Motion compensated crane - BM-T40

The Barge Master Motion Compensated Crane enables controlled lifting operations with a high crane capacity, making it possible to work at sea almost year-round. It has proven to increase workability in the North Sea from 180 to 330 days.

The Barge Master Crane is designed for maintenance support vessels and platform supply vessels. It ensures safe lifting operations for all headings in higher sea states. The motion is compensated at the basis of the crane, ensuring a steady operator cabin as well as a steady load.

The crane features a small footprint and is able to lift 32 metres above sea level at a reach of up to 20 metres or 15 tonnes at a reach of 10 metres. In addition to its lifting capacity, the crane is also manriding certified for safe personnel transfer.

Typical loads include hoses, tools, spare parts, maintenance equipment, replacement parts of small wind turbines and solar panels weighing 1.5mT to 5mT. The Barge Master Crane is also perfectly suited for grouting operations.

BM-T40 spec sheet


BM-T40 "Just like lifting onshore" W2W Project - The 'KROONBORG' documentary BM-T40 specifications animation


Crane capacity

Crane lifting height (from deck)                                                          
15 mT at 10 m
5 mT at 20 m
35 m

Wave height
Wave period   
Heave, roll and pitch motions                                               
Onboard lifting functionality
EN13852-1 manriding certified
Hs 0 - 3 m
4 - 18 s

Platform height (retracted)
4.8 m x 3.7 m
8.3 m

Barge Master
Crane (typical weight)
85 mT
34 mT
35 mT

Lloyd's Register Certified Lifting Appliance
Barge Master T40 lifting load chart


The application of the BM-T40 increases the workability of a vessel significantly, as depicted by the images on this page. These images show the operational envelope for a typical offshore support vessel equipped with the BM-T40. For various wave headings the operational envelope increases up to significant wave height of 3 meters.

The BM-T40 ensures safe lifting operations for all headings in higher sea states. By compensating at the basis of the crane, the crane and load are compensated, ensuring a steady operator cabin/boom, as well as a steady load.


The Barge Master T40 motion compensation system is built in a pedestal type configuration. The motion compensation system consists of three vertically mounted hydraulic cylinders which compensate the heave, roll and pitch motions of the vessel. The constraining system consists of a linear guide mechanism and a mechanical joint between the base and the pedestal.

The roll and pitch motions of the vessel are compensated by two vertically mounted hydraulic cylinders which compensate the motions around a hinge between the pedestal and the base. The cylinders are attached to the outer pedestal and keep the outer pedestal in a vertical position; the outer pedestal is roll and pitch compensated.

The heave motion is compensated by a third hydraulic cylinder inside the pedestal. This cylinder compensates the heave motion by extending the inner pedestal through the outer pedestal. The inner pedestal is guided through the outer pedestal by means of a linear guiding mechanism consisting of a set of rollers. The linear guide keeps the inner pedestal upright, while allowing freedom in the vertical direction. The crane is mounted to the inner pedestal, making it roll, pitch and heave compensated.

The controller measures the motions of the vessel using motion reference units. The cylinders are controlled by means of velocity feed-forward and position feedback. Redundancy is applied to the critical components assuring safe motion compensated offshore lifting.

Compensated (Left) and constrained (Right) motions

Sales & Rental

The BM-T40 can be rented or purchased. The system can be integrated into a new vessel or retrofitted to an existing vessel. The BM-T40 has a small footprint allowing any vessel to easily accommodate the motion compensated crane.

Interested in purchasing or renting a BM-T40 system? Get in touch with us

Barge Master