ASME B16.5-2020: Pipe Flanges and Flanged Fittings

Product Summary:
ASME B16.5-2020 defines the requirements for pipe flanges and flanged fittings in sizes NPS ½ through NPS 24, covering pressure–temperature ratings, dimensions, tolerances, materials, and testing. It applies to components used in bolted flange joints made from cast, forged, or plate materials in industrial piping systems.

Key Features:

• Pressure–temperature ratings for Classes 150 through 2500
• Dimensional standards for weld neck, blind, reducing, and other flange types
• Specifications for bolting materials, gaskets, and flange assembly practices
• Manufacturing tolerances and permanent marking requirements
• Material listings with corresponding ASTM designations for forgings, castings, and plates
• Guidance on gasket selection, bolted joint design, and system hydrotesting
• Appendices covering bolt length calculations, pressure rating derivation, and quality system standards
• Metric and U.S. Customary units presented side-by-side for reference

Who It’s For:
Essential for piping designers, mechanical engineers, fabricators, and QA/QC personnel involved in pressure piping systems across oil, gas, chemical, and industrial sectors.

ASME B16.5-2020