ISO 19905-3规定了石油和天然气工业中使用的移动式浮式装置的现场特定评估要求和指南。它涉及在特定地点安装有人非疏散、有人疏散和无人移动漂浮装置的阶段。ISO 19905-3规定了单体船（如船形船舶或驳船）、柱稳定式（通常称为半潜式）或其他船型（如圆柱形\/锥形）的移动式浮式装置。不适用于张力腿平台。定位可由系泊系统、助推器辅助系泊系统或动态定位提供。该装置的功能可以很广泛，包括钻井、漂浮、投标协助等。在生产碳氢化合物的情况下，可能会有其他要求。ISO 19905-3的要求适用于所有类型移动装置的船体和定位系统。可修改活动特定操作指南文件要求，使其适合所评估的情况。ISO 19905-3并没有考虑所有的现场因素，某些特定位置可能需要额外的评估。ISO 19905-3仅适用于结构良好且维护充分的移动式浮式装置，通常通过持有有效的RCS分类证书来证明。ISO 19905-3不涉及设计、现场往返运输或现场安装和拆除。ISO 19905-3规定了现场特定评估的要求，但通常依赖于其他文件提供评估如何进行的详细信息。一般来说:-站务系统评价参照ISO 19901-7；-参照ISO 19904-1确定海洋气象对该单元的作用；-ISO 19906适用于北极和寒冷地区；-船体结构和气隙的评估是通过对特定于现场的海洋气象条件和其设计条件进行比较，如RCS批准的操作手册所述；-移动式浮式钻井装置海洋钻井隔水管的评价参照了ISO 13624-1和ISO\/TR 13624-2[1]。可采用同等的替代方法；-IMCA M 220[5]是为制定特定活动的操作指南而参考的。可以使用商定的替代方法。注1:ISO 19904-1的范围特别规定，其要求不适用于移动装置，但可使用评估海洋气象行动的方法。注2:RCS规则和IMO MODU规范[4]为移动式浮式装置的设计和一般操作提供了指导。

ISO 19905-3 specifies requirements and gives guidance for the site-specific assessment of mobile floating units for use in the petroleum and natural gas industries. It addresses the installed phase, at a specific site, of manned non-evacuated, manned evacuated and unmanned mobile floating units. ISO 19905-3 addresses mobile floating units that are monohull (e.g. ship-shaped vessels or barges); column-stabilized, commonly referred to as semi-submersibles; or other hull forms (e.g. cylindrical/conical shaped). It is not applicable to tension leg platforms. Stationkeeping can be provided by a mooring system, a thruster assisted mooring system, or dynamic positioning. The function of the unit can be broad, including drilling, floatel, tender assist, etc. In situations where hydrocarbons are being produced, there can be additional requirements. The requirements of ISO 19905-3 apply to the hull and stationkeeping system for all types of mobile units. The activity specific operating guideline document requirements can be modified to be appropriate to the situation being assessed. ISO 19905-3 does not address all site considerations, and certain specific locations can require additional assessment. ISO 19905-3 is applicable only to mobile floating units that are structurally sound and adequately maintained, which is normally demonstrated through holding a valid RCS classification certificate. ISO 19905-3 does not address design, transportation to and from site, or installation and removal from site. ISO 19905-3 sets out the requirements for site-specific assessments, but generally relies on other documents to supply the details of how the assessments are to be undertaken. In general: - ISO 19901‑7 is referenced for the assessment of the stationkeeping system; - ISO 19904‑1 is referenced to determine the metocean actions on the unit; - ISO 19906 is referenced for arctic and cold regions; - the hull structure and airgap are assessed by use of a comparison between the site-specific metocean conditions and its design conditions, as set out in the RCS approved operations manual; - ISO 13624‑1 and ISO/TR 13624‑2[1] are referenced for the assessment of the marine drilling riser of mobile floating drilling units. Equivalent alternative methodologies can be used; - IMCA M 220[5] is referenced for developing an activity specific operating guidelines. Agreed alternative methodologies can be used. NOTE 1 The scope of ISO 19904‑1 specifically states that its requirements do not apply to mobile units, but the methodologies given for assessing metocean actions can be used. NOTE 2 RCS rules and the IMO MODU code[4] provide guidance for design and general operation of mobile floating units.