It is standard practice to install fire detection systems on internal floater storage tanks. However, the movement of the internal floater sometimes causes problems with the internal wiring which is difficult to reach leaving the fire detection system unavailable for long periods.
For fixed roof storage tanks with an internal floater roof Saval has developed ClearView. With this solution all equipment and cabling is installed externally of the storage tank.
A set of 3 flame detectors are to be used on each storage tank. These are installed with a spacing of 120° around the tank roof. The maximum distance between the detector and the fire is achieved when the tank is nearly empty. In general a fire of 120cm x 30cm in the foam dam is easily achieved and acceptable. This results in a maximum detection range of 90m when for example diesel is used.
The maximum detection disctance for other fuels with the same fire size are:
+ Heptane 136 meters
+ Isopropanol 61 meters
+ Ethanol 108 meters
+ Methanol 77 meters
+ Multi spectrum infrared flame detector providing detection of fires from light to heavy hydrocarbon fuels (typical 3 flame detectors to cover the complete tank surface).
+ Roof tank conne ction set, the interface between detector and tank roof.
+ Roof side interface design plans (roof modification in customer supply).