What type of pipe rupture has no protruding edges and is located on a curved section of a pipe?

• A. Elbow
• B. Tee
• C. Coupling
• D. Stub Out

Answer: (A)

Ruptures form where stress concentrates, and the geometry of the pipe dictates how cracks appear. A bend or curved section tends to crack along its curved surface rather than at a joint. An elbow is exactly that curved section that redirects flow, so a rupture on it would be on the curved surface with no protruding edges.

In contrast, a Tee or a coupling involves joints and connections, which typically show edges or welds at the junctions, and a stub out is a short piece extending from a wall with an exposed end. Those shapes would more likely produce ruptures associated with the joint or the end rather than a smooth curved area.

So, the rupture described—no protruding edges on a curved section of pipe—fits an elbow.