SOLAS: weathertight means that in any sea conditions water will not penetrate into the ship. A weathertight item is designed to withstand water pressure from one side (the outside). Typical locations are above the waterline, for example on the deck or in the wheelhouse of the ship. Location of doors are indicated with load line position 1 or 2.

Classification societies require for watertight doors beside design approval also survey of doors and hatches. After examination of design, material, welding and pressure testing doors will be stamped with individual number which can related to a product certificate.

SOLAS: Watertight means having scantlings and arrangements capable of preventing the passage of the water in any direction under the head of water likely to occur in intact and damaged conditions. The closure between two compartments below the waterline will typically be watertight. A watertight item withstands a ‘water column’ (water pressure in mwc or bar) from both sides.

The free passage opening which a door or hatch should have, normally in mm (e.g. HxW: 2000×1000 mm). Please be aware of the standard rounded corners R=100 mm