Socket-welded piping is generally not used for nominal pipe sizes above which size?

Socket-welded piping is generally not used for nominal pipe sizes above which size?

• A. 3 inches
• B. 4 inches
• C. 1 inch
• D. 2 inches

Answer: (D)

Socket-weld joints are convenient for small-bore piping because the pipe slides into a fitting socket and is welded from one side, making alignment quick. But as pipe size grows, the socket-weld becomes weaker and harder to inspect and maintain. The fillet weld around a larger socket must carry more load, and access for inspecting the root and weld becomes limited, increasing the risk of leaks or stress problems. Because of these factors, industry practice limits socket-weld connections to nominal pipe sizes up to 2 inches; for larger sizes, butt-weld joints are used to provide greater strength, better leak integrity, and more reliable inspection.

Socket-weld joints are convenient for small-bore piping because the pipe slides into a fitting socket and is welded from one side, making alignment quick. But as pipe size grows, the socket-weld becomes weaker and harder to inspect and maintain. The fillet weld around a larger socket must carry more load, and access for inspecting the root and weld becomes limited, increasing the risk of leaks or stress problems. Because of these factors, industry practice limits socket-weld connections to nominal pipe sizes up to 2 inches; for larger sizes, butt-weld joints are used to provide greater strength, better leak integrity, and more reliable inspection.