What is the difference between weld neck flange Series A and Series B?

Are you familiar with the ASME B16.5 and ASME B16.47 standards for steel pipe flanges? If not, let's delve into these crucial standards that govern the design, dimensions, and materials of flanges used in piping systems.

For more information, please visit our website.

ASME B16.5: Covering the Basics

The ASME B16.5 standard is your go-to guide for Steel Pipe Flanges and Flanged Fittings ranging from NPS 1/2 through NPS 24, available in pressure classes 150 to . This comprehensive standard addresses everything from pressure-temperature ratings to materials, dimensions, tolerances, marking, testing, and designating openings for pipe flanges and flanged fittings.

Key Components of ASME B16.5:

• Pressure-temperature ratings
• Materials and dimensions
• Tolerances and marking
• Testing procedures

Two essential flange types, weld neck flanges, and blind flanges, find widespread use in piping systems, all within the realm of ASME B16.5.

ASME B16.47: Extending the Horizon

What about larger sizes beyond NPS 24? That's where ASME B16.47 steps in. While ASME B16.5 covers up to 24 inches, ASME B16.47 takes the baton for sizes ranging from NPS 26 through NPS 60.

Differentiating ASME B16.47 Series A and Series B:

• Series A flanges are thicker, heavier, and stronger, suitable for withstanding greater external loading.
• Series B flanges, on the other hand, are lighter, less expensive, and require more but smaller fasteners.
• Series A includes weld neck, blind, and ring type joint (RTJ) flanges, while Series B primarily focuses on weld neck and blind flanges.

Choosing the Right Flange

The choice between Series A and Series B depends on various factors, including project requirements, budget constraints, and design considerations. Generally, Series A flanges are preferred for new pipelines or critical applications, while Series B flanges are more popular for refurbishments or non-critical designs.

Conclusion: Making Informed Decisions

Understanding the nuances between ASME B16.5 and ASME B16.47 is crucial for ensuring the integrity and efficiency of piping systems. Whether you're selecting standard weld neck, slip-on, or blind flanges, knowing the standards empowers you to make informed decisions based on your specific needs.

For a detailed comparison of flange sizes and dimensions, refer to the documents provided below:

• Flange Dimensions as per ASME B16.5 standard
• Flange Dimensions as per ASME B16.47 Series A standard
• Flange Dimensions as per ASME B16.47 Series B standard

In conclusion, ASME B16.5 and ASME B16.47 standards play a vital role in the world of piping, ensuring safety, reliability, and compatibility across various industrial applications.

MIDAS supply professional and honest service.

ASME B16.5 and ASME B16.47

ASME B16.5 standard covers steel pipe flanges and flanged fittings from NPS ½&#; through NPS 24&#; in pressure classes 150 to . This includes pressure ratings, dimensions, tolerances, materials, marking, and testing.  ASME B16.5 and ANSI B16.5 only cover sizes up to 24 inches. For bigger sizes, ASME B16.47 standard covers pipe flanges in sizes 26&#; through 60&#; and in pressure class ratings 75, 150, 300, 400, 600, and 900. Then, ASME B16.47 is further divided into ASME B16.47 Series A and ASME B16.47 Series B flanges for Blinds and Weldnecks.

The designation formerly referred to as MSS SP-44 flanges are now considered ASME B16.47 Series A flanges, while API 605 flanges are now ASME B16.47 Series B flanges. Materials covered in this standard are the same as ASME B16.5 except for nickel alloys. Due to this, they share the same pressure-temperature chart for the selection of flange materials.

What is the difference between ASME B16.47 Series A and Series B flanges?

ASME B16 47 Series A flanges are thicker, heavier, and stronger than their Series B counterparts. They also can often handle more external loading than Series B. Series A flanges tend to be more costly than Series B flanges.

ASME B16.47 Series B flanges need more but smaller fasteners, such as bolts & nuts. They also usually have a smaller bolt circle diameter than Series A flanges. Generally, there is less flange movement after installation due to the smaller bolt circle diameter.

Both Series A and B define weld neck flanges and blind flanges in raised face type. However, Series A defines ring-type joint (RTJ) flanges from Class 300 through Class 900 within this standard while Series B does not.

Series A flanges are popular for new pipeline projects or equipment. Meanwhile, many choose Series B flanges for refurbishment or replacement jobs.

If you still need help deciding which is better for your project, pipeline, or job, feel free to call (281-484-) or   the Texas Flange sales office anytime from 8 a.m. to 5 p.m. Monday through Friday. Or you can drop a quick question or inquiry into our quick contact form. With our decades of expertise, we can help you get the flanges you need.

If you&#;d like to learn more about flange specifications, types, uses and more feel free to peruse our informational blog posts, free 3-D and CAD drawings, or flange charts.

The company is the world’s best Weld Neck Flange supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.