What are the fire resistance ratings for fire dampers?
According to the requirements of the 1974 Convention for the Safety of Life at Sea (SOLAS) and the 1981 and 1983 amendments, the fire protection level and form of the ship's structure are stipulated, and different types of ships and parts of the ship are divided into three levels of fire resistance: A, B and C. Level A is divided into four levels.
Overview
Introduction:
Class A Fire Rating: It is a non-combustible material, which can effectively resist the spread of fire and can be applied in key locations of the ship. For example, the main deck, command bridge, engine room and other places.
Type:
Class A compartmentalized construction shall be protected from the passage of smoke and flame until the end of the one-hour standard fire resistance test. It shall be insulated with noncombustible materials so that the temperature on the backfire side does not increase by more than 139 degrees from the original temperature and does not exceed 180 degrees from the original temperature at any point, including any joints, for the following periods of time.
Grade A-60 60 minutes
Grade A-30 30 minutes
A-15 15 minutes
A-0 0 minutes
