Hydrocarbon Measurement Standards
For purposes of accurately measuring natural gas and other related hydrocarbon fluids in the U.S. via orifice measurement, most contracts reference the American Gas Association (AGA) Report No. 3, Parts 1-4. The standard from which this was derived, Report No. 1, was first issued in 1930 and continues to be updated as more advanced equations and equipment specifications are developed, approved, and introduced to industry. The following is a general description and use for Parts 1-4:
- Part No. 1 — General Equations and Uncertainty Guidelines: This section is useful for determiningthe expected measurement accuracy if everything is working properly and for estimating the amount of error when there is a problem.
- Part No. 2 — Specification and Installation Requirements: This section is used in the proper design, installation, and operation of measurement stations.
- Part No. 3 — Natural Gas Applications: This section contains the actual equations used to calculate the flow of natural gas through the meter.
- Part No. 4 — Background, Development, Implementation Procedure, and Subroutine Documentationfor Empirical Flange-Tapped Discharge Coefficient Equation: This section covers the history of tests performed to develop the standard and sample computer code to perform the calculationscovered in Part No. 3 including programming guidelines.
While AGA Committee Report No. 3, Parts 1-4, provides the standards for producing accurate and accountable measurement results, these standards do not provide measurement policy or standard operating procedures (SOPs), all of which are necessary components of a functional, cost-effective measurement operation.
"Hold yourself responsible for a higher standard than anybody else expects of you." ~ Henry Ward Beecher