Multi-purpose offshore support vessel conversion

HAM 602

In 2006 the Dutch dredge contractor Van Oord signed a contract with Arab Heavy Industries for the conversion of the multi-purpose offshore support vessel ’HAM 602’ into a side stone dumping vessel. The ’HAM 602’ was built in 1969 as ’Libra’, specially to install heavy concrete cubes for the Europoort [Hook of Holland] breakwaters. In 1982 the vessel was converted into a side stone dumping vessel, to take part in the construction of Eastern Scheldt Storm Surge Barrier. Finally in 1995, she was converted into a multi-purpose offshore support vessel and active in a wide variety of operations. For a special project, she started her second life as side stone dumping vessel.

Main particulars


Length overall

82.08 m

Length between perpendiculars

75.00 m

Breadth moulded

20.20 m

Moulded depth

6.30 m


4.80 m



In general, the conversion into side stone dumping vessel included the following:

  • Removal of the existing raised work deck
  • Construction of a new stone carrying deck
  • Construction of separation walls
  • Construction of dozer blades
  • Construction of side doors
  • Anti-heeling system
  • Protection structure in way of Voith Schneider propulsion units



Vuyk scope of work:

Arrangement drawings of:

  • General Arrangement
  • Shovels Arrangement
  • Container hydraulic power pack
  • Tank Arrangement

Construction drawings of:

  • Midship
  • Separation walls
  • Shovels
  • Side doors
  • Foundation anti-heeling pumps
  • Platforms & railings
  • Hatches    

Piping diagrams of:

  • Anti-heeling system
  • De-aeration system
  • Piping on Main Deck 

At last, Vuyk performed the inclining test at site after the conversion and prepared the preliminary stability booklet.


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