PSI Hydraulic manufactures Ship Transfer Systems (STS) for shipyards and dry docks, designed to move ship hull sections with a total system capacity of up to 40000 tons. The system is based on 4–120 self-propelled marine trolleys, each rated for up to 320 tons, allowing flexible configuration for shipyard heavy transport and modular block movement.
A centralized hydraulic power unit (HPU) with diesel generator supplies synchronized power to all lifting cylinders and drive motors. Load-sensing control enables precise regulation of speed and force, with controlled movement from 0.01 to 2.0 m/min. PSI STS platforms support hydraulic self-powered transfer systems and electro-mechanical transfer system elements for reliable operation in saltwater-exposed and low-temperature dockyard environments.
PSI ship transfer systems are developed as fully synchronized hydraulic transport platforms, capable of moving extremely heavy structures with millimeter-level control. A typical STS configuration consists of 4 to 24 self-propelled marine trolleys, with the option to connect additional units depending on operational requirements.
At the core of the system is a centralized hydraulic power unit (HPU), supplying energy and control to all transport modules in real time.
The hydraulic power unit is built on a reinforced steel frame housing:
The HPU is engineered for dockyard and dry dock operations, operating reliably under saltwater exposure, rain, and low ambient temperatures. All structural elements are protected with marine-grade coatings, while critical components are enclosed within sealed panels.
Load-Sensing hydraulic technology allows power consumption to vary from 5% to 100%, enabling the operator to precisely control:
This ensures energy efficiency and smooth operation even during complex modular block transport.
Each trolley is equipped with a heavy-duty hydraulic lifting jack, designed for high-pressure operation up to 350 bar. These cylinders are manufactured using corrosion-resistant materials and advanced sealing systems suitable for:
Integrated linear displacement sensors provide real-time feedback, enabling synchronized hydraulic system operation across up to 100 lifting points. The system continuously monitors load distribution and stroke position, ensuring safe and uniform lifting of large hull structures.
Each self-propelled trolley is powered by a radial-piston hydraulic motor, offering high torque at low speeds. This configuration allows:
The system supports track-based hose carrier solutions, maintaining organized hydraulic and electrical connections during movement.
PSI STS platforms utilize advanced automation and remote control transport systems, allowing operators to manage:
The control system can automatically evaluate cargo position by analyzing pressure data across trolley groups, significantly improving safety during shipyard heavy transport operations.
Given the sensitivity of precision hydraulic components, PSI integrates a multi-level oil protection strategy:
This ensures long service life and stable performance even in harsh maritime environments.
To ensure safe industrial heavy equipment transport, each STS platform incorporates:
These features make PSI solutions ideal for heavy machinery movement platforms, large vessel blocks, and complex dockyard logistics.