(19)

(11)

EP 2 512 911 A1

(12)

(43) Date of publication: 24.10.2012 Bulletin 2012/43 (21) Application number: 10837064.4 (22) Date of filing: 26.11.2010

(51) International Patent Classification (IPC):  B63B 21/50(2006.01) (86) International application number: PCT/DK2010/050323 (87) International publication number: WO 2011/072687 (23.06.2011 Gazette 2011/25)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 16.12.2009 DK 200901333 (71) Applicant: National Oilwell Varco Denmark I/S 2605 Brøndby (DK)	(72) Inventor: CHRISTENSEN, Claus Dencker DK-2620 Albertslund (DK) (74) Representative: Hegner, Anette  Hegner & Partners A/S Banemarksvej 50 2605 Brøndby 2605 Brøndby (DK)