| 摘要 |
A retainer system, device and method are provided for retaining a severed pipe string such as a landing string suspended from a rig of a floating vessel or platform during a failure of a primary or secondary heave compensation system and prevent the severed pipe string from flying over the rig floor. The retainer system comprises a retainer device comprising a housing mounted to a platform or vessel, the housing defining a through bore for receiving a pipe string suspended from the platform or vessel. A safety sleeve extends through the housing. A stop arrangement is mountable on the pipe string, to permit engagement between the safety sleeve and the stop arrangement in order to limit relative movement between the housing and the pipe string in order to retain a severed pipe string in an emergency situation. Also provided is an emergency string tensioning system, a tensioning module and method of using the same for regulating the tension exerted on an object such as a pipe string suspended from a floating platform or vessel. The emergency string tensioning system provides a connection between an object and a structure, the emergency string tensioning system comprising one or more tensioning modules. Each tensioning module comprises a housing, a telescopic member extending from the housing and a telescopic arrangement mounted relative to the housing and operatively connected to the telescopic member, the telescopic arrangement comprising a first piston and first and second resistance arrangements. Upon relative movement between the telescopic member and the housing in a first direction the first piston is caused to move sequentially against the first and second resistance arrangements. |
