Rim Seal Fire Protection System
Rim Seal Fire Protection System is the most preferred fire protection system for Floating Roof Storage tanks.
In these tanks, there exists an area, which exposes the hydrocarbon vapour to air, which is known as rim seal area. This system is used in order to provide automatic fire detection and instantaneous fire suppression within this rim seal zone in incipient stage.
The complete Automatic Rim Seal Fire Detection and Extinguishing system detects even incipient fire through Linear Heat Sensor (LHS) Cables. The extinguishing vessels are permanently pressurised with nitrogen and delivers foam on to the rim seal area through discharge nozzles within very short time duration of fire detection.
The different components include:
- LHS Detection System
- Nitrogen Pressurised Foam Modules
- Electrical Panel based Automatic Actuation System
In the event of fire, the LHS detects the fire and gives an annunciation in the panel. Simultaneously, the signal is used to automatically actuate the solenoid valve fitted on the foam discharge module which is mounted on the roof of the floating roof tank.
With the operation of this foam module, foam is discharged in the rim seal area through aspirating type discharge nozzles on the pipe network and in turn extinguishes the fire.