Chapter 4: Application guidelines
Alarmline II Digital Linear Heat Sensor Cable Technical Manual 29
Figure 6: Sensor cable installation for cable trays
‘V’ clips are designed to support cables underneath layers of cable trays (this is a
spring steel clip designed to fit the standard holes on a cable tray).
Floating roof storage tanks and bund areas
Floating roof storage tanks are a high risk application and liaison with
experienced site personnel with regards to the design and installation
requirements is essential.
Floating roof storage tanks are specifically designed for the safe storage of
petroleum products such as crude oil or concentrates and the roof is designed to
move up and down as the liquid content of the tank changes so there is no
vapour space. A rim seal system is provided between the tank shell and the roof
which prevents rim evaporation.
Alarmline II Digital Sensor Cable can be installed to detect an overheat condition
or fire around the rim seal and can be used to provide a control signal to an
automatic firefighting system (such as a foam system).
Sensor cable is installed close to the upper edge of the weather seal, using the
roof’s steel straps or the edge of the foam dam, where provided, as anchor
points. Alternatively, support clips may be provided to suit. Sensor cable (or its
interconnection wire) should be installed with consideration for the rise and fall of
the floating roof, preferably using an approved retractable cable system (see
Figure 8 on page 30).
Alarmline II Digital Sensor Cable is classified as a simple device and therefore
requires no certification for use in hazardous areas, although suitable safety
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