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...

Last line of defence: Cyber security of industrial control systems

The world is rapidly embracing networked technology and transitioning into one of hyperconnectivity, a term first coined by social scientists Anabel Quan-Haase and Barry Wellman. Increased connectivity provides benefits such as automation and, remote access and control of networks and equipment, thereby decreasing operational costs. Maritime and...

Radiation, Diffraction Analyses on Side by Side Applications

Offshore barge mooring is considered a critical operation. The vessels need to be in close proximity, but may under no circumstance collide. Mooring lines and fenders are installed to keep the vessels in place. Experience has shown that lines tend to break occasionally; one of the reasons for this can be the interaction effect of the two vessels...

Feasibility of increasing the pedestal height on the J-class vessel by 10 meters

In order for Jumbo to stay competitive in the offshore market, it's heavy lift vessels should be able to take on a wide range of lifting purposes. This can range from installation of transition pieces for wind turbines to installing modules of fpso's and platforms. One of the demands from the offshore market requires large lifting heights. It is...

A research to decrease the duration of the lifting phase for the Jumbo J-class, focussing on heeling

For offshore installation projects Jumbo uses her J-class heavy lift crane vessels. The objects that need to be installed offshore are carried at deck or in the ship's hull. At location the object is lifted by the on-board heavy lift crane and slewed to the side of the ship. From the final overboard position the object can be lowered to the...

Improving decision making in offshore Brownfield projects

Brownfield projects are projects done on existing, live facilities. These type of projects have a poor performance record in terms of cost and schedule predictability. Based on findings from industry wide and internal company research, this study developed an approach to mitigate the cost and schedule growth by tailoring the development to...

Upending of a Monopile for an Offshore Wind Turbine Foundation

The subject of this report is the upending of a floating monopile for an offshore wind turbine foundation. This is an assignment of Van Oord Dredging and Marine Contractors BV. An analytical model has been developed to simulate the upending of a monopile in MapleTM, based on the general theoretical principles and the experience of Van Oord. An...

Concept study for offshore seaweed farming: Design and feasibility study for large scale mechanized seaweed cultivation systems

Seaweed has been part of human consumption ever since humanity met with the oceans. As technology developed more applications for these macroscopic algae were discovered. Global population increased, technology advanced and people started to understand the lifecycle of seaweed allowing them to cultivate seaweed. Seaweed is currently cultivated...

A Novel Method for Installing Offshore Wind Turbine Blades with a Floating Vessel

Trends in the offshore wind market show that newly installed wind farms move towards deeper waters. Wind turbine generators are currently installed using jack-up vessels, which have a limited operating depth. Installation of wind turbines using a floating vessel is an alternative for the current method, but blade installation is an area which is...

Multiaxial fatigue criteria for offshore mooring chains subjected to out-of-plane bending

The out-of-plane bending of offshore mooring chains leads to a rapid deterioration of the chain, ultimately leading to failure in a period that is a fraction of the design-life. The deformation of the contact surface of the chainlinks leads to the interlocking of the link. This in turn causes the chain to behave like a bending beam. The...

Experimental study on the development of abrasion at offshore concrete structures in ice conditions

Concrete structures in marine environments subject to sea ice interaction are at risk of erosion and damage. Industry is interested in characterizing the ice abrasion phenomenon so that abrasion risk can be managed. The experiments conducted in this work have an exploratory character in order to identify the abrasion phenomenon and qualitatively...

Predicting scale effects on floating offshore wind turbines

Floating wind turbines are becoming fashionable within the Renewable Energy world. In the last years MARIN has been involved in an increasing number of projects for the offshore wind industry. The complete simulation of a full-scale free-floating wind turbine under waves and winds using viscous-flow (Unsteady-Reynolds-Averaged-Navier-Stokes...