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ABOVE:
The massive power block
LEFT:
The new skiff doing
bollard pull trials
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purse and super seiners, t k th next fl
d
i
took the
t flight to American Samoa
to work with the owners and insurers. Together they assessed
the damage and the best solution for repair was developed – this
required that the ship be relocated to New Zealand.
Before this could happen, and once Ship Repair New Zealand
had secured the project to undertake the repairs and replacement
of damaged items, Peter utilised Marine and Industrial Design
to carry out the failure analysis and design of the replacement
components through their existing partnering agreement.
The problem was that in the intervening 32 years since the
ship had been built, fishing technology had changed – nets
had become larger, loadings greater and the skiffs with greater
horsepower. Today, while the ships are built low, they can carry
large amounts of fuel and over 1,200 tonnes of fish in their brine
and freezer tanks, meaning that they maintain excellent stability
even when heavy pulls are exerted on the mast or boom.
Tuna are regarded as a high value catch, as fishermen have
little to do apart from cooling the catch to below minus 22
degrees centigrade in the brine tanks as quickly as possible, and
then pumping out the brine before it becomes one large 100
tonne block.
It is the process of finding the schools and surrounding them
with a huge purse seine net that is the secret to the tuna fishing
method. As vessels have become older, and along with the
potential loss of crew skills, it is easy to see that without an
experienced bosun and chief how this type of accident might
happen when huge loads are being exerted on the booms and
mast. Especially when everyone is focussed on securing the next
big catch.
To begin the repairs to Carol Linda, Marine and Industrial
Design created a model and calculations of the existing mast
from historical information available. This was done in order
to carry out a Finite Element Analysis to predict the failure
mode and loads on the mast. Calculations included linear stress
analysis and non-linear and buckling analysis, based on the
reports of the angles of operation at the time of failure, as well as
expected worst-case loading conditions. MID were then able to
create preliminary designs for the replacement mast and booms
to allow construction estimates for insurance purposes.
The next task was to carry out an initial inclining
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September/October 2013 Professional Skipper 29
