Exploration • Drilling • Field Services
the TMS frame) and garages (receives the ROV horizontally and provides protection around the ROV). Both types are equally effective with their own set of pros and cons.
needs to be added to the system. LARS consists of a support structure capable of moving the TMS and ROV arrangement from the deck to the water safely. SeaBotix uses a 20ft shipping container to accommodate deep deployment of MiniROVs. It provides space for a motorised winch where the LARS is small enough to be integrated as part of the container.
Fig. 2. Clump Weight is a method to remove the effect of the tether drag from the MiniROV.
A typical configuration consists of a TMS deployed from a strength armoured umbilical. A mechanism inside the TMS (usually an underwater winch) deploys the tether for the ROV excursion.
Near the ceiling of the container, a twin boom system is deployed outside the container through double doors offering 3m of overboard reach. Mounted towards the end of the twin boom support structure is a hydraulically damped docking cone with two degrees of motion to help prevent umbilical wear when the TMS is deployed and the ship is pitching and rolling. Te winch system responsible for deploying
Fig. 3. A Tether Management System can be used to operate in currents and deeper waters .
MiniROVs are often deployed manually due to their light weight; however, deep water operation requiring a TMS makes manual deployment nearly impossible. A Launch and Recovery System (LARS)
the TMS can be outfitted with an active heave compensation module which has the ability to safely deploy and retrieve the ROV back to the TMS in higher sea states. Te container also includes an AC controlled room for 2 operators. Te SeaBotix Containerized Delivery System (CDS) offers a fully integrated TMS, MiniROV & LARS package with small footprint for cost effective deep water applications. ●
For more information ✔ at
www.engineerlive.com/iog
Cyril Poissonnet is CDS Program Manager with SeaBotix Inc, San Diego CA, USA.
www.SeaBotix.com
www.engineerlive.com 27
Fig. 4. SeaBotix uses a 20ft shipping container to accommodate deep deployment of MiniROVs.
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