What should be done with holes in piping for outlets prior to welding?

What should be done with holes in piping for outlets prior to welding?

• A. They should be left as drilled.
• B. They should be cut to the full inside diameter of the fittings.
• C. They should be cut to the full outside diameter of the fittings.
• D. They should be patched with a cap.

Answer: (B)

Sizing holes for outlets to match the inside diameter of the fittings is essential because it creates a clean, continuous inner bore and provides proper weld surface around the outlet. Cutting the hole to the inner bore allows the outlet to fit flush with the pipe, ensures the wall thickness around the joint remains correct, and enables a full-penetration weld for a leak-free connection. Leaving the hole as drilled would risk an undersized opening that interferes with installation and flow; cutting to the outside diameter would overremove material and weaken the joint; patching with a cap would eliminate the outlet altogether.

Sizing holes for outlets to match the inside diameter of the fittings is essential because it creates a clean, continuous inner bore and provides proper weld surface around the outlet. Cutting the hole to the inner bore allows the outlet to fit flush with the pipe, ensures the wall thickness around the joint remains correct, and enables a full-penetration weld for a leak-free connection. Leaving the hole as drilled would risk an undersized opening that interferes with installation and flow; cutting to the outside diameter would overremove material and weaken the joint; patching with a cap would eliminate the outlet altogether.