background image
 

Salvage

Raising of the St Enogat — Port of Cape Town

Scope of Work
  • Salvage by refloating and scrap the Stern trawler -"ST Enogat"
  • Lightweight 850 ton
Method

Anti-pollution booms placed around the vessel to serve the dual purpose of pollution control while demarcating the work area.

March 2007:
  • The St Enogat was a ship with far superior mass to that which we had seen before in the Southern Harrier.
Mid June 2007:
  • We went about the process of sealing off the vessel sufficiently to assist the harbour crane's 200 ton lifting capacity.
End July 2007:
  • Ongoing research and surveying of the wreck revealed evidence that the internal bulkheads and decks had either and often both, been tampered with to the extent of removing them in order to gain access to the internal chambers within the vessel or otherwise corroded away, ultimately causing the necessity for extensive repair work, in order to seal off the holds.
  • With the wreck having been sealed sufficiently to partially float, large amounts of debris were discovered, burying the stern section and restraining any attempts made by us to right the wreck, introducing the activity of dredging and clearing of obstructions deposited on the wreck.
End August 2007:
  • Due to the combination of the weakness of the gunwales, the excess weight of the wreck and an excess of deposited debris in and around the wreck, causing a cradle effect, it proved impossible to right the wreck using lift-bags alone and it became necessary to request the use of a port tug to enable a more controlled pull in rolling the wreck upright.
End October 2007:
  • After repeated structural failure, repairing and re-sealing and re-testing, to an extent that allowed sufficient floating, it was observed that due to the stripping and removal of the heavy internal components of the vessel, that there was a tendency for the vessel become unstable and overturn during dewatering.
  • The target of sealing off the factory area was moved, to sealing off of the entire accommodation by extensive reconstruction of the internal bulkheads, decks and doors and portside gunwale.
  • Structural weakness of these specific areas required repeated partial testing of the repairs, with the use of the harbour crane or a port tug. This to prevent the wreck from rolling over once dewatering began or to heave the unstable vessel away from the quay wall.
  • Quayside winches where installed to haul and maintain the vessel in the upright position.
7 March 2008:
  • Concrete was placed in reconstruction of the accommodation floors.
  • Controlled input of compressed air using a 900cfm compressor was used to pump air into selected sealed compartments. 9 x 6inch sludge pumps were used to dewater.
  • After testing, rebuilding and re-testing, we were able to float the vessel upright and tie her up alongside.
7 March to 6 June 2008:
  • Pumping off of mud and water to maintain the vessel afloat.
  • Vessel monitoring to protect from re-sinking.
  • Breaking up at quayside and syncro-lift.