Replenishment at Sea Systems (RAS)
We are an experienced partner when it comes to different types of Replenishment systems. The systems are designed for transfer of liquids abeam as well as liquids astern (RAS-L) as well as solid goods (RAS-S). The safe and energy efficient winch driven ship-to-ship connection is constantly tensioned using a unique hydro-pneumatic tensioner.
The process of replenishment and refuelling ships at sea can take place in demanding situations, from being underway in rough weather conditions to experiencing freezing temperatures at the arctic seas. In order to ensure a safe and reliable exchange of solid goods and liquids in various conditions at sea, Van Halteren Technologies Replenishment systems meet the industry quality standards with respect to technology, functionality, safety, economy and class conformity. As a partner already in the engineering phase, Van Halteren Technologies is able to develop systems making use of creative innovations to exceed these industry standards plus it can save you maintenance time and costs, not to mention improving availability over the complete life cycle.
Throughout the years we have delivered both electrical and hydraulics-based replenishment systems. Hydraulics are usually more compact and may have advantages in power consumption. In case hydraulic power is already available in the ship’s design a substantial reduction on the costs can be expected by using hydraulic replenishment solutions. Electrical replenishment systems on the other hand are less complex and easier to maintain.
Fuel / Liquids (RAS-L)
For the Abeam Method a tensioned support line (spanwire) is tensioned between the delivering and the receiving ship. Transfer of liquids is done via hoses that are suspended in loops by trolleys on the spanwire. This method is suitable to transfer all types of liquids (diesel, aviation fuel, water) each using a separate hose selected to meet the required capacity.
The Astern Method uses a floating hose that is paid out and connected to the receiving ship, steaming at a safe distance behind the delivering ship. Automatic approach and stopping of the winch drum in the correct fuelling position is included in our system design, as is an emergency hand drive.
For the transfer of solids a tensioned support line (highline) is used to support a traveller block assembly, which carries the payload from the delivering ship to the receiving ship and vice versa. The system is designed to transfer single objects as well pallets or containers at a high transfer rate.
RAS Receiving Stations
RAS receiving stations comprise of a connection point to connect the highline or spanwire on the receiving ship and dedicated, standardised receiving flanges or probes for the liquids. The connection point to receive solids can be a fixed pad eye or a electric driven sliding pad eye to lower the load onto the deck of the receiving ship.