Marine Operations

Eide Marine Engineering BV, supports our clients in a wide range of Marine Operation Procedures and Documentation. If requested we can also offer a total package for the execution of the Marine Operation itself, in combination with Eide Marine Services AS.

Lifting operations

• Lifting arrangements
• Lifting equipment calculations
• Local and global strength analysis
• Pad-eye calculations
• Method statements

Marine transports

• Towing arrangements
• Motion analysis
• Sea fastening arrangements
• Verification of vessels and barges
• Design of reinforcements in objects and vessels
• Design of temporary structures

Removal offshore installations

• Ballast and stability analysis
• Method statements
• Structural capacity analysis
• Crane lift operations
• Onshore transfer
• Dismantling analysis

Global and local strength analysis for heavy lift operations

For the offshore windfarm Rødsand 2 and Sprogø, Eide Marine Services AS installed 90 gravity foundations.

The foundations are installed at waterdepth of 6 to 16m and weight up to 1800t.

The gravity foundations were loaded on barges, anchored in the proximity of the offshore windfarm. The floating crane Eide Barge 5 lifted off the foundations, sailed to the installation position and positioned the foundation within a high accuracy on a prepared gravel bed.

Eide Marine Engineering B.V have been closely involved for the:

• Design of the lifting gear to adopt to the various foundation lay-outs
• Foundation lifting procedures (dry and submerged)
• Crane barge mooring procedures during lift off and installation
• Client: joint venture Per Aarsleff A/S – Bilfinger
• Completed 2010

Eide Marine Engineering BV made for several lifting arrangements FEM checks. Strength checks for crane/jib structures, superstructures or both.

For Bohai Shipyard in Huludao (China), the lifting arrangement and strength of the accommodation block for our Eide Flex Unit was calculated  by Eide Marine Engineering BV

For Apply – Leirvik, an accommodation module is lifted with a tandem lift.
Due to lifting height restrictions a spreader beam can not be used for the Eide Lift 7.
The 2 jib tackles will have a large opposite longitudinal fleet angle which can result in excessive stresses in the crane structure.

Sea fastening of 36t Lemniscaat crane for Oldendorff

Eide Marine Engineering BV designed the sea fastening supporting structure for the safe transport of a Lemniscaat crane. The crane barge is to be transported on a heavy lift vessel from India to Trinidad.

The crane slew bearing is not capable to absorb the expected dynamic forces  during the marine transport. The crane is sea fastened such that the dynamic forces and moments acting at the slew bearing will be reduced within the limits.

Eide Marine Engineering BV calculated the sea fastening loads and designed the sea fastening structures for the safe transport of the 6 legged Jack-Up platform Karlissa A. The transport from Italy to Congo is performed with the submersible heavy lift barge: Eide Barge 28.

Because of limited crane capacity in the arrival area, the mud-pads and spud piles have to remain in place during transit. This requires a large air gap between asset and barge.

Eide Marine Engineering BV calculated sea fastening loads and sea fastening structures for several heavy lift transports.

Calculations are performed according the rules of Bureau Veritas, DNV, Noble Denton and US Tow manual.

Disposal Draugen FLP Loading Buoy for Scanmet AS

Eide Marine Engineering BV carried out the hydrostatic and structural analysis for the safe scrapping  process of the Draugen FLP (aprox 3560t displacement).

After lifting off the topside, the substructure is to be tilted in a horizontal position by means of pumping water ballast and an external crane lifting at the bottom of the FLP.

Analysis performed according DNV Marine Operations 2013 regulations and standards

Disposal Gullfaks SPM 1 & 2 – Loading Buoys for Scanmet AS

Two nearly identical loading buoys have to be scrapped in a safe and environmental friendly way. The total SPM is approx. 170m high and weights approx. 6050 tonne. The steel structure consist of a buoyant cylindrical column, 8m in diameter.

First the topside will be lifted off with a floating crane and than the substructure will be tilted to a horizontal position by means of pumping water ballast. After the fixed ballast is removed from the lower compartment afloat, the substructure will be dragged on a slipway for further scrapping.

Scope

• 3D Modelling (Inventor) for simulation purposes and weight + cog control
• Definition / estimation of weights and COG’s from existing documentation
• Hydrostatic analysis SPM during top side lifting
• Design pad-eyes for top side lifting
• Hydrostatic analysis tilting operations by means of pumping water ballast
• Analysis global strength and buckling substructure during tilting operation
• Hydrostatic analysis confirming safety during iron-ore removal afloat

Analysis are performed according Statoil requirements and DNV Marine operations and standards 2014