delivered shall, be

determined by the use of spot tests with an instrument

of standard manufacture acceptable in the industry.

The specific gravity of the gas delivered shall be

determined with such reasonable frequency as is found

expedient in practice but not less frequently than

once each six months.

(e) The deviation of the gas from Ideal Gas Laws shall be

calculated according to the recommendations of the

American Gas Association in the Measurement Committee

Report, No. 3 entitled "Orifice Metering of Natural

Gas, April 1955," as may be amended or modified from

time to time, or any other method or methods mutually

agreed upon.