Probabilistic approach for the optimization of pipework inspection and maintenance

Fluctuating oil and gas prices, coupled with initiatives toward energy security, drive the global storage market of oil and gas. A tank farm, often referred to as a terminal, is an industrial facility for the storage of the oil and/or petrochemical products. Vopak's biggest terminal, Vopak Terminal Europoort (VTE), has an immense capacity of 25...

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...

Motion behaviour analysis of 18" ILT-structures

220 miles offshore the West-Australian coast lies the Ichthys Field. In 2013 Heerema Marine Contractors (HMC) was contracted to install the umbilicals, risers and flowlines for the Ichthys Project, including the installation of several in-line structures such as in-line tees (ILT) and flow-line end terminations (FLET). The ship assigned to these...

Passing vessel interaction: An assessment of MARIN's FlowInteraction module

In order to accurately predict passing vessel interaction forces, different simulation tools have been developed over the years. Many of these are based on a double body flow approach. MARIN (a hydrodynamic research institute located in the Netherlands) developed a simulation tool called the FlowInteraction (FI) module, which is part of the...

Gradient-based optimization of jacket support structure for offshore wind turbines with the local approach

Offshore wind turbines are exposed to complex irregular and highly fluctuating environmental conditions. The analysis is, therefore commonly performed in the time domain, resulting in a time consuming and computationally demanding optimization process. In order to reduce the computational cost, an optimization approach using the principle of...

An Analysis of the Dynamic Behaviour of a Noise Mitigation System During Installation

The Ocean Cleanup Barrier: A hydro-elastic model for fatigue lifetime assessment of The Ocean Cleanup barrier

The Ocean Cleanup proposes to place a huge barrier in the ocean in order to clean it from plastic waste. Plastic will be caught as it flows towards the barrier on the ocean’s currents. As such a structure has no precedent, the concept has to be engineered from the bottom up and tested extensively. The barrier has a relatively shallow draft and...

Design of experiment to measure swab pressure and mitigation of swab pressure due to cone pop-out

Low Frequency Second Order Roll of a Semi-Submersible Crane Vessel

Heerema Marine Contractors is constructing a new semi-submersible crane vessel, the Sleipnir. Due to low initial stability, semi-submersibles may present significant wave induced resonant motions in heave, roll and pitch. For practical reasons, especially the roll motion could play a limiting factor for future lift operations of the Sleipnir. In...

Application of extreme value theory for the assessment of turret moored floating structures

In the design of mooring systems, it is a common practice to use a 100-year design environment to calculate extreme responses. Statistical inference is executed on the environmental data to produce a 100-year environment. This 100-year environment is then simulated to calculate the loads that occur when the vessel is under the influence of the...

Development of an improved shielding model for vessels and offshore structures

MARIN has developed the computer program WINDOS for the calculation of wind loads on vessels and various offshore structures. To account forwind shielding effects,semi-empirical relations based on Schlichting’stheory for free turbulent flow are used within the program.An extensive WINDOS investigation is carried out in comparison with the wind...

Mooring Optimization in Time Domain using Harmony Search

The design of a mooring system can be a frustrating and time consuming task, owing to the large number of design cases, software interfaces and sometimes changing requirements. Although frequency domain is a faster method, the behavior of the FPSO and the loads on the turret mooring system in a certain environment is most accurately predicted in...

Conductor Installation within Monopile Foundations using the Swift-10 Drilling Rig

In 2005 Shell introduced the first monopile satellite platform with the aim to reduce the capital expenditure required for offshore wells. Currently there are 6 of these platforms installed in the Southern North Sea managed by Shell. The main functions of these platforms are to house the wellheads and divert produced hydrocarbons into a subsea...

Ocean Waves Reanalysis of Operational Based Method: Wave Forecast Error based on the encountered OCTOPUS wave database

Dockwise started in 2008 with the OCTOPUS motion monitoring and captain decision support system for performance optimization and bad weather routing capacity. The OCTOPUS-Onboard system gathers weather and motion data, which is collected in the OCTOPUS database. This database includes the encountered weather data and the measured accelerations...

Drilling concept for exploration of the deep water lakes of East-Africa

Development of a novel drilling concept for exploration of the deep water lakes of East-Africa in a cost effective way.

Dynamic behaviour of floating wind turbines - A comparison of open water and level ice conditions

In the past couple of decades, the offshore wind industry has developed from applications in shallow water to ever deeper, more remote locations with harsher environments. In these progressively larger water depths, bottom founded support structures become no longer applicable and floating support structures could provide a viable alternative....

Local buckling collapse of marine pipelines

To keep up with the growing demand for oil and gas, the oil and gas industry ventures into deeper waters. For a deep water pipeline project, South Stream, a pipeline test program is developed. Part of this program is the investigation of the resistance of an externally pressurised pipeline against local buckling collapse. This is a decisive...