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The Tower Sinking Process Seaflex buoyancy can also be used for the floating out and final positioning of Intake Towers on such projects. Typically large concrete structures of varying sizes but weighing up to 100 tons, these towers are often towed out and sunk into deeper water. The challenge is to as far as possible control the sinking process such that the tower will not plummet directly to the seabed, and such that the final position can be controlled for easy mating. For this type of application, two rows of Seaflex Fully Enclosed Single Attachment (FESA) bags have previously been fitted to such towers. Throughout the towing process, the tower is supported by a bottom tier of bags on relatively short strops. At the installation location, an upper tier of bags is inflated,these bags are attached to the tower via longer strops. The air is then vented from the lower tier of bags which causes the tower to sink down the water column until a few metres above the seabed – at which stage it is caught on the longer strops by the FESA bags at or near the surface. The tower can then easily be moved into final position before air is vented from the top tier of bags to see it sink into final position. Fig 4: Sinking of Intake Tower (note submerged lower tier of buoys as upper tier is inflated). www.uniquegroup.com 4PDF Image | Use of Buoyancy for Installation of HDPE
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