Riser for great water depths
First Claim
1. A riser for great water depths comprising a main tube, said main tube having an axial natural period T1, several peripheral lines, each one of said peripheral lines having its own axial natural period Ti and said peripheral lines being held in position with respect to said main tube by fastening means, a base situated at the lower end of the tube characterized in that the lower end of each said peripheral lines is connected to a device placed on the base, said device being suited to allow a relative axial motion of at least one of said peripheral lines with respect to said main tube and in that the riser also comprises means for damping the axial motion.
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Abstract
A riser for great water depths includes a main tube, peripheral lines, and a base at the lower end of the main tube. The main tube has devices for holding the peripheral lines in position with respect to the main tube. The lower end of each of the peripheral lines is connected with another device placed on the base allowing axial relative movement of at least one of the peripheral lines with respect to the main tube. Also, the riser is provided with a damping device.
28 Citations
13 Claims
- 1. A riser for great water depths comprising a main tube, said main tube having an axial natural period T1, several peripheral lines, each one of said peripheral lines having its own axial natural period Ti and said peripheral lines being held in position with respect to said main tube by fastening means, a base situated at the lower end of the tube characterized in that the lower end of each said peripheral lines is connected to a device placed on the base, said device being suited to allow a relative axial motion of at least one of said peripheral lines with respect to said main tube and in that the riser also comprises means for damping the axial motion.
Specification