Welding Neck Flange Bores (B)

The inside diameter of the flange’s bore, known as the welding neck flange bore (B), is intended to coincide with the pipe’s outer diameter (OD) in order to provide a smooth and safe connection. Because welding neck flanges can create a strong, leak-proof junction and efficient stress distribution, they are frequently employed in high-pressure and high-temperature applications.

Key Aspects of Welding Neck Flange Bores:

• Accuracy: To prevent misalignment and guarantee smooth fluid flow, the bore diameter and pipe OD must match exactly.
• Standardisation: ANSI, ASME, and DIN standards, which define bore sizes for various flange classes and pipe schedules, are followed in the manufacturing of welding neck flanges.
• Customisation: To accommodate non-standard pipes or other application requirements, manufacturers can also create unique bore sizes.
• Applications: These flanges are extensively utilised in sectors where durability and high performance are essential, such as petrochemical, oil & gas, and power plants.

For piping systems to remain reliable over the long term, minimise stress, and preserve system integrity, the right bore size must be chosen.