ANSI B16.47 Series B WN Flange is a large diameter butt welding flange that complies with the American National Standards Institute (ANSI) B16.47 standard and belongs to Series B. The following is its introduction:
Standard Specification
ANSI B16.47 standard: This standard specifically regulates large-diameter steel flanges, covering dimensions, tolerances, materials and pressure-temperature grades, and provides a unified standard for the manufacture and use of flanges in large-diameter piping systems. Series B is different from Series A in the division of large diameter ranges and is suitable for different pipe diameter ranges.
Material propertiesVarious material choices, such as carbon steel, stainless steel, alloy steel, and other materials, can be used. Carbon steel materials have low cost and good strength, and are suitable for general large-diameter piping systems; stainless steel materials have excellent corrosion resistance and are often used in situations where the medium has high corrosive requirements; alloy steel can provide better strength, and heat resistance or other special properties according to different added elements to meet different working conditions.
Structural features
Butt welding (WN) connection: This flange is connected to the pipeline by butt welding. Its neck design is conducive to reducing stress concentration at the connection between the pipeline and the flange, enhancing the reliability and strength of the connection, and ensuring the stability of large-diameter pipelines under high pressure or high temperature.
Large diameter size: Since it belongs to series B, it is aimed at larger pipe diameters. The structural design should take into account the greater pressure and torque to ensure safe operation in large-diameter pipeline systems
Application areas
Petrochemical: In large-scale devices such as petroleum refining and chemical production, it can be used to connect pipelines of large-diameter reactors, distillation towers, storage tanks and other equipment to ensure the safe transportation of media in large-diameter pipelines and withstand the pressure and temperature of various complex chemical media.
Natural gas transportation: For long-distance large-diameter natural gas transportation pipelines, this flange can provide stable connection and sealing, ensure the safe transportation of natural gas under high pressure, and prevent leakage.
Power industry: In large-diameter steam pipelines, water supply pipelines, and other systems in power production such as thermal power generation and nuclear power generation, it provides reliable structural support and sealing for the connection between pipelines to ensure efficient and stable operation of the system.
Sealing surface form
Usually, there are raised face (RF), grooved face (MFM), tongue and groove face (TG) and other sealing surface forms. The appropriate sealing surface can be selected according to different pressure, temperature and medium conditions to ensure the sealing performance of the pipeline system and prevent medium leakage.
The above is the basic situation of ANSI B16.47 Series B WN Flange, which plays a key role in connection and sealing in large-diameter pipeline systems to ensure the safety and stability of industrial processes.
What is the difference between B16 5 and B16 47?
When selecting flanges for industrial piping systems, understanding the differences between ANSI B16.5 and ANSI B16.47 Flanges is critical to ensuring safety, compliance, and performance. At Yulong, a leader in precision-engineered flange solutions, we break down the technical distinctions to help you make informed decisions.
1. Scope and Application
ANSI B16.5 Flanges: Designed for smaller pipe sizes (NPS ½” to 24”) and lower pressure classes (up to 2500 psi). Ideal for standard industrial applications like water treatment or chemical processing.
ANSI B16.47 Flanges: Cover larger diameters (NPS 26” to 60”) and higher pressure demands, commonly used in oil and gas, power plants, and heavy infrastructure.
2. Structural Design
B16.5: Features a compact, unified design with raised or flat faces.
B16.47: Split into Series A (MSS SP-44) and Series B (API 605), offering flexibility for varying bolt loads and sealing requirements. Series A suits moderate pressures, while Series B is built for extreme conditions.
3. Material and Durability
Both standards require robust materials like carbon steel or stainless steel. However, ANSI B16.47 Flanges often incorporate advanced alloys to withstand corrosive environments and thermal stress—a specialty of Yulong’s ISO-certified manufacturing process.
Why Choose Yulong for ANSI B16.47 Flanges?
Precision Engineering: Our flanges adhere strictly to ANSI/ASME specs, ensuring leak-proof performance.
Custom Solutions: Tailored dimensions, coatings, and pressure ratings for unique project needs.
Global Compliance: Certified for use in the US, EU, and APAC markets.
Pro Tip: Always verify flange ratings against operational pressures and temperatures. For large-diameter systems, ANSI B16.47 Flanges from Yulong provide unmatched reliability.
ANSI B16.47 Flanges FAQs
What are ANSI B16.47 flanges? |
| ANSI B16.47 flanges are industrial flanges built to the ANSI B16.47 standard. They are used to connect pipes and equipment in high-pressure and high-temperature applications, typically in industries such as oil & gas, petrochemicals, and power generation. |
What materials are commonly used? |
| They are primarily manufactured from carbon steel, stainless steel, or alloy steels. The choice of material depends on operating conditions like temperature, pressure, and the corrosiveness of the service environment. |
What pressure ratings are available? |
| ANSI B16.47 flanges are available in various pressure classes—often denoted as PN10, PN16, PN25, and PN40—each corresponding to specific operating pressures and temperature limits. Selecting the correct pressure rating is crucial for safe system operation. |
How do ANSI B16.47 flanges compare with other flange standards? |
| Compared to standards like DIN, JIS, or BS, ANSI B16.47 flanges differ mainly in dimensional tolerances, pressure ratings, and flange face designs. Understanding these differences is essential when designing systems that incorporate multiple international standards. |
What factors should be considered when selecting an ANSI B16.47 flange? |
| Key considerations include the operating pressure and temperature, material compatibility, flange size, and connection type. Ensuring the flange matches system requirements helps achieve a secure and leak-free connection. |
