Trans RINA, Vol 157, Part C1, Intl J Marine Design, Jan - Dec 2015 Table 3 Overvie Vessels


Monohull service vessel Catamarans


Small Waterplane Area Twin Hull (SWATH)


Jack-up barges Jack-up vessels


Crane Bar rge Crane Ships


Semi-submersible platforms


Within the two types modelling.





Types CTVs CTVs


CTVs MPVs


MPVs MPVs


MPVs


ew of existing O&M vessel types Cha


Very high speed, small passe


racteristics nger and cargo


Medium speed. limited passenger and cargo


capacity capacity


Moderate speed, limited passenger and cargo capacity


Non self-propulsion. Slow, d the working area. Serve as fe


epend on other eder vessels or


enance and Construction


ships to tow them to installation vessels


Self-propulsion. Self-lifting and stabilization. Heavy Mainte Lift heavy load


for transporting the items to install


Good stability during cranes operation. Offers good deck pa and goof lifting capabilities. Cost a lot


UCL O&M model all vessels are grouped into level


selected from Table 3, for high


For small scale repairs Crew Transfer Vessels (CTV); with speed of 25 to 30kt and relatively small, transporting 6 to 14 technicians and small tools or compo nents.





For lar ge scale repairs: Multi-Purpose Vessels (MPV); Depending on the type of repair needed, different vessel types are used.


Due to the increasing number of offshore wind farms, the demand for O&M vessels is growing rapidly. A common assumption is to allocate one CTV per 35 turbines and one MPV per 140 turbines [12]. To validate the


e UCL ace


Speed (kt)


26 25


18 8


10 5


ds. Limited in speed and no deck space available 6.1 6


Passenger capacity


12 12


12 160


120 88 28


736


O&M tool, the price and capability of each vessel type was based on the published data where available.


Two marine support strateg model: A single type of la


gies were incorporated in the arrge CTV; and a mothership


with small CTV. They were represented in the UCL O&M tool and combined with the O&M strategies discussed earli er to assess their applicability to various offshore wind farm design projects and to identify the be


est solution.


The UCL modelling tool was tested on UK round 1 wind farms with available data [[11, 12], and the correlation was satisfactory (Figure 4). Further tests were carried out for UK Round 3 sites at Morray Firth and Dogger Bank. T ests were also carried out to evaluate the influence of some key parameters on the cost or on the energy output.


Figure 4: UCL Model Validation for UK Round 1wind farms [8]


© 2015: The Royal Institution of Naval Architects


C-139


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