From compact shock absorbers to advanced heave compensation systems

Cranemaster® shock absorbers and heave compensators 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. For more than 30 years they have proven to be both effective and dependable.
For demanding operations we offer several solutions for enhanced performance and control. All control systems are designed with maximum focus on safety, and depending on system, they offer sensor redundancy, manual override and fail-safe modes. The computer based systems are DNV GL technology certified.
Cranemaster-unit-passive-heave-compensator-shock-absorber-offshore-installation-heavy-lift

Shock Absorbers & Passive Heave Compensators

Mounted between the hook and the load, Cranemaster® shock absorbers and PHC units expands your vessel capabilities and protects your crane, lifted object and personnel. The result is improved operational weather window, reduced probability of snap loads and reduced heave motion.
Passive heave compensators in series configuration for increased stroke

Connected in series for increased stroke.

Passive heave compensators in parallel configuration for increased load

Connected in parallel for increased load.

Cranemaster® Working Principle

  • Spring-damper system based on gas pressure and hydraulic fluid.
  • Self contained – no external connections of hoses or wires required.
  • Robust technology developed and produced in Norway.
  • May be equipped with High Performance Features
Cranemaster PHC Working Principle

Cranemaster® Adaptive Control — Adaptive change of settings during lifting

Subsea lifting operations typically have several phases, including lift-off, splash zone crossing, lowering and subsea landing. For optimal performance, each phase requires a different setup of the PHC unit. The Cranemaster® Adaptive Control (CMAC) system will give you optimized performance through automatic change of settings for the various phases. The adaptive functionality was used for the first time in the Gorgon project in 2013.

Quick Lift – Avoid re-contact after lift off

For cranes with a slow lifting speed, there may be a risk of re-contact between the structure and the barge. Using on-board Nitrogen pressure, the Quick Lift functionality will lift the load by pulling in the piston and thereby avoiding re-contact.

Lock & Release

The radio-controlled locking system will reduce rigging height by locking the piston in zero-stroke during over-boarding, avoiding the static stroke in air. The system may also be used to lock the piston subsea if required based on depth or ROV control.

Weight & Temperature Correction

Correction in air and water for temperature variations and variations in load weight and buoyancy. Deviations from calculated loads weigh does not influence performance.

Depth Compensation

Compensates for temperature variations and changes in buoyancy.

Advanced Splash Zone Tension mode (CAST)

The Cranemaster® Advanced Splash Zone Tension mode (CAST) changes the spring characteristics continuously during the stroke cycle, providing an optimized stiffness at each stroke position. This will give an enlarged operational weather window and the probability of slack slings and/or high DAF will be significantly reduced even for the most challenging objects.

CAST is particularly useful for objects with large horizontal surfaces (e.g. manifolds, templates and suction anchors) and objects with high buoyancy compared to weight (e.g. protection covers and mud mats).

Monitoring & Logging

Monitoring | ROV monitoring and control (e.g. piston lock subsea). System setup via radio or WiFi. Logging of forces, velocities, accelerations, pressures, stroke and temperatures for post-lift download and analysis.

Logging | Logging of all system data, sensor input, forces and movements during operation. Can be used to verify system performance, actual landing speed, splash zone forces etc.

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High performance features - offshore heavy lifting - active heave compensation - depth compensation

Cranemaster® Passive Depth Compensation

A common challenge when using Passive Heave Compensators in deep water, is the deep water pressure pushing the piston back in, resulting in reduced efficiency of the system. This can be solved by utilizing Cranemaster® Passive Depth Compensation (CMDC). This is a patented1), robust solution especially made for deep water operations. Stroke remains constant independent of depth and potential resonance during lowering is eliminated. The solution excels in its simplicity, there is no need for a control system.

1)InterMoore Inc., the owner of US patent 7934561 “Depth Compensated Subsea Passive Heave Compensator”, has granted Cranemaster an exclusive worldwide right for the use of this patent.

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Cranemaster-passive-heave-compensation-GoM

Active Heave Compensation

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Rental Fleet — Ready for immediate mobilization

Cranemaster have the world’s largest rental fleet of shock absorbers and passive heave compensators. Rapid response from quotation through to delivery ensures short lead times and on-time delivery.  Dimensions and weight for each unit is given in Product Datasheets and can be requested either through the Rental Fleet overview below or by contacting us. Our sales engineers are happy to help you find the best solution for your requirements.

CM3-1000T-4000

SWL:  1000 ton
Stroke length: 4000 mm

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CM3-700T-4500

SWL:  700 ton
Stroke length: 4500 mm

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CM3-600T-3000

SWL:  600 ton
Stroke length: 3000 mm

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CM3-500T-4500

Passive heave compensator shock absorber Cranemaster CM3-500T-4500

SWL:  500 ton
Stroke length: 4500 mm

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CM3-400T-4300

SWL:  400 ton
Stroke length: 4300 mm

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CM3-400T-4200

shock absorbers and passive heave compensators cranemaster CM3-400T-4200

SWL:  400 ton
Stroke length: 4200 mm

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CM3-400T-2500

shock absorbers and passive heave compensators cranemaster CM3-400T-2500

SWL:  400 ton
Stroke length: 2500 mm

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CM3-250T-4500

Passive heave compensator shock absorber Cranemaster CM3-250T-4500

SWL:  250 ton
Stroke length: 4500 mm

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CM3-250T-2500

shock absorbers and passive heave compensators cranemaster CM3-250T-2500

SWL:  250 ton
Stroke length: 2500 mm

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CM2-150T-4500

shock absorbers and passive heave compensators cranemaster CM2-150T-4500

SWL:  150 ton
Stroke length: 4500 mm

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CM2-150T-3000

shock absorbers and passive heave compensators cranemaster CM2-150T-3000

SWL:  150 ton
Stroke length: 3000 mm

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CM1-100T-2500

shock absorbers and passive heave compensators cranemaster CM1-100T-2500

SWL:  100 ton
Stroke length: 2500 mm

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CM1-100T-1000

Cranemaster shock absorber passive heave compensator

SWL:  100 ton
Stroke length: 1000 mm

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CM3-75T-4000

shock absorbers and passive heave compensators cranemaster CM3-75T-4000

SWL:  75 ton
Stroke length: 4000 mm

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CM3-50T-3500

shock absorbers and passive heave compensators cranemaster CM3-50T-3500

SWL:  50 ton
Stroke length: 3500 mm

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CM2-50T-3000

shock absorbers and passive heave compensators cranemaster CM2-50T-3000

SWL:  50 ton
Stroke length: 3000 mm

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CM3-25T-3000

SWL:  25 ton
Stroke length: 3000 mm

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CM1-25T-1000

shock absorbers and passive heave compensators cranemaster CM1-25T-1000

SWL:  25 ton
Stroke length: 1000 mm

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Let us help you find the right solution for your project

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