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发明授权
CN105705852B 海上管道铺设和管线废置方法 有权

海上管道铺设和管线废置方法
摘要：
用于从海上管道铺设船将管线安装至海底的方法，所述方法包括启动、管道铺设和管线废置。管线废置的实施方案包括：·‑停止管道铺设并且在一个或多个张紧装置下方的位置处将悬垂夹具(30)与管线接合，·‑将重量转移至悬垂夹具并且将入海管线保持在作业线中，·‑切断管线，·‑将启动缆绳(41)连接至被一个或多个张紧装置保持的管线的下端，·‑将管线张力转移至启动缆绳，·‑释放一个或多个张紧装置，使得在管线转向器(17)与启动缆绳之间的管线部段被保持在作业线中，·‑通过至少使管线转向器和启动缆绳滑轮两者移动并且因此使所述管线部段移动离开作业线从而腾出作业线，·‑将A&R缆绳(51)设置在作业线中，·‑将A&R缆绳连接至被保持在作业线中的入海管线的上端，·‑释放悬垂夹具，·‑操作A&R绞盘并且因此将管线降低至海底。
摘要（英）：

A method is provided for installing a pipeline on the seabed from a marine pipelaying vessel, including initiation, pipelaying, and abandonment of the pipeline. An embodiment of the abandonment of the pipeline includes halting pipelaying and engaging a hang-off clamp with the pipeline at a position below one or more tensioners, transferring the weight onto the hang-off clamp and holding the seagoing pipeline in the firing line, severing the pipeline, connecting the initiation cable to the lower end of the pipeline held by the one or more tensioners, transferring pipeline tension onto the initiation cable, releasing the one or more tensioners, so that a section of the pipeline is held in the firing line between the pipeline diverter and the initiation cable, vacating the firing line by at least displacing both the pipeline diverter and the initiation cable sheave and thereby displacing said section of the pipeline from the firing line, arranging the A&R cable in the firing line, connecting the A&R cable to the upper end of the seagoing pipeline held in the firing line, releasing the hang-off clamp, and operating the A&R winch and thereby lowering the pipeline onto the seabed.

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