Old mast stress failure analysis
New mast stress loadings
miles away. The spotter has a huge responsibility on these boats
because it is from his skills, knowledge and keen eyes that the
next successful freight will come.
Rudolphs Ltd had been sub-contracted to Ship Repair New
Zealand and completed all the abrasive blasting and application
of 4,000 litres of Carboline coating systems. Their work included
the new mast and crow's nest, the underwater hull and topsides,
the #1 fishwell, as well as sections of the engine room, wet deck
and pipe alley.
The extensive hydraulics required to drive winches and the
various power blocks and haulers on the Carol Linda also
required a complete overhaul and modernisation with new
motors, winches and power block.
In talking with Phil Cattin from McRaes Global Hydraulics
Engineering Controls, he explained that once damage to the
vessel's hydraulic system was assessed post mast failure and
the options reviewed, the decision was made to install a new
"Load Sense Ringmain System" as this would provide both cost
and performance benefits over refurbishing the original "Fixed
Displacement" system.
Any option to reinstate the original system was going to be
hampered by new regulations that restricted the placement of
hydraulic lines or actuators over fishwells to avoid possible
contamination of product in the event of a component failure.
In contrast, the Ringmain System provided a very clean wet
deck overhead with no hydraulic hoses, minimal pipe work
and only three directional and two control valves in the entire
area, which as a result meant that the risk of component
279 Port Rd, Whangarei
Ph +64 9 438 0753 , Fax +64 9 438 0467
www.shiprepair.co.nz
VIP.S93
MARINE:
www.skipper.co.nz
September/October 2013 Professional Skipper 31
