CASE STUDIES
CONTAINMENT SPECIAL
CASE STUDY - 3 REDUNDANCY
SITUATION: HURRICANE DAMAGE INCIDENT: ANCHOR FAILURE RESPONSE: STRONGER MOORING
The situation
Redundancy – it’s a term which we’re hearing all the more at the moment. But, in terms of containment, we’re talking about engineering redundancy – the dupli- cation of equipment or increase in speci- fi cation to prevent total failure should a single component fail.
This incident occurred on the infamous night of 11th January 2005 – when a dev- astating hurricane wreaked havoc across the Scottish west coast and islands.
The incident
The site in question was farming 70m circular cages. After the storm had died down, the site was found on the shore about one mile from its mooring area. A considerable number of fi sh had escaped. A review of the equipment after the event suggests that initially one anchor dragged. This would have put additional strain on to the next anchor and it is thought that this too dragged. And then the next anchor and then the next, as the increasing strain was held by an ever decreasing number of anchors until the whole site moved.
The mooring grid itself was intact as were the bridles. However, the anchors and mooring chains were damaged, some se- verely.
THE RESPONSE
Building in redundancy means designing so that, should one component fail – in this case an anchor – the strain can be taken by the next one.
The whole specification of this site has since been increased to help reduce the likeli- hood of a similar incident in the future. The company also highlighted the importance of maintenance and inspection routines to en- sure that equipment remains in good condi- tion and that any potential issues are ad- dressed well before they become a problem. In Scotland – we’ve also seen increased use of a double mooring line in the centre mooring when pens are moored in parallel, thereby doubling up and hence building in redundancy.
Effective feeding with full control
Feed barges
Central feeding
Monitoring
Orbit GMT delivers feed barges produced in steel. Our feed barges range from 150 to 440 tonnes capacity.
www.orbitgmt.com 36
www.fishfarmer-magazine.com
Spreaders
Control room
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