| 摘要 |
In a stabilising system on a semi- submersible heavy lift crane vessel water ballast tanks are arranged above and below the waterline (A1, B1 and A2, B2) and the flow of water ballast is selectively controlled by valves 16, 17, 21, 22 in response to the unbalancing forces during the handling of loads. The regulating valves 21, 22 of the underwater ballast tanks A2, B2 are water inlet valves which are operable to open and close these tanks to the sea. <IMAGE> |
