Cranemaster Technology and Development

Cranemasters are rugged self contained hydraulic/pneumatic units charged with an internal gas pressure and oil volume which is adjustable. There is no need for an external power supply. The hydraulic damping is controlled by nozzles, carefully designed to obtain optimal damping characteristics for a certain load range.

When preparing the Cranemaster for different lifts, there are two parameters that can be easily varied to adjust the characteristics of the unit:  the Pretension Pressure and the Oil Reserve Volume. You define at what point you want Cranemaster to stroke by adjusting the pretension pressure - defining the load you want the unit to start extending.  You vary the pretension pressure by changing the weight needed to extend the piston rod at the surface.

Increasing the reserve volume gives you a higher spring constant. This will make the unit less sensitive to load variations - needing increased load per length of stroke.

At Ernst-B. Johansen A.S. we work closely with our clients to develop new solutions, and to meet the increasingly complex demands from the offshore industry. Custom made units and solutions can be made if needed, and we appreciate to be involved in development projects.

Orcaflex simulations of lifting scenarios

We do in-house Orcaflex simulation and provide engineering support. In cases where our clients lifts need special consideration, we perform Orcaflex simulations to analyze the lifting system. Simulations are used to compare the situation with and without Cranemaster, which makes it possible to study and visualize the unit's performance.