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Buried cable installation
FiberPatrol FP1150 Product Guide
Page 57
Illustrated installation recommendations
Pipeline TPI
For third party interference detection the recommended installation places the fiber optic sensor
cable 30 cm (1 ft.) centered directly above the pipeline. However, if there is an existing fiber optic
cable beside the pipe in the trench, or if circumstances make it difficult, or impractical, to install the
fiber optic cable 30 cm above the pipeline, the cable can be laid in the trench beside the pipe. The
burial depths for different types of pipelines vary, and depend on a number of factors such as the
geographic location and the installation environment. Positioning the sensor cable 30 cm above
the pipeline provides excellent detection of digging from above. Alternately, placing the sensor
cable beside the pipe on the bottom of the trench will also provide good detection for digging from
above. The maximum length for third party interference is 50 km/side (100 km total).
Intrusion detection (vehicles and human targets)
For intrusion detection the recommended installation places the fiber optic sensor cable 15 to
70 cm (6 to 28 in.) below the ground’s surface. For loose soil types that do not conduct vibrations
well, like sandy loam, a shallow burial depth is recommended. For denser more compacted soils
that do conduct vibrations well, like clay, the sensor cable should be buried up to 70 cm below the
surface. The maximum length for intrusion detection is 40 km/side (80 km total).
Figure 64: Sensor cable burial for third party interference detection
Figure 65: Sensor cable burial for intrusion detection
30 cm
ground surface
(12 in.)
2 m (6.6 ft.)
alternate location
for sensor cable
alternate location
recommended location
(site dependent)
sensor cable
pipe
pipe
15 cm
ground surface
(6 in.)
sensor cable
loose soil types
dense soil types
sensor cable
ground surface
70 cm
(28 in.)