Passive Heave Compensation

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What is Passive Heave Compensation (PHC)?

A passive heave compensation device acts as a spring device with a predefined, relatively low stiffness. It allows relative motion while keeping load variations in wires, suspending the load within acceptable limits. Passive heave compensation systems normally require no power supply for their operation.

What is the difference between PHC and AHC?

Active Heave Compensation and Passive Heave Compensation

Passive Heave Compensators use a spring concept where Active Heave Compensators use a Motion Reference Unit. Next to that, another major difference between Passive Heave Compensators and Active Heave Compensators lies in power consumption. PHC does not consume external power while AHC requires an external power source.

When to use Passive Heave Compensation?

Typical areas of application are subsea operations where the load is situated on the seabed, the drill string compensators in riser systems and dredgers.