Semi-resolved CFD-DEM simulations of the rock behavior inside an inclined fall pipe

With the shift to renewable energy becoming more important than ever before and offshore wind farms being one of the sustainable energy resources available, many offshore wind farms are currently being built. <br/>One of the difficulties of these wind farms built with monopiles is that the monopiles and electricity cables must be protected from...

Quantifying volume loss from rock penetration in sand during subsea rock installation, using a fallpipe vessel

In the field of offshore engineering, subsea rock installation has emerged as a pivotal technique. As offshore operations extend to greater water depths, the deployment of a versatile fallpipe has become a cornerstone for precise rock particle placement. A comprehensive determination of the overall rock material volume required for installation...

Rock behavior in and below an inclined fall pipe

Subsea rock installation is an offshore engineering process where rocks are placed on the seabed as protection of cables and pipelines and as scour protection. The inclined fallpipebis a new piece of equipment specifically designed to install rocks close to submerged structures. This thesis investigates the processes of the rock flow in and...

Dynamic response of a deep-water SRI concept based on experimental data

As the exploration for oil and gas is shifting towards greater water depths, there is a market for subsea rock installation (SRI) at these large water depths as well. Boskalis is a key player in the rock installation market and installing rock material at water depths of approximately 3000 meters is still far from routine work. Therefore,...

On the fall process of rock during Subsea Rock Installation: 1-D modelling of the falling process in the fallpipe

Scarcity of (green) energy resources drives mankind further offshore and towards deeper waters. Protection of subsea infrastructure is of eminent importance in these environments. The key parameter to have a good control over the installation of rock is the falling time. For larger water depths up to 1200 meters, the accuracy of the falling time...

Reduction of the outflow velocity of a closed fallpipe system: The concept selection and analysis of an outflow velocity reduction mechanism

Subsea rock installation is widely applied in the offshore industry and utilized for a wide range of purposes including but not limited to: pipeline protection, scour protection, insulation of pipelines, upheaval buckling prevention and seabed preparation. Tideway Offshore Solutions is specialized in subsea rock installation and currently...

Modelling the immediate penetration of rock particles in soft clay during subsea rock installation, using a flexible fallpipe vessel.

Subsea rock installation is often used in offshore engineering. With offshore activities in increasing water depths a flexible fallpipe is currently used to accurately install the rock particles. The total required volume of rock material during installation can be determined by summing the geometrical volume, the operational losses and the...