This course covers orifice flow meters, their operating theory, and considerations for installation,
maintenance and operation.

Course Prerequisites

• GTA Web-Based Training
  o Core WBT
  o Statistics and Uncertainty
  o Gas Properties I
  o Gas Properties II
• GTA Instructor-Led Training
  o Measurement Systems

Course Objectives

Upon completion of this course, the student will have received instruction designed to assist him/her in
the following:

• Explain why accurate orifice measurement is important.
• Describe AGA 3 (API 14.3).
• Briefly describe how orifice measurement is performed.
• Explain the gas laws used in orifice measurement.
• Explain the continuity of flow as it applies to gas flow.
• Define laminar flow and turbulent flow as they apply to gas flow.
• Describe the Reynolds Number as it applies to gas flow.
• Describe and explain the primary and secondary elements’ functions in orifice measurement.
• Describe common problems encountered with flow measurement using orifice plates.
• Describe the parameters to check when performing meter tube inspections

Course Outline

1. Importance of Gas Measurement
2. American Gas Association (AGA)-3 Overview
3. Orifice Measurement Theory
4. Measurement Components
5. Flow Measurement Pitfalls
6. Meter Tube Inspections

Recommended Resources

• GTA Orifice Meters Participant Guide
• GTA Orifice Meters Instructor Presentation.
• AGA Reports 3, 5, and 8.
• Internet sites and textbooks related to orifice meters.