ASME B16.47

ASME B16.47 – 2020 Edition – Large Diameter Steel Flanges: NPS 26 through NPS 60, Metric/Inch Standard

ASME B16.47 is a standard published by the American Society of Mechanical Engineers (ASME) titled “Large Diameter Steel Flanges: NPS 26 Through NPS 60 Metric/Inch Standard.” This standard specifically addresses large diameter steel flanges used in pipeline and pressure vessel applications. It provides guidelines for the design, materials, dimensions, tolerances, and testing of these flanges.

Here are some key aspects covered by ASME B16.47:

1. Scope: ASME B16.47 applies to large diameter steel flanges with nominal sizes ranging from NPS 26 (Nominal Pipe Size 26 inches) to NPS 60 (Nominal Pipe Size 60 inches). The standard addresses both metric and inch dimensions.
2. Flange Types: The standard covers two series of flanges: Series A (MSS SP-44) and Series B (API 605). Each series has different dimensions and specifications.
3. Pressure-Temperature Ratings: ASME B16.47 provides pressure-temperature ratings for large diameter steel flanges, helping users determine the acceptable working conditions based on the design and material specifications.
4. Materials: The standard outlines material requirements for flange components, considering factors such as pressure, temperature, and the type of service.
5. Dimensions and Tolerances: ASME B16.47 specifies the dimensions and tolerances for large diameter steel flanges, ensuring compatibility with the corresponding pipe and equipment.
6. Testing and Inspection: The standard includes procedures for testing and inspecting large diameter steel flanges to verify compliance with the specified requirements and to ensure their quality and performance.
7. Marking and Identification: ASME B16.47 provides requirements for marking and identifying flanges, allowing users to easily determine their specifications, size, and other essential information.

ASME B16.47 is important in the oil and gas, chemical, and petrochemical industries where large diameter steel flanges are commonly used in piping systems and pressure vessels. It helps promote consistency and reliability in the design and manufacturing of these critical components, contributing to the overall safety and integrity of industrial processes.

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