ASME B16.5

ASME B16.5 – 2020 Edition – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24, Metric/Inch Standard

ASME B16.5 is a standard published by the American Society of Mechanical Engineers (ASME) that specifies the design, dimensions, manufacturing, and testing requirements for flanges and flanged fittings. The full title of the standard is “Flanges and Flanged Fittings: Steel Flanges, NPS 1/2 through NPS 24, Metric/Inch Standard.”

Key aspects of ASME B16.5 include:

Scope: The standard applies to flanges and flanged fittings, where the flanges are made of materials such as carbon steel, alloy steel, stainless steel, nickel alloy, and others.

Size Range: ASME B16.5 covers dimensions from NPS 1/2 (Nominal Pipe Size) to NPS 24. It provides both metric and inch size systems.

Pressure Ratings: The standard defines a series of pressure classes to meet the requirements of different engineering applications. These pressure classes specify the pressure resistance of the flanges and flanged fittings.

Design Requirements: ASME B16.5 includes design requirements for flanges, covering types of flanges, arrangement of bolt holes, and the design of sealing faces.

Manufacturing Requirements: The standard outlines the manufacturing requirements for flanges and flanged fittings to ensure compliance with performance and quality standards.

Testing and Inspection: Detailed procedures for testing and inspecting flanges and flanged fittings are described to ensure compliance with performance and quality standards.

Marking and Labeling: ASME B16.5 specifies the required markings and labels on flanges to facilitate traceability and verification.

Appendices: The standard may include appendices containing additional information, such as specifics for special cases or calculation examples.

ASME B16.5 aims to provide a standardized approach to the design and manufacturing of flanges and flanged fittings, ensuring their safety, reliability, and interchangeability in various engineering applications. The standard is commonly used in pipeline systems, pressure vessels, and other engineering projects.

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