Double D Marine 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.