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Products & Services2018-12-28T21:26:07+01:00

Products & Services

Cranemaster® Units

View our broad range of shock absorbers and passive heave compensators.

High Performance Features

Advanced features for enhanced performance and control.

Monitoring & Logging

Get full control of system data, sensor input, forces and movements.

Lift Analysis

Lift analysis of movements, velocities and forces in crane/winch and load for various wave conditions.

Handling & Rigging

Up-ending frames, shackle options and unique solution for rigging height reduction.

Offshore Assistance

Assistance during operations, help with mobilization and training of on-board technicians.

Cranemaster® Units

Cranemaster® shock absorbers and passive heave compensators enables significant improvements in operability and expansion of weather window for offshore lifting operations. The Cranemaster® units are robust, reliable and easy to use. The units are designed to reduce impacts in offshore lifts above sea level, through the splash zone and subsea, and they will reduce resonance effects in deep water lifting operations.

Cranemaster® units have been in use for more than 30 years and have proven to be both effective and dependable. The units require a minimum of maintenance and deck space.

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Cranemaster shock absorbers and PHC for offshore lifting operations - passive heave compensators
Cranemaster high performance features shock absorbers and PHC for offshore lifting operations - adaptive passive heave compensators

High Performance Features

Innovation and continous product development is at the heart of our philosophy, and for demanding operations, we have Cranemaster® units with improved performance and additional functionality.

Enhanced performance and control

  • Cranemaster® Adaptive Control (CMAC) | Optimized performance through automatic change of settings for the various phases during lifting operation.
  • Cranemaster® Depth Compensation (CMDC) | For deep water operations, stroke will remain constant independent of depth.
  • Lock & Release | Reduction of rigging height through piston locking.
  • Quick Lift | Enables a load to be quickly lifted off  the deck of a vessel to prevent re-contact of load with deck due to vessel heeling.
  • Cranemaster® Advanced Splash Zone Tension (CAST) | Superior performance for splash zone crossing of demanding payloads.
  • Automatic stroke adjustments for temperature, weight and buoyancy correction.
  • Monitoring and logging.
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Monitoring & Logging


  • System setup via radio or WiFi.
  • Control by professional radio control.


  • Monitoring of system parameters, sensor input, status, forces and movements.
  • Monitoring in air via WiFi.
  • Optional monitoring in water via acoustic modem (HiPap).


  • Logging of all system data, sensor input, and forces and movements during operation. Can be used to verify system performance, actual landing speed, splash zone forces etc.
Load chart improvement lift analysis cranemaster

Lift Analysis

Our competent engineering team is eager to solve any challenge you may have related to dynamics or motions, using our existing technology or through development of tailor made solutions.

Typically this includes force analysis in crane/wire/load during lifts in air or through the splash zone, operational weather window calculations, subsea landing speed analysis or review of the above based on analysis received from the customer.

Levels of lift engineering

  • Feasibility study. Uses all available information about the lift and the application to determine the eventual operational benefit of using Cranemaster®.
  • Lift analysis – normal level. Simulation results and weather window using methodology in accordance with DNV RP-H103.
  • Lift analysis – extensive level. Full extreme value statistical analysis of the lifting operation.

Handling & Rigging

Up-ending frames

The larger Cranemaster® units are equipped with up/down-ending frames to ease the deck handling process. We have various frame versions, depending on client preferences.

Shackle selection

Most of our units can be equipped with wide body shackles or heavy duty shackles. Wide body shackles are well suited for connection of synthetic slings or grommets where higher bending radius is required.

Piston locking

Most of our CM3 units may be equipped with Lock & Release, a radio-controlled locking system to reduce rigging height. By locking the piston in 0-stroke position during over-boarding, the impact of the static stroke in air on rigging height is eliminated.


Offshore Assistance

If you need assistance, our service technicians, all with offshore experience and certificates, can assist you. Typical examples of services are help with mobilization prior to departure, training of on-board technicians and assistance during operation at sea. The larger Cranemaster® units are equipped with up/down-ending frames to ease the deck handling process.

Frequently Asked Questions

Will a Cranemaster® unit have any effect on peak loads for lifts in air?2019-01-03T08:39:26+01:00

Yes, utilization of a Cranemaster® unit will have an effect on peak loads for lifts in air. When there is relative motion between a lifted object and the boom tip, a snap load will occur. As a consequence, the dynamic amplification factor (DAF) will increase and potentially lead to unacceptable high peak loads. A Cranemaster® unit will work as a shock absorber, efficiently removing these snap loads, and as a result reduce DAF and improve safety. Typically, this will enable you to conduct such lifts in higher sea states, and thereby increasing the operational weather window.

Will Cranemaster® reduce motion in air?2018-12-28T19:33:51+01:00

No, as passive Cranemaster® units rely on external forces to reduce motion, it will have no impact on the movements of free hanging objects in air.

What is the difference between Active Heave Compensation (AHC) and Passive Heave Compensation (PHC)?2018-12-28T19:51:02+01:00

Both Active Heave Compensation (AHC) and Passive Heave Compensation (PHC) are techniques used on lifting equipment to reduce the influence of waves upon offshore operations. AHC differs from PHC by having a control system that actively compensates for any movement using external energy. Passive systems reacts to external forces without additional energy to control the motion. 

Can Cranemaster® units be used together with AHC?2018-12-28T19:52:04+01:00

Yes, Cranemaster® units will work perfectly together with AHC that responds to inputs from an accelerometer.

Can Cranemaster® be used to reduce dynamic hook loads when lifting through the splash zone?2018-12-28T19:52:47+01:00

Yes, the Cranemaster® is designed to instantly respond to its surroundings, take up slack wire and reduce dynamic loads.

What is the deepest operating depth for the Cranemaster® units?2018-12-28T19:53:39+01:00

As of today Cranemaster® has been used at 2700 meters water depth and is designed to operate down to 3000 meters. However, for deep water operations special depth compensation techniques may be required.

Let us help you find the right solution for your project