In the realm of industrial piping, flanges play a crucial role in ensuring secure connections between pipes, valves, pumps, and other equipment. Among the standards governing these components, ANSI B16.47 Flanges stand out for its specifications on large-diameter steel flanges.
There are two distinct series to this standard:Series A and Series B.
While both serve to connect high-capacity piping systems, they differ in several key aspects. This article delves into the differences between ASME B16.47 Series A and B flanges, covering bolt hole diameter, bolt hole spacing, shim type, and applications.
Bolt Hole Diameter
Series A: The smaller bolt hole diameter of Series B flanges is one of the primary distinctions between Series A and Series B flanges.
Series A flanges are designed with smaller bolt hole diameters compared to Series B. This difference is intentional and reflects the specific design criteria and application requirements for each series.
The smaller bolt hole diameter in Series A flanges is aimed at optimizing the flange’s strength and pressure-handling capability. By minimizing the bolt hole size, the integrity of the flange is maintained, ensuring it can withstand higher pressures and provide a secure seal in demanding environments. This characteristic makes Series A flanges particularly suitable for high-pressure applications where maintaining the flange’s structural integrity is paramount.
In contrast, Series B flanges feature larger bolt hole diameters, which allow for the use of more substantial bolts. This design is beneficial in applications where the ANSI B16.47 Flanges needs to accommodate larger bolts for secure connections, typically in settings where pressure requirements are lower but robust and durable connections are still necessary.
Bolt Hole Spacing
Series B: The separation between bolt holes is also significantly different between Series A and Series B flanges. This is one more significant distinction.
Series B flanges have larger spacing between their bolt holes compared to Series A flanges. This design feature influences the overall installation and maintenance aspects of the flanges.
The larger bolt hole spacing in Series B flanges provides several practical advantages. It makes it easier to put in and take out bolts, which can be especially useful in applications that need to be maintained frequently.
Furthermore, the expanded dispersing can assist with appropriating the heap all the more equally across the flange, decreasing the weight on individual bolts and improving the general security of the association.
On the other hand, Series A flanges, with their closer bolt hole spacing, are designed to create a more compact and robust connection. In high-pressure and high-temperature applications where minimizing potential points of failure is crucial, this design is advantageous. The closer spacing ensures that the flange can effectively withstand the intense operational conditions, providing a secure and reliable connection.
Shim Type
①Series A: Use Ring Joint Gasket (RTJ)
The type of shim or gasket used in flange connections is a crucial factor in ensuring a leak-proof seal. For Series A flanges, the preferred gasket type is the Ring Joint Gasket (RTJ). RTJs are metallic gaskets that provide a high-integrity, metal-to-metal seal. ANSI B16.47 Flanges are typically used in applications where high pressure and temperature conditions are present.
The use of RTJs in Series A flanges aligns with their design for high-stress environments. RTJ gaskets are ideal for critical applications like boilers and heat exchangers due to their metallic nature, which enables them to maintain a dependable seal even under extreme conditions.
The RTJ gaskets are also resistant to corrosion and can withstand significant mechanical stresses, further enhancing the durability and reliability of Series A flange connections.
②Series B: Full Face Gaskets (FF) or Ring Joint Gaskets (RTJ) Can Be Used
In contrast, Series B flanges offer greater flexibility in gasket selection. Both Full Face Gaskets (FF) and Ring Joint Gaskets (RTJ) can be used with Series B flanges, depending on the specific requirements of the application.
Full Face Gaskets typically cover the entire flange and are typically made of non-metallic materials like rubber or composite materials. They provide a broader sealing surface, which can be advantageous in applications with lower pressure and temperature requirements. The use of FF gaskets in Series B flanges allows for a versatile and cost-effective sealing solution in various industrial settings.
The option to use RTJ gaskets with Series B flanges adds to their versatility. In applications where higher pressure and temperature conditions are present, RTJ gaskets can be employed to ensure a secure and reliable seal. This dual compatibility makes Series B flanges suitable for a wide range of applications, offering flexibility in both gasket material and design to meet specific operational needs.
Application
Series A: Typically Used for High-Pressure and High-Temperature Applications, Such as Boilers and Heat Exchangers
The applications of ANSI B16.47 Flanges are influenced by their design characteristics and performance capabilities. Series A flanges are typically used in high-pressure and high-temperature applications, where their robust design and smaller bolt hole diameter provide significant advantages.
Boilers, heat exchangers, and other critical equipment in the oil and gas, petrochemical, and power generation industries are all common uses for Series A flanges. The ability of Series A flanges to withstand extreme conditions makes them ideal for these demanding environments, where maintaining a secure and leak-proof connection is essential for safety and efficiency.
Series B: Typically Used for Applications That Require Larger Bolt Hole Spacing and the Use of Full Face Gaskets, Such as Valves and Pipe Fittings
Series B flanges, with their larger bolt hole spacing and flexible gasket options, are typically used in applications that require robust but less critical connections. These flanges are often employed in the construction of valves, pipe fittings, and other components where the operational conditions are less severe compared to those encountered by Series A flanges.
The ability to use Full Face Gaskets with Series B flanges makes them suitable for applications in water treatment, chemical processing, and general industrial settings. The larger bolt hole spacing also facilitates easier maintenance and installation, making Series B flanges a practical choice for applications where accessibility and ease of handling are important considerations.
ANSI Flanges Manufacturers
When it comes to sourcing high-quality ANSI B16.47 Flanges, it is essential to choose a reputable manufacturer with a proven track record of delivering reliable and durable products. One such manufacturer is HeBei Pengrun Pipe Fittings Co., Ltd. They specialize in the supply of this kind of flanges, offering a wide range of options to meet the diverse needs of various industries.
HeBei Pengrun Pipe Fittings Co., Ltd. is known for its commitment to quality and customer satisfaction. To guarantee that they fulfill the most noteworthy standards of execution and trustworthiness, our products go through severe testing and quality control procedures.
If you are in need of the flanges, do not hesitate to reach out to HeBei Pengrun Pipe Fittings Co., Ltd. at Lucy@pr-pipefittings.com for more information and assistance.
References
1. ASME B16.47 Standard for Large Diameter Steel Flanges
2. “Differences Between ASME B16.47 Series A and B Flanges” – Piping Designer
3. “Understanding Flanges: ASME B16.47 Series A vs. Series B” – Engineers Edge
4. “Flange Types and Characteristics” – The Engineering Toolbox
5. “Gasket Selection for Flanges” – Swagelok
