| 摘要 |
1517546 Pipe laying CGDORIS (Compagnie Generale pour les Developpements Operationnels des Richesses sous Marines) 16 Sept 1975 [3 Oct 1974] 37951/75 Heading F2P A pipeline is transported by means of floats 3 and chains 5 mounted on the floats. The floats give the pipe positive buoyancy whilst the addition of the chains give the assembly a slight negative buoyancy. As the assembly floats to the bed of the water, part of the chains are supported by the bed so that an equilibrium position is obtained. When the destination for the pipe is reached hoops connecting the floats to the pipe are released by explosive bolts remotely operated, mechanical attachments operated by cables or by using divers. The floats and chains then float up for retrieval. |
