Simulating Bending Failure of Ice using Smoothed Particle Hydrodynamics: A re-usable framework for simulating of fluid problems using SPH

The offshore industry is a conservative industry, sticking to rigid best-practices and reluctant to try new techniques. A promising new technique that hasn't found much adoption in offshore industry is SPH. This thesis aims to improve the reach and use of SPH within the offshore industry. With an abundance of world's unexplored hydrocarbons...

Improvement of a Subsea Hot Stab Operation

Subsea pipelines that are used for the transportation of oil or gas are installed by pipe-laying vessels. When a pipeline is laid to the seabed, both ends of the pipeline are sealed with an end-piece. This end-piece fulfills an important role when the pipeline is being commissioned. In order to be accepted, the pipeline has to undergo Flooding,...

Feasibility and Favourability Study Upend/Tilt-over Mechanism of Pioneering Spirit’s Jacket Lift System

Allseas Group S.A. is a leading offshore contractor in the field of pipeline installation, heavy lifting and subsea construction. One of Allseas’ vessels is Pioneering Spirit. The main activities of Pioneering Spirit can be subdivided into pipeline installation, topside installation/removal and jacket installation/removal. The equipment of the...

Floating blade installation: Analysing the dynamic interaction between tower and installation tool

The demand for blade installation and maintenance is increasing with each additional installed offshore wind turbine. In 2017, 560 additional turbines were installed in Europe, reaching 4149 turbines in total. Currently, they are serviced with cost and time inefficient methods, such as rope access and jack-up vessels. Rope access is slow and...

Evaluation of transient lift loads during a decommissioning operation with a crane vessel

With the conversion of a heavy transport vessel into a crane vessel, Boskalis aims to strengthen its position in the offshore wind and decommissioning markets. The BOKALIFT 1, as the crane vessel will be named, is equipped with a 3,000 tonne crane and a class-2 Dynamic Positioning system. In order to utilise its exceptional large and strong deck...

Determination of Global Loads for Mooring Integration Calculations

Floating Production, Storage & Offloading (FPSO) units are extensively utilized in remote offshore areas for deep water developments where a pipeline infrastructure is not an economically viable solution. Traditionally, FPSOs are converted from oil tankers, which entails that they are not equipped with an appropriate mooring system. A spread...

Design Assesment of the Sawing Wire System Used in Salvage Operations

The Smit sawing wire system was used in the salvage operation of the Baltic Ace. The sawing wire was drilled underneath the wreck and connected to two barges on opposite sides. Winches were placed on the barges to make a controlled cut through the wreck by pulling the sawing wire back and forth. The cut was made in an upward direction. While the...

Local Buckling and Collapse of Thick-Walled pipe

Heerema Marine Contractors is an offshore contractor who specializes in the installation and removal of a range of offshore facilities. This includes the installation of submarine pipelines in excess of 1500 [m] water depth. Higher water depths drive the pipeline designs to increase wall thickness. Another motive to apply a low D/t ratio is to...

Developing the optimal lifting solution for Jumbo to decommission offshore platforms in a single lift

For more than a decade Jumbo has been active on the offshore market performing offshore installation projects with their two DP2 J-class vessels. However, the offshore market is a continuously growing and changing market and in order to keep up with these changes, Jumbo needs to innovate and investigate new activities within this offshore market...

Dynamic response analysis of a spar floating wind turbine in level ice with varying thickness

The wind energy industry in order to find stronger winds, has to go further offshore and move into deeper waters where bottom founded wind turbines cannot be deployed anymore. This is the main reason why floating wind turbines have been studied extensively in the past years. In the case of regions with cold climates, ice loads become significant...

Improvement of the workability of monohull heavy lift vessels during lifting operations by reducing roll motion

In the past Jumbo Maritime has focused mostly on port-to-port transport of heavy loads. During the last decade their focus shifted slightly towards the offshore market: two of the J-type vessels have been outfitted with DP2 systems and deep water winches. The motion behaviour of these monohull vessels in offshore lifting operations, during which...

Dynamic Analysis on Failure Modes of Tub Mounted Cranes

The trend in Offshore Engineering is towards exploring in deeper waters and more harsh environments. As a consequence, topsides become larger and heavier. In order to keep up with the demand for more lifting capacity, Heerema announced a New Semi-submersible Crane Vessel (NSCV). This vessel will contain two 10 000mt Tub Mounted Cranes (TMC),...

Arctic stick-slip effects on a simplified moored vessel in head-on ice conditions

The stick-slip effect is a quasi-static effect that can occur with every mass-spring system that is subjected to significant amount of friction forces. It is based on the difference between the static and kinetic friction coefficient. If the relative velocity between two objects is zero, the sliding object will normally encounter a larger...