RISK MANAGEMENT
INHERENT RISKS TO OFFSHORE POWER CABLES
Cable route planning is critical. The dynamic nature of the offshore environment makes a comprehensive routing analysis critical. Sand waves, movement of mega ripples and erosion, as well as the removal/ aggregation of sediment can result in seabed movement during the cable’s operational life. This can be compounded if an inappropriate burial depth or unsuitable technique is used.
PREVENTION
To prevent possible cable exposure BPP- Cables recommend local and global scour analysis to reduce the risks of free-spans associated to vortex induced vibrations (VIV), fatigue or excessive cable tension.
MOISTURE INGRESS
Detrimental water treeing in cable electrical insulation is caused by the ingress of water, moisture, or vapour. These dielectric layers must be kept dry as humidity accelerates ageing, as does prolonged periods of overvoltage or overheating. In shallow water and splash zones, sunlight can damage the external polymeric layers.
Engineering cable joints ensures continuity of the conductors, shields and insulating layers. Poor jointing will affect the cable performance. Mechanical stress, thermal and mechanical cycling as well as vibration may result in fatigue of the metallic components or causing the connector to fail.
GAS
Gas can gather within cable interstices over the operational life. Whether it is caused by inadequate degassing of the insulation, or electrolysis within the cable, it can be corrosive to the cable’s metallic components. This can lead to significant damage to the cable structure.
CABLE EXPOSURE
Submarine cables that are exposed to external hydrodynamic loads that can cause cyclic loading and fatigue damage. Free spans caused by an unstable sea environment can result in VIV of the cable. BPP-Cables recommend the cable installation and installation procedures are comprehensively analysed at an early stage.
SUMMARY
The financial and technical risks to offshore power cables are significant. BPP-Cables offer an appreciation of submarine cables primary risks that can significantly affect the performance of cables. In addition, the company can highlight the potential financial, technical and reputation costs.
BPP-Cables
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