Description
ASME B16.1 – Gray Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250
The ASME B16.1-2026 standard establishes requirements for Class 25, Class 125, and Class 250 cast iron pipe flanges and flanged fittings used in piping systems. It provides standardized specifications to ensure compatibility, reliability, and safe operation across a wide range of industrial and commercial applications.
This standard covers the design and application requirements for cast iron flanges and fittings, including pressure-temperature ratings, dimensions, tolerances, materials, and pressure testing. It also specifies requirements for bolting, gaskets, marking, and the designation of openings for reducing fittings, helping ensure consistency and interchangeability between components.
Key Topics Covered
- Pressure-temperature ratings for Classes 25, 125, and 250
- Sizes and methods for designating openings of reducing fittings
- Marking and identification requirements
- Material specifications for cast iron flanges and fittings
- Standard dimensions and tolerances
- Bolting and gasket requirements
- Pressure testing requirements
ASME B16.1-2026 is an essential reference for engineers, designers, manufacturers, inspectors, contractors, and piping professionals involved in the specification, fabrication, installation, and maintenance of cast iron piping systems. Compliance with this standard helps ensure safe, efficient, and standardized piping connections throughout industrial facilities, water systems, HVAC installations, and other pressure piping applications.
Product Details
Revision: 2026 Edition
Published Date: Mar 31, 2026
Status: Active, Most Current
Document Language: English
Published By: ASME
Page Count: 52
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