SA-Fire - Model TYPE UP-NP -Foam Rim Seal System

The tank is therefore kept at atmospheric pressure and the water and the concentrate are not pre-mixed. The system is used on top of Floating Roof Tanks to protect the seal zone and is designed for early fire detection and fast suppression acting directly on the rim seal zone by means of low expansion directional nozzles. The pneumatic fire detection line runs along the whole protected arc and is used as a fire detector and system actuator. When a fire break out in the rim seal zone, the tube melts and a pressure drop is sensed by the actuator which instantly initiate the foam concentrate injection and the tank pressurization. Upon reaching the system working pressure the water/foam solution is released through a bursting disc and then discharged on the seal area. The system is calculated to discharge in a very short time variable from 30 to 40 seconds in order to extinguish the fire and avoid fire spread. The coverage of each unit shall be evaluated depending on each floating roof tank, its foam dam geometry and the NFPA 30 classification of its contents. However, in most cases the unit is valid for roughly 40 meters of seal circumference protection. On board of every unit, there are two Ex pressure switches used to control system pressurization and activation respectively Upon request is possible to equip the unit with an additional pressure switch on the discharge line, a solenoid valve for remote activation and a common pneumatic fire detection system to all units. Every installation may be configured in a point to point or common zone depending on the interconnection and cable routing that is preferred.