Flanges in Piping Systems: Types, Ratings, and Standards

Flanges are a fundamental component of any piping system. They provide the critical connection points for joining pipes, valves, pumps, and other equipment—ensuring structural integrity, pressure containment, and ease of maintenance. This course offers a complete understanding of flange types, pressure-temperature ratings, and related ASME standards, including detailed comparison between ASME B16.5 and ASME B16.47.

Designed for piping engineers, design professionals, quality inspectors, and engineering students, this course covers both the theoretical and practical aspects of flanges used in the oil & gas, petrochemical, and energy industries. Real-world examples and standard references make this course highly relevant for industry application.

Section 1: Introduction to Flanges

• What is a flange?

• Purpose and usage in piping systems

• Key terminologies related to flange connections

Section 2: Types of Flanges

• Slip-On Flange – easy installation and alignment

• Socket-Welded Flange – used in small-bore, high-pressure piping

• Screwed Flange – used where welding is not feasible

• Lap Joint Flange – used with stub ends for easy assembly/disassembly

• Weld Neck Flange – ideal for high-pressure, high-temperature applications

• Blind Flange – used to close pipe ends or nozzles

Section 3: Pressure-Temperature Rating (PT Rating)

• What is PT Rating and why is it important?

• How to interpret pressure-temperature charts

• Case study: ASTM A105 flange PT ratings at different temperatures

• Impact of temperature on flange pressure ratings

• Understanding ratings for Class 150, 300, 600, etc.

Section 4: Understanding ASME Flange Standards

• Overview of ASME B16.5 (up to 24 inches)

• Overview of ASME B16.47 (above 24 inches)

• Series A vs Series B: dimensional, mechanical, and application differences

• Use cases for each series and their design preferences

• Standard flange face types: RF, FF, RTJ