What is the term for a leak that occurs around the outside of a rolled exchanger tube during a hydro test?

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The correct term for a leak that occurs around the outside of a rolled exchanger tube during a hydro test is "Roll Leak." This type of leak specifically refers to the failure at the mechanical joint where the tube is rolled into the tube sheet in heat exchangers. During hydro testing, which is conducted to check for leaks and verify the integrity of a system, any failure at this joint can lead to a noticeable leak, identified as a roll leak.

Understanding this term is crucial because it allows maintenance and engineering personnel to diagnose and address issues related specifically to how tubes are secured in heat exchangers. Recognizing roll leaks can help in taking corrective action to either repair the connection or replace affected tubes, thus ensuring the efficiency and safety of the heat exchanger.

Other terms mentioned have different implications and contexts that do not align with the specific scenario of observing leaks during hydro testing of exchanger tubes. For instance, pinhole leaks refer to smaller leaks that occur in materials and are not exclusive to the joint areas, while pipe leaks would suggest a failure along the length of a pipe, and end cap leaks pertain to issues at the caps rather than the rolling part. Hence, "Roll Leak" is the most accurate and relevant term in this context.

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