| 摘要 |
In a method of installing a storage tank 1 for petroleum products on the seabed, a liquid less dense than water (eg a light petroleum product) is used as ballast and is transferred to and from the tank via a loading buoy 23 connected to a tanker 26. Initially the tank 1 is completely filled with a light petroleum product, and air is simultaneously ventilated from the tank 1 which assumes a stable, floating position. Valves are opened in the bottom part of the tank 1 to admit seawater while the light fluid ballast is simultaneously transferred from the upper part of the tank back to the source 26 through conduit 24. Descent is controlled by devices 12, 14 until the skirts 2 of the tank penetrate the seabed 21. Further penetration is carried out by replacing the light fluid in the tank with seawater, and final penetration is effected by providing an underpressure in the volume delimited by the seabed 21, the skirts 5 and the bottom face of the tank. After installation, the buoy 23 and flow line 24 are used in the normal operation of the tank. <IMAGE> |
