In testing a patched hull, which test is used to verify watertight integrity without relying on a full-scale leak test?

In testing a patched hull, which test is used to verify watertight integrity without relying on a full-scale leak test?

• A. Pressure test.
• B. Visual inspection only.
• C. Magnetic particle test.
• D. Electrical continuity test.

Answer: (A)

Testing watertight integrity after patching a hull is accomplished with a pressure test. By sealing the patched area and applying a controlled pressure (air or water), you monitor for any pressure drop or visible seepage. If the pressure holds and no leaks appear at the patch, the joint is considered watertight without needing a full-scale leak test of the entire hull. This method directly checks the effectiveness of the patch seals under a differential that simulates service conditions, which is why it’s used instead of flooding the whole hull. Visual inspection alone can miss tiny leaks, magnetic particle testing is aimed at detecting surface cracks in ferrous material rather than sealing effectiveness, and electrical continuity testing checks electrical bonding, not watertight integrity.

Testing watertight integrity after patching a hull is accomplished with a pressure test. By sealing the patched area and applying a controlled pressure (air or water), you monitor for any pressure drop or visible seepage. If the pressure holds and no leaks appear at the patch, the joint is considered watertight without needing a full-scale leak test of the entire hull. This method directly checks the effectiveness of the patch seals under a differential that simulates service conditions, which is why it’s used instead of flooding the whole hull. Visual inspection alone can miss tiny leaks, magnetic particle testing is aimed at detecting surface cracks in ferrous material rather than sealing effectiveness, and electrical continuity testing checks electrical bonding, not watertight integrity.