Nautical Term: Inner bottom

Definition of Inner bottom

The inner bottom, also referred to as the tank top, is a vital component of a ship’s hull. Located below the waterline, it forms the upper edge of the ship’s bilge keels. This area is frequently subjected to corrosion and fouling due to exposure to water and marine growth. Regular maintenance and inspection of the inner bottom are essential to ensure the continued safety and seaworthiness of a vessel.

For example, during a routine survey of a ship, the surveyor discovered that the inner bottom of the ship had not been inspected or maintained for several years. The surveyor recommended that the inner bottom be thoroughly inspected and cleaned to remove any accumulated marine growth and corrosion. The ship’s owners were advised to schedule regular inspections and maintenance of the inner bottom to ensure the continued safety and seaworthiness of their vessel.

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