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Mooring for Navigation Buoys

With increasing life time of navigation buoys, it is the wear of the mooring chain that mainly determines the service interval for these systems. Grinding by sand contributes substantially to this chain wear. The sand grains get between the chain links when the mooring line is slack, and do their damage when it is tightened again. The ongoing wave movement causes the mooring line to be alternately under tension and without tension. Although tides and currents distribute this wear somewhat over the chain, it is better to prevent this wear altogether. A way to reduce the grinding is by keeping the mooring line continuously tight, thus keeping the grains out of the link spacings. This is achieved by putting in an elastic cord in the mooring line.

Problem of shallow water
Designing an elastic cord mooring is a challenge especially in shallow water with a relatively large tidal amplitude. In these circumstances, the ratio of the maximum cord length – needed to keep the buoy visible at high tide – and the minimum cord length – needed to keep the line under tension at low tide – is very large. This large ratio constitutes a requirement on the maximum elongation of the elastic cord.

 

 

The specifications of the mooring lay-out differ from every specific situation.

Do you need extra information on mooring a navigation buoy?

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