Exam Question

(a) Hull Plating Test Locations During Drydock:
(i) Hammer Test:  The hammer test, a method of non-destructive testing, would be carried out across all areas of the hull plating. The surveyor would gently tap the plating to assess its condition, listening for sounds indicating potential damage like cracking or delamination. Particular attention would be given to areas showing signs of corrosion or previous repairs. Areas such as welds, bilge keels, and around penetrations (e.g., sea chests) would require extra scrutiny.
(ii) Hose Test:  The hose test checks the watertight integrity of the hull. This would be performed on new welds on the shell plating and other areas where watertightness is required. This is done using a nozzle with a 12.5 mm diameter and 2 bar water pressure at a distance of 1.5 m. Specific locations would include welds, sea chests, and around valve penetrations. The exact location will depend on areas of concern identified during the visual inspection.
(b) Parts of the External Plating Requiring the Closest Attention: