SARF 054
OUT QUOTE
for the Scottish industry, or whether a Scottish standard should be developed. It should be noted that there is now agree- ment that industry – through the Fresh Start Improved Containment working group – will develop a Scottish technical or engineering standard (a process which commenced in the winter of 2009). This is a key breakthrough and represents a major step forward for the industry that will serve to minimise escapes. A contractor has been appointed through SARF to develop the draft standard in conjunction with the industry. Following consultation on that standard, legislation will be required to ensure that standard is adopted universally by the industry in Scotland. An appropriate lead- in period is envisaged in order that the new standard can be reached as old equipment is replaced.
Although most fish farming companies and those in their supply chain have considerable experience and expertise in the specification of individual components, a number of escape incidents have been caused by component failure (including failure of moorings, cages, nets, lifting equipment and shackles). Mini- mum requirements for individual components related, where appropriate, to the exposure of sites proposed above should be provided in a Scottish Technical Standard.
A minimum ratio of 3:1 mooring length to
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water depth is typically considered desirable to absorb shock loadings on the cages through the catenary action of the mooring. Neverthe- less, there have been instances where the scope of the mooring leg has been reduced below 3:1 to fit within the extent of the li- censed area (specified by planning authorities and the Crown Estate) or because the farmer wishes to moor cages in a specific way. A reduced scope can be entirely adequate providing that the components are specified appropriately. Nevertheless, it is recommended that a reduced scope be avoided wherever possible, and the industry should engage with the Crown Estate and planners to ensure that they are aware of the concerns surrounding these issues.
Provision of documentation The person designing the moorings should be required to provide a specification which should include details of materials, compo- nents, dimensions and maintenance require- ments. The basis on which the installation is designed should be included, as should the return period and the identification of elements of redundancy.
Cage manufacturers should be required to provide instructions on the installation, mainte- nance and operation of their cage. This should include details on such issues as tolerances in
SITES NOT DESIGNED BY A MOORING PROFESSIONAL MAY BE
INAPPROPRIATE 29
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