设计和操作条件的推导（第二版

[中文适用范围]： 本标准为石油和天然气工业中使用的各种类型海上结构的設計、建造和运行中气象和海洋学（Metocean）条件的确定和使用提供了通用要求。这些要求分为两大类：一类涉及一般环境条件的确定以及描述这些条件所需的Metocean参数；另一类涉及Metocean参数在海上结构的设计、建造活动或运行中的表征和使用。讨论的环境条件和Metocean参数包括：返回周期明显长于结构的设计使用寿命的Metocean参数的极端值和异常值；Metocean参数的长期分布，形式为累积、条件、边缘或联合统计；在设计使用寿命期间预期频繁发生的正常环境条件。Metocean参数适用于：新结构的设计作用确定；现有结构的作用评估；移动海上装置的场地特定评估；确定前服务和后服务情况（如制造、运输和安装，或拆除和移除结构）的极限环境条件、天气窗口、作用和作用效应；设施运行（如适用）。 [外文原描述]： This standard gives general requirements for the determination and use of meteorological and oceanographic (metocean) conditions for the design, construction and operation of offshore structures of all types used in the petroleum and natural gas industries. The requirements are divided into two broad types: — those that relate to the determination of environmental conditions in general, together with the metocean parameters that are required to adequately describe them; — those that relate to the characterization and use of metocean parameters for the design, the construction activities or the operation of offshore structures. The environmental conditions and metocean parameters discussed are: — extreme and abnormal values of metocean parameters that recur with given return periods that are considerably longer than the design service life of the structure, — long-term distributions of metocean parameters, in the form of cumulative, conditional, marginal or joint statistics of metoc