| 摘要 |
Buoyancy unit for use on a riser for sub sea applications, particularly for great depths, with a clamp 11 to be tensioned around the riser 16 , and with a tensioning member 18 to damp the clamp 11 . Buoyancy bodies 26, 27 are provided to engage with the clamp 11 , said clamp 11 having at least one arched element 12 - 15 providing an annular structure to enclose the riser and to be pressed thereto with a tensioning strap 18 . The buoyancy bodies 26, 27 are attached to the arched segments, The clamp 11 is cast from of a concrete material where at least the outer shell or layer is provided to prevent the intrusion of water, the casting of the clamp preferably containing powdered aplite.
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