ASME B 16.47 Series A
ASME B 16.47 Series A
ASME B16.47 Series A refers to a standard published by the American Society of Mechanical Engineers (ASME) that specifies the dimensions, materials, pressure ratings, and other requirements for large-diameter steel flanges. These flanges are commonly used in industries such as oil and gas, petrochemical, power generation, and pipeline systems.
Materials
Flanges according to ASME B 16.47 Series A and MSS SP44 are typically made from carbon steel and alloy steel to withstand varying pressure and temperature conditions. Common materials include:
- Carbon Steel (e.g., ASTM A105, A350 LF2)
- Low-Alloy Steel (e.g., ASTM A234 WPB, ASTM A694 F42, F52)
- Stainless Steel (e.g., ASTM A182)
- Alloy Steel (e.g., ASTM A182 F9, F11)
ASME B 16.47 Series A Dimensions
ASME B 16.47 Series A 150 Flanges Dimensions
ASME B 16.47 Series A 300 Flanges Dimensions
ASME B 16.47 Series A 400 Flanges Dimensions
ASME B16.47 Series A 600 Slip On Flange Dimensions
ASME B16.47 Series A 900 Slip On Flange Dimensions
Pressure-Temperature Ratings
The pressure-temperature rating for flanges is defined by the specific material used. These ratings indicate the maximum pressure and temperature the flange can safely handle without failure. Flanges are classified into pressure classes (e.g., 150, 300, 600, etc.) with corresponding temperature ratings.
- Pressure ratings vary based on the flange material, flange size, and temperature.
- Flanges are designed to handle high-pressure environments and can withstand high-temperature variations depending on the material selection.
Flange Types
There are different types of flanges that fall under these standards, including:
- Weld Neck Flange: Used in high-pressure systems, the flange neck is welded to the pipe, providing additional strength.
- Slip-On Flange: This type is easier to install and is often used in low- to medium-pressure applications.
- Blind Flange: Used to close off the end of a pipe, it is designed to seal the pipe opening.
- Socket Weld Flange: Designed for small diameter piping, this flange allows for a tight seal and is suitable for high-pressure systems.
- Lap Joint Flange: Primarily used in systems where easy disassembly is needed, such as for maintenance.
Connection Types
The connections for flanges typically involve bolted connections or welding. The connection type varies based on the application and the flange style:
- Butt Weld: Flanges are welded directly to the pipe.
- Bolted Connection: Flanges are secured together with bolts and gaskets.
- Socket Weld: A socket is welded to the pipe to secure the flange.
Coating and Surface Treatment
To enhance the durability and resistance to corrosion, flanges are often coated or treated. Common surface treatments include:
- Hot Dip Galvanizing: Provides a coating of zinc to resist corrosion.
- Coatings for High-Temperature Service: Flanges used in high-temperature environments may have coatings that protect against oxidation and wear.
- Passivation: A treatment for stainless steel flanges to increase corrosion resistance.
Flange surfaces may also be finished to meet specific requirements for pressure sealing, such as:
- Smooth Surface Finish: Ensures a tight seal with gaskets.
- Rougher Finish: Provides better gripping for gaskets in high-pressure systems.
ASME B 16.47 Series A Welding Neck Flange
