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Damage to a ship's Hull comes in many forms, and not all of it needs the same response. A shallow dent that has not cracked may need only monitoring. A crack along a weld needs attention at once. Hull damage repair in Nagoya begins with understanding exactly what we are dealing with.
The main types are dents, scrapes and gouges, cracks, holes and corrosion damage. Dents are caused by contact, such as a hard berthing or a strike with a floating object. Cracks may start from a weld or from stress in the structure. Holes may follow a collision or grounding. Corrosion damage is slower and may only be found at inspection.
An inspection dive records each defect. The Diver measures the size, the depth of any dent and the length and direction of any crack. Thickness Measurement around the area shows whether the plate is thinning. All this goes into a short report for the surveyor and the owner. Without this step, repair decisions rest on guesswork.
If the dent is shallow and the paint is the only thing damaged, the area may only need cleaning and recoating at the next docking. Deeper dents may need to be monitored for cracks. Some can be flattened or reinforced with a doubler. The surveyor decides based on the depth, the location and the plate thickness.
A crack is a warning sign. Depending on the length and position, it may be stopped by drilling a small hole at each end to stop it spreading, then welded or patched. A crack near a tank boundary or in a stressed area will likely need a more serious repair. We report all cracks promptly.
Holes need immediate attention. A temporary patch stops the water, and a doubler or insert plate follows. The size of the hole and the condition of the plate around it determine the best approach. We work with the surveyor to find a solution that is safe and acceptable.
Every repair has a paper trail. We provide video, photographs, measurements, the repair plan and a record of the work done. These may be needed by the class society, the flag state, the P&I club and underwriters. A clear report helps the claim and the survey go smoothly.
Send us the ship's details, the incident description and any available photographs. We arrange an inspection dive, produce a written assessment and propose a repair plan.
Where corrosion has thinned the plate over a wide area, repair afloat may only be a temporary step. The Diver takes many readings to map the area, and the surveyor may require renewal of the plate at the next dock. We provide the thickness map in a clear table, so it can be used by the shipyard and by the class office. Early detection through regular inspection helps avoid rushed repairs.
Dents and small repairs are quick. Cracks and holes take longer. We give a written estimate after the assessment dive, and the estimate states what is included and what may change if the damage turns out larger than it appears.
Q1. What are the main types of hull damage?
Dents, scrapes and gouges, cracks, holes and corrosion damage.
Q2. How is a crack stopped from spreading?
Often by drilling a small hole at each end of the crack, then welding or patching it. Cracks near tank boundaries or in stressed areas need a more serious repair.
Q3. What measurements are taken for a dent?
The depth and length of the dent and the plate thickness around it, taken with an ultrasonic gauge.
Q4. Who needs the repair records?
Potentially the class society, the flag state, the P&I club and underwriters. A clear report helps the survey and any claim.
