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Outline Specification:
The trenching module is an underslung ROV track package facilitating burial of cables. It is capable of burying cables down to a covered depth of approx. 1.5m and can be operated to a water depth of 3000 m.
The Cable burial package can be added or removed quickly from an ROV. It comprises a central frame, a jet tool, a depressor, 2 x 150 kW power packs with associated valve packs, a control system and two removable track packages that can be exchanged for skids.
The burial package uses an efficient jetting system that has the water pumps mounted directly on the tool. The jet tool is positioned at the front of the vehicle to improve burial operations. The high and low pressure pumps mount onto a manifold to which differing length jetting swords can be attached. The package is supplied with jetting swords for 1m and 1.5m trench depth.
The jet tool is designed for burial in non-cohesive seabed (sands and silts) up to a depth of 1.5m and for cohesive seabeds( with strengths of up to 100 kPa) to a depth of 1m.
| Length | 4.2m |
| Width | 2.9m |
| Height | 1.1m |
Control
System:
The following sensors are fitted:
- Tool
depth
- Tool
width
- Jet
pump pressures
- Cable
detect
- Depressor position
- Track
speed and distance
Hydraulic System:
General
functions valve pack
- Cable
cutter open/close
- Cable
depressor up/down + counterbalance slice
- Cable
depressor left/right + counterbalance slice
- 3 x
water pump isolate valves (single function)
- Upper/lower
jet selector valve (single function)
- Burial
tool raise/lower + counterbalance slice (option)
- Tool
rotate up/down + counterbalance slice
- Tool
open/close + counterbalance slice
Proportional
valve pack
- 3 off proportional pressure reducing valves for water pump speed control
- 2 off
proportional flow control direction control for track drive