Fire-proof Doors and Fire-proof Class

Fire-proof Doors and Fire-proof Class

The cabin door is one of the most common marine products on board. The cabin door, as its name suggests, is a marine door that prevents rain from entering and isolates wind and rain. Boat doors can be divided into three categories, as below,

1. According to the types, including watertight door, weathertight door, airtight door, fire-proof door and fasting door, etc.

2. According to the material, it is generally including steel door, aluminum door and stainless steel door.

3. According to the place of use, different types of doors are used for different compartments. For example, watertight doors are suitable for engine cabins or other important residences requiring water pressure requirements. Watertight doors need to pass the flushing pressure test or water tank test; Weathertight doors are suitable for superstructure and deckhouse entrances above the freeboard; Airtight doors are suitable for the cabin with airtight requirements, generally made of stainless steel, aluminum alloy, etc.;Hollowed doors are suitable for all types of ships and warships; Fire-proof doors are suitable for fireproof area walkways, engine room enclosures and the living cabins.

Here we mainly share the fire-proof door. The fire-proof door is fire-proof and heat-insulated,it’s made of steel plate and door frame, inlaid with refractory materials such as asbestos. When it’s installed in the bulkhead of the fire control zone, it is normally opened. When the fire temperature rises to a certain height, the door can be automatically closed. Or if the magnetic shunt is installed on the door, the door will be automatically closed after the power is cut off. The opening and closing forms of fire-proof doors are also divided into hinge type and sliding type. Some fire-proof doors also have escape exit!

According to the fire-proof class, it is divided into A-class door and B-class door. The fire-proof  class commonly includes A60, A30, A15, A0, B15 and so on. Of course, the A60 is the highest fire level.

The A-Class door is placed on the A-Class bulkhead and has equivalent fire resistance to the bulkhead, including the effectiveness of preventing smoke and flame from passing through. It also has the function as a closing device.

B-Class fire-proof doors are placed on B-Class bulkhead and has equivalent fire resistance to the bulkhead, including the effectiveness of flame penetration. B-15 and B-0 are two fire resistance grades of B-Class doors. Similar to A-Class doors, B-Class doors should fall within the scope of B-Class bulkhead fire integrity and are required for closing devices after opening in B-Class partitions.

The door set on the C-class door bulkhead is called C-class door. C-Class doors are similar in construction and composition to B-0 class doors. Since it does not require to preventing flame passing, the machining accuracy of the door, such as the gap between the door and the door frame, the door locks and chains used, etc., can be appropriately relaxed.

When selecting a fire-proof door, the principle of ‘providing fire resistance equivalent to the bulkhead in which it is located’ shall be followed, also says the same fire rating as the located bulkhead. However, there is no such requirement for the outer door of superstructure deckhouse, which does not need to meet the requirements of the fire-proof door. For example, because the bridge outside door does not require fire protection, metal sliding doors are often used to save space.