Jumbo Offshore Installs First Transition Piece

Friday, September 25, 2009
Photo courtesy Jumbo Offshore

Jumbo Offshore’s engineers and the crew of DP2-vessel Jumbo Javelin have successfully installed their first Transition Piece (TP), off the UK’s south-east coast. This is the first time that a TP has been transported and installed with only one DP2 vessel. The installation trial included leveling and grouting operations and even the removal of the TP. With a workability for critical lifts in wave heights up to at least Hs = 1.5m, Jumbo Offshore is now able to deliver various installation services for offshore wind farms.

After loading the 255 tonnes TP in Flushing, it was transported to the offshore location. There, the Jumbo Javelin positioned itself on DP next to the monopile and lifted the TP from her lower hold onto the monopile. After leveling the TP to its final position, the grouting procedure was tested.

To give crew safe access from the Jumbo Javelin to the installed TP as well as efficiently guiding the grout hoses, the Ampelmann II was used. This ship-based, self stabilizing platform actively compensates all vessel motions to make offshore access safe and easy. In 20 landings, a total of 72 transfers were made to and from the TP. Furthermore, the Ampelmann supported the grout hose. Access and support is possible in wave heights up to Hs = 2.5 m.

It was the first time that a TP was placed on a monopile from a free floating vessel on DP. The whole operation was completed in approximately 24 hours and was performed as planned with respect to every detail: transportation, installation, accessibility of the TP, grouting and, importantly, safety.

The Jumbo Javelin is able to carry 9 TP’s at a time, each with weights up to 300 tonnes. All the TP’s can be stowed vertically in the hold of the vessel and transported to the offshore location. The ship is free floating and uses its DP2 system to create, amongst others, a working environment in which TP’s can be installed in wave heights up to Hs = 1.5 m. With a high transit speed of up to 17 knots, the vessel is well-equipped for wind farm installation work.

Using a DP positioned heavy lift vessel compared to the conventional method of moving and installing TP’s brings advantages. One: the vessel is used for transporting a considerable load. Two: fast transit to the installation site and the installation itself. Three: the relocation from one position to the next is a relatively fast one, as the vessel does not need to reposition anchors or jack up and down again.

(www.jumbo-offshore.nl)

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

Offshore

Hercules Offshore Shares Fall 33%

Drilling contractor Hercules Offshore Inc's shares fell as much as 33 percent to a record low on Friday, a day after Deutsche Bank cut its price target on the company's stock to $0.

Brightoil Reports Steady Growth in Interim Results

Brightoil Petroleum (Holdings) Limited announced its interim results for the six months ended December 31, 2014, reporting steady growth over the period.   During the period,

Mexico Approves 5 Shallow Water Areas in Round One Oil Tender

Mexico has approved the terms for five shallow water areas containing around 355 million barrels of oil equivalent as part of its Round One tender to open up the country's oil fields,

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Maritime Standards Navigation Offshore Oil Pipelines Pod Propulsion Salvage Ship Simulators
rss | archive | history | articles | privacy | terms and conditions | 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: 0.1550 sec (6 req/sec)