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Winch and propulsion key to LNGC tug designs

机译：LNGC拖船设计的绞车和推进键

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摘要

Escort tug propulsion systems and the associated winch tension are used to slow oncoming LNG carriers down and then control their speed upon arrival at LNG terminals. Classification societies have 'escort' notations for these tugs, defining the winch components and towing apparatus. Winches used for escort tugs must have a fast rendering system in case of emergency and the tension to which the towline is subjected should be monitored. During their operation, all towing must be carried out over the winch; the drum brakes are not used, according to industry guidance. An escort tug works on the stern of the LNG carrier to generate retaining forces and steering operations, reducing speed to a constant of around six knots. The operational mode of the escort tug will follow the following phases: rendering and recovering the towline; controlling tension; and releasing it in an emergency. The distance between tug and ship and the towline tension should be maintained to pre-determined values. There are two methods of connecting a towline to an LNG carrier, depending on the ship operator and terminal owner: one involves using equipment and bollards on the ship deck; the other uses the shell, or sunken bitts on the LNG carriers hull.
机译：伴游拖线推进系统和相关的绞盘张力用于减速升起的液化天然气载体，然后在到达LNG端子时控制其速度。分类社会对这些拖船有“护送”符号，定义了绞车组件和拖曳设备。在紧急情况下，用于护送拖船的绞车必须具有快速的渲染系统，并且应监控拖曳线的张力。在他们的手术过程中，必须在绞车上进行所有牵引。根据行业的指导，不使用鼓刹车。护送拖船在液化天然气载波的船尾起作用，以产生固定力和转向操作，从而将速度降低至六节左右。护送拖船的操作模式将遵循以下阶段：渲染和恢复牵引线;控制张力;并在紧急情况下释放它。拖线和船舶之间的距离以及牵引张力应保持到预定的值。有两种方法可以将牵引线连接到液化天然气载体，具体取决于船舶操作员和终端所有者：一种涉及在船上使用设备和柱布;另一个在液化天然气载体船体上使用壳或凹凸不平。

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