The owners of a 34,000 ton container vessel contacted Hydrex in order to
carry out a repair requiring an insert into the vessel's shell plating.
A crack had developed in the plating right next to the bulkhead and
this, of course, needed to be dealt with quickly before it became a
major problem. The insert that was needed was approximately 700mm x
300mm in size.
As Hydrex has the expertise and Lloyds' approval to carry out these
kinds of repairs whilst a vessel is afloat we were called upon to carry
out the work so we immediately dispatched a diving team to Panama where
the vessel was located.
Our first call was to a local company where an appropriate sized mobdock
was constructed to cover the area over the hull that needed replacement.
Once we were satisfied that the mobdock was to the standards required
and would be watertight whilst the plating was cut out it was
transported to the port.
A meeting with all appropriate staff was held. The sequence of work and
safety procedures were discussed and decided upon and the initial
internal inspection was done. The first step of the actual repair was to
fit mobdock underwater over the affected area. Once complete, our team
started to cut out a part of the bulkhead over the area where the
external plating had to be replaced. The defective hull plating
cropped out, corners rounded off.
Fitting of the insert in place was the following action and once this
had been positioned correctly the full penetration weld started from the
inside in accordance with Lloyds approved welding procedure. After it
had been completed the insert repair was checked using ultrasonic
testing and found to be without any defects.
The part of the bulkhead that had been removed was then replaced and
welded securely back in place, the mobdock removed from the hull and so
our customer was able to continue with normal operations with only a
short delay to schedule.