In marine deck hydraulic systems, multiple actuators such as winches, cranes, hatch covers, steering gear, and locking mechanisms are often powered by a centralized hydraulic unit.
Hydraulic lines extend from the engine room to various locations across the deck, forming a long-piping, multi-circuit system.

Industry Context: Why Pulsation and Noise Become Critical

Unlike many industrial systems, marine deck hydraulics do not always operate at maximum pressure.
However, they are highly sensitive to flow and pressure stability.

Typical challenges include:

Long piping amplifies flow ripple into vibration and pressure fluctuation
Deck structures and bulkheads act as resonance surfaces, increasing noise levels
Pressure variation during simultaneous operations affects coordination between actuators

These factors make pulsation control a key design requirement.

Core Requirement: Stable Flow, Low Pulsation, Coordinated Motion

For marine applications, system performance depends on:

Smooth pressure and flow output
Reduced pulsation across long pipelines
Stable coordination between multiple hydraulic functions

This shifts the focus from maximum pressure capability to system stability and control.

Solution Platform: FG / FG21 Internal Gear Pumps

To address these challenges, more system designers are adopting FG / FG21 internal gear pumps as the main hydraulic power source.

Structural Advantages

Internal gear design inherently produces lower flow and pressure pulsation compared with conventional external gear pumps

Smooth output reduces vibration and noise transmission through long pipelines

Pressure and Speed Capabilities

Rated pressure: 31.5 MPa
Maximum pressure: up to 35 MPa
Speed range: 200–3000 r/min

These parameters fully support the requirements of deck machinery such as winches, cranes, and steering systems.

Multi-Circuit Configuration with FG21

FG21 dual pump configurations allow clearer separation of hydraulic circuits:

Steering gear
Winches
Hatch covers

This improves system coordination and reduces interference between functions.

Design Considerations for Marine Systems

During system design, engineers typically evaluate:

Maximum pressure requirements under worst-case conditions such as mooring, anchoring, and steering

Combined flow demand when multiple actuators operate simultaneously

Piping length, routing, and layout, which directly affect pulsation and pressure stability

Based on these factors, appropriate FG1 / FG2 displacement or FG21 combinations are selected.

Performance Improvements in Operation

In actual marine applications, several improvements are observed:

Reduced vibration around deck equipment
Lower and smoother noise levels in hydraulic rooms
More stable pressure readings during combined operations
Improved coordination between multiple actuators

These improvements contribute to both operational comfort and system reliability.

Engineering Value: Controlling Pulsation in Long-Piping Systems

In marine deck hydraulics, the key challenge is not only achieving sufficient pressure, but maintaining control over pulsation, noise, and motion coordination in complex systems.

FG / FG21 internal gear pumps provide:

Low pulsation output for long piping systems
Stable pressure and flow for coordinated operations
Reduced noise and vibration across deck structures
Flexible configuration for multi-circuit hydraulic systems

Summary

For marine deck hydraulic systems with long pipelines and multiple actuators, system stability is more critical than peak pressure.

By using FG / FG21 internal gear pumps, designers can achieve:

Reduced pulsation and vibration
Improved noise control
Better coordination between hydraulic functions
More reliable long-term system performance

This approach provides a stable and efficient hydraulic foundation for modern marine deck machinery.