Koole Maritiem Removes Sunken Dredger from Harbour of Thorsminde, Denmark

Koole Maritiem Removes Sunken Dredger from Harbour of Thorsminde, Denmark

In the afternoon of the 21st of November of 2011, the dredger Helle Saj travelling through a dense fog, collided with her sister ship Tonne, just 400 meters off the harbour entrance of Thorsminde and sank. Although the ship was lost, fortunately there were no casualties. Koole Maritiem, just completing a salvage project in Sweden, was awarded the contract to remove the wrecked vessel, which was located inconveniently and partly blocking sea traffic coming to and from the harbour of Thorsminde.

Mobilisation

While supply-vessel Amy was sailing from Sweden to the site, barge Maxi left the port of Ijmuiden with all necessary equipment, including a newly acquired crawler crane and excavator. Both vessels arrived at Thorsminde at the end of March 2012 and operations commenced shortly after.

Preparing the removal

To simplify the removal, several chains, two excavators and one crawler crane were utilized to relocate the submerged wreck to a shallow location.

Although the dredger sank just four months before, the ship was already embedded significantly.

First pieces

Since the Helle Saj was equipped with an excavator, this object was removed first. So after its fatal dive, this was the first piece of metal to reach the surface again.

Weather conditions

All operations went according to plan, although bad weather conditions often prevented continuation. To ensure the safety of all staff, periods of inactivity had to be accepted.

Completion

Towards the end of April 2012 the last pieces of the vessel were recovered and placed on the barge. After completing this phase, a sonar survey confirmed a clean seabed and demobilisation commenced.

Helle Saj’s last voyage

The Maxi – carrying the remainders of Helle Saj – and the Amy returned in Amsterdam on the 22nd of April. All scrap was cut into smaller pieces and various materials were separated and forwarded to suitable yards.

Source: Koole Maritiem, May 9, 2012

 

Share this article

Follow World Maritime News

In Depth>

Events>

<< Feb 2016 >>
MTWTFSS
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 1 2 3 4 5 6

PUMPS & VALVES 2016

The 16th edition of PUMPS & VALVES in co-location with Maintenance, 20 and 21 April 2016 in Antwerp expo, will present a complete overview of all the technologies and innovations in the field of industrial pumps, valves and seals.

The exhibition will feature industrial pumps, control valves, valves, seals, filters and filtration, processing equipment, piping & pipelines, services for industry, governmental agencies & pipeline operators.

Pumps and Valves’ second duo edition, co-located with Maintenance, enjoyed a solid 8% increase in visitors with a total of 5.492 visitors.

read more >

FPSO Europe Congress

Why Attend the 2nd Annual FPSO Europe Congress?
Discover how FPSO leaders are embracing the new realities of a low oil price environment – what are the strategies to adopt in pursuit of viable economical FPSO projects?…

read more >

Port & Terminal Technology Conference & Exhibition 2016

MCI Media Limited are hosting the 8th International Port & Terminal Technology Conference & Exhibition in Charleston, SC.

This year, we are delighted to welcome South Carolina Ports Authority as official supporters.

Having established itself as a “must-attend” key industry event, Port & Terminal Technology will deliver an informative and technical conference programme complemented by an impressive line-up of industry experts.

Exploring the latest developments, issues, trends and technology affecting ports and terminals around the globe, the conference will provide delegates an invaluable learning opportunity as well as an excellent platform for discussion, debate and networking.

Port & Terminal Technology is specially designed for representatives from operations, maintenance and engineering from port authorities, terminal operators, consultancy firms, dredging contractors, maritime construction firms and suppliers of cargo handling equipment and those involved in the effective development and operation of container ports and terminals.

The conference is complemented by an intimate exhibition, comprising a select handful of elite market leaders, enabling companies to reach a niche target audience, showcase their products and network with potential, new and existing clients.

read more >

World Water Works 2016

Rising sea levels, ever-larger container ships, increased pressure on the accessibility of ports and waterways and the associated infrastructural requirements are all global problems.

The time is ripe for sustainable solutions which are both financially feasible and ecologically responsible.

Conference and exhibition

The two-day international hydraulic engineering conference and exhibition World Water Works on 23 and 24 March 2016 at Antwerp Expo brings together science, industry practices and trends related to:

– Hydraulic engineering
– Accessibility of ports and waterways
– Coastline and shoreline projects
– The construction of bridges, locks and tunnels
– Future offshore sea ports

read more >