Feature 8 | SEALIFT/LOGISTIC SUPPORT


At-sea crane transfer system demonstrated


Te USNS Flickertail State (T-ACS-5) recently successfully tested the Office of Naval Research’s large vessel interface liſt-on/liſt-off (LVI Lo/Lo) crane at Naval Station Norfolk, the LVI Lo/Lo being part of a raſt of systems being tested to make the concept of seabasing a reality.


The USNS


Flickertail State (T-ACS-5) recently successfully tested the ONR’s LVI Lo/ Lo crane at Naval Station Norfolk.


rapid transfer between ships, even in high seas. Te ability to transfer payloads at sea will allow the US Navy to sustain its presence for military operations, humanitarian assistance, and other long-term engagements. Te project is led by an industry team


T


led by Oceaneering and also includes Cargotec, and ATR, who developed the LVI Lo/Lo advanced crane control system. Te Oceaneering team is developing and demonstrating technology to achieve ship-to-ship cargo transfer between two ships that are moored ‘skin-to-skin’ and underway in up to Sea State 4.


Warship Technology July/August 2010


he LVI Lo/Lo concept supports the US Navy’s seabasing initiative by providing a means for safe,


Te robotic crane project is funded


by the Office of Naval Research and is called High-Capacity Alongside Sea Base Sustainment, Large Vessel Interface Liſt-On/Liſt-Off (HiCASS, LVI LO/LO). ATR describes the LVI Lo/Lo crane as


“an advanced motion-compensated at-sea cargo transfer system that will be able to transfer fully loaded cargo containers between ships at sea in Sea State 4 and below by providing six degrees-of- freedom control of the payload without taglines”. The system enables the rapid, safe


at-sea transfer of standard ISO containers and other heavy loads from military and commercially available ships onto a seabase.


The system is intended to have the


•Maintain optimal cargo throughput rates through Sea State 4.


capability to:


• Transfer cargo between two ships directly alongside each other at zero


forward speed or underway at slow speed in the open ocean.


Motion sensing and compensation for


the ships and/or the cranes will allow safe and efficient transfer of cargo. Currently, to off-load a container ship,


it must have a safe deepwater port. By adding the LVI Lo/Lo crane to the seabase, the container ship can be offloaded at sea, with the containers transferred to other modes of transportation for the final leg


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