Product Development of Seawater Hydraulics
Master thesis
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https://hdl.handle.net/11250/3019264Utgivelsesdato
2022Metadata
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Sammendrag
The sub-sea industry mainly uses hydraulics with mineral oil as the pressure medium foroperating tools, manipulators, and drive for Remotely Controlled Vehicles (ROVs). Usingmineral oil as the pressure medium comes with several advantages, however, hydraulic systemsare linked to leakage, a threat to the environment. Leaks of mineral oil can also lead to delaysof production, as operations has to halt until the leak has been rectified. It has thereforebeen necessary to explore options that mitigates the issue of mineral oil leaks, where onealternative is electric power. With electric drive comes challenges making it not suitable forevery application, especially when considering the rough handling of tools by the ROV, andwater intrusion in deep sea environment. Development- and recurring cost for electrics is alsosubstantially higher compared to hydraulics.
To mitigate issues related to mineral oil hydraulics and electrics, Oceaneering AS has startedexploring the possibility of hydraulics using seawater as the pressure medium. This thesistherefore explores possible concepts of three key components in a seawater hydraulic system;cylinder, motor, and linear actuator. By using the V-model, Concept of Operations hasbeen developed for seawater hydraulics as a whole, and Needs and Requirements matriceshas been developed for each component. Existing solutions and literature has been reviewedto asses possible feasibility of seawater hydraulics. Furthermore, proposed motor, cylinder,and actuator concepts has been developed into detailed 3-dimensional models with suggestedmaterial selection.
In addition, Finite Element Analysis has been performed on three key components from theconcepts to verify design choices and unveil needed alternations.