Kasteelborg FF89278


In just twelve weeks Royal Niestern Sander converted the Platform Support Vessel Blue Queen into a Walk-to-Work (W2W) Emergency Response and Rescue Vessel (ERRV) for Wagenborg Offshore.

The ship, now named Kasteelborg, will be deployed in a similar manner as the Kroonborg: as a standby and support ship for inspection and maintenance of unmanned platforms on the Dutch and UK Continental Shelf.


The Blue Queen was built as a PX-121 at Ulstein Verft. Due to lack of work in the offshore, the ship was layed up. Ulstein proceeded to develop conversion plans for the PX-121 design to make te vessels suitable for different types of work.

In total, 30 PX-121 vessels have been built, so far 9 of which have been converted. Download the full list of PX-121 vessels, including information on where they were built and for who, here.

Read the full article on the Kasteelborg by our editor Gerrit de Boer in SWZ|Maritime's March issue (subscribers only).

Extra Footage

As promised in our March issue, you can find extra footage of the Kasteelborg here. The photo album below contains extra images (please click the pop-out link to view them in their proper dimensions. The video by Wagenborg gives more details of the conversion project.

Picture (top): The Kasteelborg at the NAM platform L09-FA on the Dutch Continental Shelf (by Flying Focus/Wagenborg).

Author: Mariska Buitendijk

Mariska Buitendijk is one of SWZ|Maritime's journalists as well as the magazine's copy editor.

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