Why Choose YUNTIAN Marine Offshore Cranes?

Innovative Engineering & Proven Expertise
YUNTIAN Cranes is a leading manufacturer of offshore cranes. We provide advanced technology and reliable equipment for marine operations. Our cranes perform well even in the toughest offshore conditions.

Key Advantages
✅ Flexible Power Options

Can use Hydraulic Power Units (HPU) or Electric Winches
Modular design: HPU and winch can be mounted on the crane or below deck

✅ Smart Control System

All functions—such as tension modes and winch operations—are built into one easy-to-use control system developed in-house

✅ Made for Harsh Sea Environments

Resists corrosion in saltwater
Stable in strong wind
Certified for ship-to-ship transfers and lifting people (optional)

✅ High Performance & Flexibility

Lifting capacity: 1–40 tons (SWL)
Reach: 10–40 meters
Boom types: Fixed, Knuckle-Jib, or Telescopic
Optional explosion-proof design for dangerous areas

✅ Designed for Operator Comfort

Large air-conditioned cabin with user-friendly controls
Advanced Load Moment Indicator (LMI) for safety
Optional hydraulic air cooler to maintain performance

Main Features of YUNTIAN Offshore Cranes

1. Strong and Long-Lasting
   Made with high-strength, anti-corrosion steel for a longer life in offshore, oil, and gas operations.

2. Accurate Operation
   Smooth hydraulic movement allows precise handling of loads, even in rough seas.

3. Used in Many Fields
   Oil & Gas: Loading and unloading on rigs, FPSOs, and supply ships.
   Shipyards: Lifting heavy items like engines and hull parts.
   Wind Energy: Helping with turbine upkeep and part installation.
   Ports & Emergency Use: Supports cargo work and rescue operations.

4. Meets Safety Standards
   Follows international rules including DNV-GL, ABS, and LR.

Marine cranes, also known as ship cranes or deck cranes, are mainly installed on vessels to load and unload cargo. They are key equipment for production operations on ships. These cranes are compact, good-looking, safe, energy-saving, and easy to operate. Their boom types include straight, telescopic, and folding arms. They can be powered and controlled by manual, electric, or electro-hydraulic systems.

A marine crane is a special type of crane used in offshore conditions. It is mainly used for moving goods between ships, sea supply, and handling underwater equipment. The sea environment makes crane control very challenging. On one hand, like land cranes, it must control load swing to ensure accurate and efficient movement. On the other hand, because the crane is fixed on a moving ship, the motion of the ship affects the load. Often, the motion where the load is lifted or placed is different from the crane’s motion.

Specifically, during operation, both the crane ship and the receiver ship roll, pitch, and heave with the waves. This causes the load to swing. Especially during lifting or lowering, ship movement may make the load hit the deck again or become loose before unhooking. These can be safety risks. This is especially serious when moving items like ammunition between ships.

The control of marine cranes is important to military and civilian projects worldwide. Studying how to control this complex system under special disturbances is also valuable for theory and practice.

Control of marine cranes mainly includes two parts: vertical control to reduce ship motion effect and horizontal control to reduce load swing. For vertical control, a common method is to connect the crane ship to the receiver ship with a mechanical system. This system senses the motion between the two ships and adjusts the rope length to match the heaving movement. This compensates for the motion between ships and helps move the load up and down safely. But this method needs special mechanical structures and has limits on load weight.

A marine crane includes a boom device, which consists of the boom, mast, ropes, and winch. Boom devices are traditional cargo equipment on ships. Although they use many ropes and are complicated to use, they are still common because they are simple to make and low cost.

There are two ways to use a boom device: single boom operation and double boom operation. In single boom operation, one boom is used to move goods. The boom lifts the load, and then ropes are pulled to swing the load outboard or to the hatch. Then the load is lowered, and the boom returns. This is repeated. This method is inefficient and labor-intensive. In double boom operation, two booms are used—one over the hatch, one outboard—both fixed in place with ropes. The hoist ropes of both booms connect to one hook. By winding and unwinding the ropes, goods are moved between the ship and the dock. This is more efficient and less tiring than single boom operation.

Later, improved boom devices were developed, such as the double-span rope boom device and the Ebel boom device. The double-span rope device is improved from single boom operation. It has a hoist rope and two sets of span ropes. The boom is controlled by one hoist winch and two span winches. It is easy to use and efficient. The Ebel boom device is improved from double boom operation. It includes a hoist winch, span winches, and slewing winches. Winches can quickly position the boom. It can also lift and place loads at specific points within reach, which improves efficiency. This was an important step toward fully automated cargo handling.

Marine cranes are used on bulk carriers, container ships, tankers, and multi-purpose vessels. Examples include cargo cranes on bulk carriers and container ships, hose cranes on tankers, and deck cranes on multi-purpose ships. Unlike land cranes, marine cranes are installed on unstable ships. During operation, the ship may tilt or swing. The working environment is tough, with sea wind and saltwater corrosion. When not in use, they also face weather, waves, rolling, heaving, and impact during voyages.

Marine cranes come in many structural types, such as slewing type, traveling type, rope luffing type, cylinder luffing type, telescopic boom, folding boom, A-frame type, and combined type. They can be powered by electricity, electro-hydraulics, electro-pneumatics, diesel/gasoline engines, or manual force. The most common type is the electro-hydraulic crane used on bulk carriers for cargo handling.

The main structure of a marine crane includes a base column, tower, and boom, which are made of welded steel plates. The base column is welded to the ship structure and supports the crane’s weight. The top of the base has a slewing ring. The tower supports the crane. It is connected to the slewing ring below and hinged to the boom. The top has pulleys and wire ropes. Inside the tower is the machinery room. The operator’s cabin is at the front. The boom is a truss structure that carries the load.

The mechanisms of a marine crane include the hoisting, luffing, and slewing systems. The hoisting system uses a motor and gearbox to rotate a drum that winds the wire rope, moving the hook up and down. The luffing system uses a motor and gearbox to rotate a drum that winds the rope to change the boom angle and adjust the reach. The slewing system uses a motor and gearbox to drive a pinion that engages with the slewing ring gear, rotating the tower and boom. All three systems have brakes to ensure safe operation. Together, these systems move the load to the desired position.

The electrical system includes control components in an electrical box that form the control system. Operators use buttons and handles in the cabin to control the crane. The hydraulic system includes pumps, motors, valves, pipes, and accessories to control and drive the mechanisms. Marine cranes also have access ways and ventilation devices as auxiliary equipment.

Boom devices can be divided into two types: light and heavy. Light-duty booms have a capacity under 10 tons; heavy-duty booms are over 10 tons. Capacity depends on the ship’s use. General cargo ships usually have light booms with single boom capacity of 3–5 tons and double boom capacity of 1.5–3 tons. A 10,000-ton cargo ship may have a single boom capacity up to 10 tons and double boom capacity up to 5 tons. Modern multi-purpose ships that handle containers need booms that can lift at least a 20-foot container (20 tons). Heavy booms are used for large machinery and heavy goods. Most general cargo ships have 1–2 heavy booms with capacity from 10 to 60 tons, sometimes up to 150 or even 300 tons. A standard cargo ship usually has two light booms per cargo hold. Very large cargo ships may have four light booms per hold.