Rockies Express Pipeline LLC (Entrega)

Second Revised Volume No. 1

Effective Date: 09/01/2007, Docket: CP06-354-002, Status: Effective

Original Sheet No. 227 Original Sheet No. 227 : Effective

GENERAL TERMS AND CONDITIONS

18. MEASUREMENT

18.1 MEASUREMENT STANDARDS

All meters (including Ultrasonic, orifice, turbine, rotary and

diaphragm type) shall be installed in accordance with the

following standards, where applicable:

A. Measurement of Gas by Multipath Ultrasonic Meters - AGA 9

B. Orifice Metering of Natural Gas - Specifications and

Installation Requirements - AGA 3; Part 2

C. Orifice Metering of Natural Gas - Natural Gas Applications -

AGA 3; Part 3

D. Measurement of Gas by Turbine Meters - AGA 7

E. Compressibility and Super compressibility for Natural Gas

and other Hydrocarbon Gases - AGA 8

F. Table of Physical Constants of Paraffin Hydrocarbons and

other Components of Natural Gas - GPA 2145

G. Flow Measurement Using Electronic Metering Systems - Section

1 Electronic Gas Measurement - API 21.1

18.2 UNIT OF MEASUREMENT AND METERING BASE

The volumetric measurement base shall be one (1) cubic foot of Gas

at a pressure base of fourteen and seventy-three hundredths pounds

per square inch absolute (14.73 psia), at a temperature base of

sixty degrees Fahrenheit (60 F.), and without adjustment for water

vapor except as described in Section 18.5.

18.3 ATMOSPHERIC PRESSURE

For the purpose of measurement, calculations, and meter

calibration, the average absolute atmospheric (barometric)

pressure shall be based on the actual altitude of each Point of

measurement irrespective of variations in natural atmospheric

pressure from time-to-time. In the event electronic computer

measurement is used, the absolute Gas pressure may be measured

directly, using an absolute pressure measuring device or a gage

pressure corrected to absolute for continuous input to the

electronic computer.