We have a great track record in the precision dumping of aggregates subsea onto and around subsea assets. We use bottom opening bulk bags with subsea deployment frames for stabilisation, scour-mitigation and free span correction.

In comparison to traditionally used techniques, our precision rock dumping solution reduces project cost by removing the need for a dedicated rock dump vessel. We lower aggregate to the seabed in either bottom-opening bulk-bags or large-capacity bulk-bags which can be tipped over underwater – allowing very precise and efficient placement of the aggregate.

Traditional spot rock dumping techniques using chuted bags, suspended on the crane hook result in a large spread of the aggregates. Similarly, dumping from a grab or excavator bucket presents the same issues and is limited to shallow water applications. In both cases, the large spread of the falling aggregates means significantly more materials must be transported offshore and installation times are correspondingly longer.

The highly accurate placement of our bottom opening bag system means less waste, less fuel burned and lower installation costs.

Our rock dumping solutions combined with concrete mattresses can provide robust stabilisation and protection measures that can withstand severe environmental conditions.