The ASME B16.47 standard covers large diameter steel flanges in the 26 to 60 inch nominal pipe size range. This standard was developed to provide consistency in dimensions, tolerances, markings, and materials for flanges in this size range. The standard outlines specifications for Series A and Series B flanges, which have some notable differences.
Overview of ASME B16.47 Flange Series A and Series B Flanges
- Series A flanges are based on MSS SP-44 and are typically thicker, heavier, and have larger bolt holes than Series B.
- Series B flanges are based on API 605 and have more bolt holes that are smaller in diameter than Series A.
- Series A and B flanges are not compatible in terms of bolting patterns.
- Series A flanges are more commonly used for industrial connectors while Series B is often used for pipeline applications.
Key Physical Differences Between the Two Flange Types
Flange Thickness - Series A flanges are thicker while Series B uses less material.
Weight - The thicker Series A flanges are heavier than the thinner Series B versions.
Bolt Holes - Series A has larger diameter holes compared to Series B.
Number of Bolt Holes - Series B flanges generally have more bolt holes than Series A.
Pricing and Applications of Each Flange Series
Price:
The thicker, heavier Series A flanges cost more than the lighter Series B versions.
Applications:
Series A flanges are typically used for industrial connectors while Series B flanges are commonly used in pipeline projects.
Materials Used for Series A and Series B Flanges
Both flange series can be fabricated from carbon steel, stainless steel, and other alloy materials. This allows the flanges to be used in a wide range of applications and environments.
Benefits of the ASME B16.47 Flange Standard
Provides consistency in flange specifications from 26-60 inch sizes. Allows interchangeability between Series A and Series B for designers. Gives designers flexibility to choose flange style based on factors like cost and application. Covers flanges for pressures up to 2400 psi to meet high pressure application needs.
Conclusion
- The ASME B16.47 standard outlines specifications for Series A and Series B flanges in the 26-60 inch range, providing consistency across the industry.
- While the two series have some key differences, both offer options for designers in large diameter, high pressure piping applications.
- Understanding the differences in dimensions, strength, pricing, and applications allows designers to select the right series for their specific needs.
