| Engines, hydraulics, fuel lines and electric installations constitute the most severe fire risks on a vehicle. The fires often are severe and are difficult to reach with a hand extinguisher.
The development of the Forrex system is based on our experience of fire suppression systems for vehicles. The Forrex system combines the advantages of halon and dry chemical installations:
· a high efficiency extinguishant reducing the risk of reignition
· space saving equipment adapted to installation on vehicles and made for the most severe working conditions.
Construction
Fire suppression system
The FORREX-installation normally protects engines, torque converter, hydraulic equipment and brakes. The systems are designed to provide a minimum of 3-5 litre of extinguishing agent per cubic meter of protected volume, the agent is stored in one or more tanks.
The tanks are activated electrically via the fire control system or manually on the tank valve or from a pull handle.
Fire alarm
The hazard area are fitted with heat sensitive detectors. The control unit and a separate alarm lamp are positioned in the cab. An alarm horn can also be included in the installation.
Any fault in the detection or actuation system is indicated by LEDs on the control unit. Alarms and fault indications can be tested with a switch on the control unit.
System types
 There are three main types of system - mechanical, manual, and fully automatic.
Mechanical system
Comprises only a manual fire suppression system installation and no fire alarm or other electric components. If a fire occurs, the tanks are actuated manually either directly on the valves or from a pull handle.
Manual system - Warning only
The mechanical system complemented with a fire alarm. At fire, an alarm horn and an alarm lamp are activated. The tanks are operated manually either from an electric push button on the control unit in the cab or from a pull handle.
Automatic system
At fire alarm, this system will automatically actuate the extinguishing installation and if specified can be configured to stop the engine. The system can be set for manual operation only, when the vehicle is run on a public road. There are also automatic systems with delayed actuation of the extinguishing installation. They do not discharge the extinguishant until 10 to 20 seconds after the cut offs have been activated, when engine and fans have come to a full stop.
FORREX
The liquid used in the Forrex system is specially produced for use on vehicles. It copes with fires in flammable liquids like petrol, diesel and hydraulic oils and in burning solids like wood and peat. It smothers quickly and efficiently e.g. diesel oil flowing from a burst fuel pipe or hydraulic oil sprayed under pressure. The liquid will also stay on a bed of saw dust, chips and the like, reducing the risk of reignition.
FORREX systems require little space and are easy to clean up after a fire. The tanks are designed such that thay can be fitted horizontally or vertically. After use, the protected area must be cleaned. This can be done just by flushing with water.
Function
Fire is indicated by heat detectors, closing an electric circuit to the control unit, which in its turn activates the mechanical/electrical valve on the FORREX tank. Audible and visual alarm signals are activated by the fire and also a pulsating light in the manual firing button on the control unit in the cab. If automatic relays are connected to the control unit, these are activated at the same time as the fire suppression system, e.g. engine cut-off or a fuel solenoid. Manual operation of the installation can be made from the firing button on the control unit or with the pull handle.
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