DP challenges in Ana platform jacket installation

Installation of jacket platforms requires simultaneous and combined operations of multiple assets. When the whole process has to be planned, it is necessary to predict in a fast and reliable way the possible weather limitations that may occur during the operations. The paper will present the major challenges of this unusual and innovative...

Installation of the Subsea Buoyancy Gravity Energy Storage System: Assessing the dynamic behaviour of the SBGESS during ultra-deep water installation by using non-linear vertical displacement models

To meet the targets set at the Paris climate convention, a rapid decrease in the emissions caused by the process of extraction of fossil fuels is required. Especially offshore, where a grid-connection is often non-existent, having power supplied by local renewable energy sources with a variable power generation can potentially lead to problems...

Offshore Wind Turbine Installation Using a Double Slip Joint: Investigating the Installation Behavior of the Double Slip Joint During the Lowering Phase of a Wind Turbine Tower onto a Monopile

One of the challenges associated with offshore wind turbine installations is the mating phase. Aligning a transition piece onto its substructure under offshore conditions is a complicated and time-consuming procedure. Another issue found in a number of commissioned offshore wind turbines is related to the sustainability of the connection between...

QUAD Lift Workability Analysis: Evaluating the Dynamic Interaction Between Two Dual crane Vessels using a Frequency Domain Modelling Technique

A QUAD lift is a new lifting method in which dual crane vessels combine their vessel capability to increase their offshore lift performance. The use of the Jumbo J-Class vessels in a QUAD lift creates the opportunity to increase the offshore lift capacity and to install structures with larger dimensions. When floating vessels are close to each...

Limits of Offshore Wind Turbine Installation with the Double Slip Joint: Offshore WTG Tower Lowering and Mating with a Double Slip Joint Connection Using Catchers and Tower Guidance. A Determination of Installation Limits and Exploration of Workability

In current offshore wind turbine (WTG) tower installations, bolted flange connections are common. These connections are however reaching their limit due to the maximized size of the bolts. Also, bolted connections require the motions between the tower and foundation to be limited during installation, suggesting their workability of installation...

Fatigue analysis for offshore power cable installation

Over the last decade, the demand for offshore power cables has increased significantly due to, in particularly, the emergence of offshore wind. Despite this growth, industry-wide rules and guidelines to analyse fatigue during cable installation operations are yet to be developed, even though fatigue can become an important...

Backstepping Control of Heavy Lift Operations with Crane Vessels

Offshore structures with large mass are installed and removed by heavy lift vessels. During offshore constructions, two safety-critical interconnected operations take place, the dynamic positioning of the vessel and the lifting of the heavy structure by an immovable boom crane on the vessel. Existing studies on offshore boom crane control...

Lateral bearing capacity of GBM Vibro-drill installed monopiles: A worst-case scenario analysis

Offshore wind turbines are commonly supported by monopile foundations. Impact hammering is the conventional method for installing offshore monopiles but has several disadvantages. Time-consuming installation procedures, high noise emissions and steel fatigue due to the high impact are problems resulting from this installation procedure. GBM...

Offshore Wind Farm Installation Planning: Decision-support tool for the analysis of new installation concepts

In order to assist project developers in efficient offshore wind farm installation planning a decision-support tool has been developed. The tool combines Discrete Event Simulation and Black-box Optimization. The focus of the development was on providing the flexibility allowing a user to compare various installation strategies and impact on the...

Towards a Roadmap of IHC IQIP: Oil & Gas Market Analysis

To plot the roadmap for the oil & gas sector, it is essential to do the market demand analysis and research the influencing mechanism of oil price on the offshore projects market and offshore equipment market. The equipment market of IHC IQIP is primarily the market of offshore structures installation. This project is combing the technology...

Monopile installation assessment: A critical assessment of an oscillating monopile during offshore installation

An offshore wind turbine requires a stable support structure to support the tower and nacelle. The support structure in the form of a monopile is lowered to the seabed and hammered in the soil. During the lowering process the monopile may show excessive motions, that occur on an irregular basis. The cause for this is unknown. This thesis is...

Environmental limitations in suction bucket based jacket foundation installation, using vertical lift-off from a jack-up vessel

In order to gain insight in maximum wave conditions in which installation of a four-legged suction bucket based jacket foundation could safely take place, a 2D time domain MATLAB model has been created, containing the most important features of a heavy lifting jack-up crane vessel and its appropriate rigging elements. The model is used to...

Structure-Borne Wave Radiation by Impact and Vibratory Piling in Offshore Installations: From Sound Prediction to Auditory Damage

Anthropogenic noise emission in the marine environment is a key issue nowadays and has drawn the attention of regulatory bodies in various nations. In particular, the noise generated during the installation of foundation piles for the offshore wind industry is considered to be harmful for aquatic species. A reliable prediction of the underwater...

An Experimental Study of Wave Forces on Slope

The phenomenon that waves break in sea has long been existing, but the nature of wave breaking and the effects it would bring have not been weIl understood. However, as nowadays more and more offshore installations go to deep sea and/or are operated under more violent wave climates, the effects, which are caused by breaking wave impingement up...