Oil and Gas Archives - DUC Marine Group

Replacing oil pipeline

ducmarinegroup — Thu, 14 Jan 2016 16:29:53 +0000

REPLACING OIL PIPELINE

In Ashkelon, DUC Marine Group helped with the replacement of two 1500-m sections of pipeline. These oil pipes ran from a refinery to the sea where they were connected to a SPM (Single Point Mooring) buoy.

DUC was assigned the task of using PLIDCO clamps to connect the two new sections of pipe to the oil pipelines.

The four clamps were installed at a depth of 33 metres. This meant that there was limited diving time and a team of 13 divers and two decompression chambers were required to be able to work through the day.

After installing the PLIDCO clamps, they had to be welded with an ‘A height’ of 10 mm (eight beads of weld to make one weld!)

This was done in the dry in a habitat. Two divers entered the habitat at the same time to achieve a certified weld.

The project was concluded successfully, on time and within budget.

Categories: Civil Underwater Construction, Inshore, Offshore construction, Oil and Gas, Pipelines

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M.E.T. pile encapsulation

ducmarinegroup — Thu, 14 Jan 2016 15:29:48 +0000

M.E.T. Pile Encapsulation

Port of Rotterdam, The Netherlands

At the Maatschap Europoort Terminal (M.E.T.) in the 7th Petroleum harbour of Rotterdam, DUC Marinegroup together with Henskens B.V. cleaned the piles on which the sea mooring is built and preserved them both above and below the waterline.

This was done using a company-developed robot jet. This robot is first suspended and then used to clean the piles (using a water jet) both above and below the waterline. A polyester jacket is then wrapped around the pile and sealed. From below, this jacket is flushed out and then injected with two-component epoxy resin.

Categories: Cathodic Protection, Civil Underwater Construction, Inshore, Maintenance and Repairs, Oil and Gas, Preservation

Watch the video:

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Installation of a single-point buoy

ducmarinegroup — Tue, 22 Dec 2015 08:22:51 +0000

INSTALLATION OF A SINGLE-POINT MOORING (SPM) BUOY IN ROMANIA

Early June 2008, the workship RAM departed to the Black Sea in Romania for a major job for Van Oord Offshore. The RAM travelled via the Rhine, the Main Danube canal and then the Danube to arrive in the port of Midia, where the Rompetrol oil company has a large refinery. An SPM buoy had to be installed 8 km off the coast to make it possible to receive large cargoes.

The job was a follow-up to the work done with Van Oord in 2007, where assistance was given during the installation of, and subsequent coating repairs to, the Workum – Medemblik gas pipeline (using a habitat).

Before the six anchors to which the buoy is moored could be installed, 8 km of approximately 800-mm diameter pipe was to be installed using a large pipe layer.
The DUC divers performed regular inspections of the ‘touch down’ locations, the pipe trench and the position of the new pipeline.
In the meantime, the RAM was used in the port as a crane ship for the assembly of the SPM buoy and the Pipe Line End Manifold (PLEM) that forms the connection between the pipeline on the seabed and the subsea hoses that are attached to the buoy.

The connection of the PLEM to the pipeline and the connection of the hoses to the buoy were made at a depth of 27 metres. For this reason, we chose to use our own Nitrox systems.

After the connections were made, all of the attachment bolts were tightened using a “Hydratight” system.
The diving activities were completed in November, after which the RAM remained at the site to perform various tests. The activities for DUC Marinegroup were completed in January 2009, including all of the tests. The main activities that DUC was involved in for this project were the use of our workship the RAM, the execution of all of the diving activities, including the dimensioning and installation of the spool piece, hydratightening, inspections, the connection of the hoses between the PLEM and the buoy, etc.

Categories: Offshore, Offshore Construction and Installation, Oil and Gas

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