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...

Horizontal negatively buoyant jets in deep sea mining: The influence of initial concentration of discharged slurries on the spatial spread of turbidity currents

Recently, deep-sea mining has acquired renewed interest from commercial companies due to a rise in the demand of minerals and metals. Deep-sea mining is focussed on different minerals and rare earth elements found in the oceans that are increasingly used in the manufacturing of goods and products related to renewable energy. In order to collect...

Modelling of high concentration fluid mud water injection dredging density currents

Siltation of fine (cohesive) sediment in navigation channels and harbour basins may cause serious problems for the shipping industry. Intensive maintenance dredging is required to ensure safe shipping traffic. Conventional dredging methods are highly expensive, and therefore port authorities seek for more efficient solutions to reduce costs. One...

Transient Slurry Flow Phenomena after Bends in the Vertical Plane: An experimental study and analysis into the origin and development of density waves within pipeline systems using a sedimentation and erosion unbalance model

Density waves inhibit the stability of (long) pipelines, which cannot be predicted using current day design tools. Density waves are formed due to an inverse relationship between sand eroding and settling in a pipeline. By designing and building a dedicated flow loop, an experimental study on how the erosion and sedimentation of sand in a pipe...

Offshore Pipeline Flotation during Sand Backfilling with a TSHD: An Experimental Study

Offshore pipelines represent major items in the oil and gas industry nowadays. These submarine pipelines are usually covered with backfill for protection and a well-known method for this is sand backfilling with a trailing suction hopper dredger (TSHD). Although pipeline installation with a TSHD is a developed technique, there are still some...

NPSHr scaling in centrifugal pumps: Investigation of the influence of impeller speed and diameter on NPSHr properties of centrifugal pumps

One classic challenge in pump operation is the occurrence of cavitation. Cavitation is the forming of vapour bubbles in a fluid due to a local drop in pressure, followed by a subsequent implosion of those bubbles due to an increase in pressure. The vapour formed can significantly decrease pump efficiency and the implosion can be detrimental to...