Which statement best describes the weld thickness when joining pipe to welded fittings?

Which statement best describes the weld thickness when joining pipe to welded fittings?

• A. Twice the pipe wall thickness
• B. Half the pipe wall thickness
• C. Weld thickness equals the inside diameter of the pipe
• D. Equal to the pipe wall thickness

Answer: (D)

When joining pipe to welded fittings, the weld should be sized to match the pipe wall thickness. This keeps the joint’s strength and cross-sectional area consistent with the rest of the pipe, so the joint behaves like the pipe itself under pressure. A weld that is thinner would create a weaker point at the joint, increasing the risk of leakage or failure, while a weld thicker than the pipe wall doesn’t provide a meaningful strength gain and can complicate fabrication or inspection. Therefore, using a weld thickness equal to the pipe wall thickness ensures uniform performance and reliability of the standpipe system.

When joining pipe to welded fittings, the weld should be sized to match the pipe wall thickness. This keeps the joint’s strength and cross-sectional area consistent with the rest of the pipe, so the joint behaves like the pipe itself under pressure. A weld that is thinner would create a weaker point at the joint, increasing the risk of leakage or failure, while a weld thicker than the pipe wall doesn’t provide a meaningful strength gain and can complicate fabrication or inspection. Therefore, using a weld thickness equal to the pipe wall thickness ensures uniform performance and reliability of the standpipe system.