MacGregor Crane with Three-Axis Motion Compensation

MarineLink.com
Tuesday, May 07, 2013

MacGregor, part of Cargotec, developed an offshore crane featuring three-axis motion compensation to carry out installations, repairs, maintenance and general service duties in the renewable energy and oil and gas markets

A 74m infield support vessel (ISV) will debut a new MacGregor offshore crane that delivers full three-axis (x, y and z) compensation, enabling equipment to be landed on small, high platforms with little margin for error. Siem Moxie is under construction at Fjellstrand shipyard in Norway and will operate in the offshore renewable energy and oil and gas markets for Siem Offshore. The crane has a safe working load of five tons at a 25m outreach; delivery is scheduled for January 2014.

"Siem Offshore approached MacGregor's Competence Center for Advanced Load Handling, Offshore in Kristiansand, Norway, to develop the crane especially for the vessel," said Frode Grøvan, Director, Sales and Marketing, Advanced Load Handling.

One specific task for Siem Moxie will be to transfer equipment to the top of offshore windmill foundations to install power cables and other apparatus used for windmill installation and maintenance.

"The landing platforms are about 20m above the water and they are only 4m2, so precise load handling is essential," Mr. Grøvan said. "Although MacGregor's standard active heave compensation (AHC), supplied through a crane's winch, compensates for a vessel's vertical movements, a greater degree of precision was required in this case."

The crane, which has a hydraulically-tilting foundation, is mounted at the center point of the vessel. "Although all areas of the vessel experience the same angular movements in a seaway, positioning the crane at the center of the vessel minimizes the actual physical displacement of the crane and its load," Mr. Grøvan explained. "The tilting foundation compensates for pitch and roll, maintaining the crane pedestal vertical with respect to the sea bed; active heave compensation provides the third degree of stabilization."

A motion reference unit (MRU) will be the primary sensor for calculating heave motion. In addition, a secondary sensor placed at the crane boom tip will be used to verify the MRU's accuracy and provide overall redundancy, adding to the system's safety.

www.cargotec.com

 

Maritime Reporter August 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Offshore

Latest ShipConstructor Update Targets Offshore

With the release of ShipConstructor 2016 R1.1, SSI said it provides additional enhancement for the offshore rig construction market, particularly with regards to weld management.

MODEC FPSO Achieves First off Brazil

MODEC, Inc. announced today that its FPSO Cidade de Itaguai MV26, operating in the Iracema Norte area of Lula field, in the Pre-Salt layer of Santos Basin offshore Brazil,

AFBO to Provide Security in Arctic Waters

State of the Arctic Council to establish a new mechanism to strengthen operational cooperation and coordination of activities at sea. This is dictated by the

Energy

Nigeria Ramps up Push to Eradicate Oil Theft

Nigerian authorities hope to put an end to rampant oil theft in eight months by increasing drone and naval monitoring of territorial waters and working with local communities,

MN: Corvus Energy

The Company: Corvus is a manufacturer of proven, high power Energy Storage Systems (ESS). Its field proven battery systems provide power to hybrid and fully electric marine propulsion systems.

Brent Crude Falls More than 7 Percent

Brent crude futures tumbled more than 7 percent on Tuesday, falling back below $50 a barrel as data highlighting China's contracting manufacturing sector revived

Marine Equipment

Runaway Crane Barge Sinks on the Mississippi

The U.S. Coast Guard is working with a team of responders to recover a runaway crane barge that sunk near Convent on the Mississippi River.   The crane barge

MN: Corvus Energy

The Company: Corvus is a manufacturer of proven, high power Energy Storage Systems (ESS). Its field proven battery systems provide power to hybrid and fully electric marine propulsion systems.

Total Lubmarine Resumes Full Service in Tianjin

Marine lubricants and greases provider Total Lubmarine informs it has resumed all services based out of the Port of Tianjin following the deadly explosions that rocked the port August 12.

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Maritime Standards Naval Architecture Navigation Offshore Oil Ship Repair Shipbuilding / Vessel Construction Sonar
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1482 sec (7 req/sec)