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Double D Marine Equipment has delivered hydraulic marine cranes and equipment for the last 17 years. We provide sales, service, maintenance contracts and spare parts for hydraulic marine equipment and marine cranes.
Double D earns the business of our customers by providing quality and expert assistance in service, repairs and the design of marine cranes and new equipment. We supply the following:

Hydraulic marine cranes
Hydraulic dredge support cranes
Hydraulic offshore cranes
Hydraulic cement unloading manipulators
Radio remote control systems
Hydraulic hoisting and pulling winches
Hydraulic power packs
Hydraulic components

Hydraulic marine cranes
Double D services hydraulic marine cranes. Our technical representatives are available to provide assistance almost anywhere in the world and many spares can be delivered from stock. We offer maintenance contracts and emergency repairs in addition to new marine cranes and equipment. Our line of hydraulic marine cranes is designed specifically to operate in the harshest marine conditions.
3D marine crane technology
Double D strives to stay on the leading edge of marine crane technology. We have implemented a 3D design in order to provide our customers with as much information as possible. This way we are able to communicate better and faster with our customers and enhance their understanding of the operation and functionality of our marine cranes and equipment.
Custom marine cranes and accessories
Double D’s marine cranes can be delivered with a variety of accessories and built as standard or according to customer requirements.
Manipulators for unloading cement, fly-ash, alumina and limestone
Manipulators are specially designed for unloading cement, fly-ash, alumina and limestone. Our manipulators are used, among others, by Van Aalst Bulk Handling. This company is specialised in pneumatic equipment for loading, unloading, conveying and storing of powdered, dusty, abrasive materials.
Stiff boom cranes
Stiff boom cranes are most suitable when the amount of space on deck is ample. These cranes offer a cost-effective alternative to knuckle booms or telescopic booms. A hoisting winch is always a necessity when using stiff boom cranes.
Knuckle boom cranes
Knuckle boom cranes are designed to reduce the 'pendulum effect' of the load. They are highly popular as in the folded position they make use of the smallest amount of deckspace as possible.
Telescopic boom cranes
Telescopic boom cranes are ideal for situations in which the amount of space on deck is limited. The 'pendulum effect' is reduced, as opposed to stiff boom cranes.
Dredge support cranes
Dredge support cranes are specially designed for the dredging industry, as opposed to standard marine cranes. Dredge support cranes are used in harsh conditions, for example, working pontoons, in order to handle devices such as anchors, floating pipelines and cutterheads.
Remote radio controls for marine cranes
Double D cranes can be optionally controlled by a radio remote control system, which consists of the following components:

Danfoss load-independent proportional control valve block, with electric activating modules built at the crane column for the following movements: slewing, topping, knuckling, extension and winch (if applicable)
Selector switch to select manual control in case of radio remote-control failure
Remote control box (transmitter) complete with joysticks, operator's belt and emergency stop button
Radio-receiver built at the crane column
Radio installation with a back-up cable; complete system is in accordance with the European normative

Power packs for marine cranes
Double D will deliver an electric/hydraulic power pack for inboard installations. The power pack includes a tank-top return filter as well as a pressure indicator, a level gauge, a de-aerating device, a filling cap, a low level switch (not wired) and a high temperature switch (not wired).
Marine crane hydraulic winch load-limiting device
Double D offers an optional hydraulic winch load-limiting device (LLD), which can be installed between the marine crane arm and winch plate to protect the winch against overloading. This situation can occur when the operator tries to hoist a heavier load with the cylinders than the permitted line pull of the winch.
The winch overload signal will be measured by means of a stainless-steel adjustable pressure switch fitted on the LLD. This hydraulic safety device construction is completely made out of 316 stainless steel.
Hydraulic-hoisting winch installation
Double D’s marine cranes can be installed with an optional hydraulic hoisting winch installation, suitable for single or double line use, complete with a hoisting rope, a swivelling top sheave and a swivel hook with counterweight. The winch consists of a drum with planetary gearing, and internal automatic multi-disc spring applied/hydraulic released safety brake.