Marine & Offshore



Locatie Scheepswerf de Schroef Sluiskill

The rebuild of the DN 31 is a project that fits Croon like a glove. Fast, flexible and creative project management, engineering and execution are just a few of the requirements. Ultimately we fulfilled the demands of Jan de Nul.

Jan de Nul

The DN 31 is a permanent standby vessel for oil recovery in case of shipping accidents on the River Schelde or off the Belgian coast. During normal activities, the vessel is used with an underwater plough for seabed levelling in confined areas such as accesses to locks and near quay walls. The ship capsized after a collision with a tanker. It was recovered and refurbished at the De Schroef shipyard in the Netherlands.

The vessel is owned by Jan de Nul. The Jan de Nul group ranks at the top of the international dredging and marine-related industry and specialises in services for the offshore oil and gas industry, civil engineering and environmental developments.

Scope of Deliveries

Croon managed, engineered, integrated, installed and commissioned the following systems:

  •  High and low voltage systems, switchgear, distribution panels and
  •  power management system
  •  Transformers
  •  Alarm monitoring system
  •  Navigation and external communication system
  •  Telephone, general alarm system
  •  Control desks
  •  Fire detection system
  •  Complete cabling
Main data
Name Dn 31
Type of Vessel Oil Recovery Vessel, Underwater Plough
Rebuilt in 2011
Length overall 32.63
Oil recovery beams 2 x 13 m