Introduction
Flanges are critical components in industrial piping systems, providing leak-proof connections that must withstand pressure, temperature, and corrosive environments. For procurement engineers, selecting the right flange involves understanding standards, material specifications, and quality assurance. This guide outlines the key factors to consider when procuring flanges for your next project.
Standards to Confirm
Flanges must comply with international or industry-specific standards. The most common are:
- ASME B16.5: For flanges and flanged fittings up to NPS 24 (DN 600).
- ASME B16.47: For large-diameter flanges (NPS 26 to 60).
- EN 1092-1: European standard for flanges.
- JIS B2220: Japanese standard for steel pipe flanges.
Always verify which standard your project requires, including pressure class (e.g., 150, 300, 600) and facing type (e.g., raised face, flat face, ring joint).
