Deficient fire dampers are a leading cause of detention. The purpose of a fire damper is to be able to stop the flow of air into a space to help stop a fire in an emergency. Correct operation of the dampers can usually be checked without needing to open the casing because of the sound that can be heard.
Common fire damper issues include:
- holes caused by corrosion and rust
- not closing at all or completely
- excessive effort required to open and close the damper.
If these issues are found, your ship will be detained until it is fixed.
Routine checks and maintenance must be done to make sure fan mechanism and attachment of discs/louvers to shafts are effective. When checking fire dampers regularly and before an inspection, make sure to check:
- they are properly marked open and closed
- the locking pins are free to be removed without excessive effort
- the operating handles are free to move without excessive force
- the operation is smooth and operates through the full range of motion.