Passive Heave Compensation (PHC)

Passive Heave Compensation is used on existing or new lifting devices to reduce dynamic load and/or increase payload. The payload motion can also be controlled and reduced.

In practice, PHC is mainly used in environments where the load is positioned on the seabed and in sea conditions where movement compensation is required.

The benefits of passive heave compensation systems include:

  • Enlarged operational weather window for offshore and subsea projects;
  • Improved efficiency, increased safety and extended component life;
  • No additional power supply;
  • Splash zone crossing to avoid slack wire problems and high dynamic loads;
  • Transfer lifts between two vessels or a vessel and a platform by increasing the crane’s capability to absorb wave energy;
  • Reduced landing speed for cranes without AHC systems;
  • Subsea retrieval of objects adhering to the seabed;
  • Avoids subsea resonance when the wire rope length increases and acts like a spring;
  • Load tensioning by decoupling the motion of a boom tip from a subsea structure on the seabed.

The related products and services include:

Passive Heave Compensation gallery