19
Aug

News

What is Active Heave Compensation?

Chronos AHC in production

Imagine an ordinary crane is lifting something to build your house on land.

The crane can lift the object and place it in another location. On land, nothing but the object moves. On the water, both the object and the crane move.

Traditional active heave compensation (AHC) uses a motion reference unit (MRU) to sense the motions of the vessel with the crane on it. The heave motion, vertical vessel motion, is measured and the AHC acts accordingly:

When the ship moves upwards ↑, the lifted object moves downwards ↓.

When the vessel moves downwards ↓ the lifted object moves upwards ↑.

With the Chronos hanging on a hook, any crane or winch can perform AHC operations, on land and offshore.

The AHC does so by either loosening or tightening the cable holding the object.

In the past, AHC units were directly attached to equipment categorizing it as either land or sea friendly.

Currently, a new generation of AHC products is on their way to the market. Safelink has developed the Chronos, a mobile, hook-based unit. With the Chronos hanging on a hook, any crane or winch can perform AHC operations, on land and offshore.

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