/ ship salvage / helderberg
S.A. HELDERBERG - COLLISION AT SEA
The S.A. Helderberg expereinced a collision at sea,
whereby an Oil Tanker hit her on the stbd side oppoiste the engine
room, off Singapore in Feb 2007.
She was holed through the wing tanks, with controllable
water ingress into the engine room. The superstructure off the Mess
Room was also holed.
We were called in by the Salavage Company SVITZERWIJSMULLER
to design a cofferdam so as to isolate the engine room from further
water ingress, to allow the vessel to come into port and discharge,
before a full repair could be undertaken in dry dock.
The cofferdam was 15m wide and 11m high, designed
as an offset box structure with internal strengthening, (largely from
a Hotel Room in Singapore, with draughting support from back in SA).
The design accomodated divers operating inside. The tricky aspect
was that all three of the contact edges were on different curvatures,
hence the shape had to be accurate with little fabrication tolerance.
The cofferdam was built by PM COAST (S) PTE LTD in Singapore, and
transported by barge to the awaiting vessel.
The cofferdam was fitted by Svitzerwijsmuller.
The cofferdam, once seated and sealed, ended up giving
a total seal, and was considered a great success.
Triton Naval Architects
No. 8 Foregate Square,
Foreshore, Cape Town, SOUTH AFRICA
Tel: +27 21 418 2090 | Fax:
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By Triton Naval Architects