本规范规定了处理3lpe涂层管上的补口和损坏区域，以及使用Acothane作为外部防护系统时的要求。

This specification describes the requirements for preparing field joints and damaged areas on 3 Layer polyethylene coated pipes, and the application of Acothane as an external protective system.

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在区域法中，系统被分为表面区和气体区，其数目与计算结果的精度要求和计算时间有关。

In the zone method, the system is divided into surface zones and gas zones, the number being dependent on the desired accuracy of the result and calculation time.

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根据动力定位自动区域保持控制系统的要求，设计了多种控制方案，以能量为指标函数进行比较。

To meet the need of dynamic positioning auto area keeping control, several control plans were proposed, and energy cost was considered as the most important factor in appraising the control result.

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