ISO/TS 12747:2011给出了至少应遵循的指南，以评估将ISO 13623中定义的管道系统的使用寿命延长至其指定设计寿命之外的可行性。ISO/TS 12747:2011适用于刚性金属管道。 泵站、压缩机站、减压站和仓库在ISO/TS 12747:2011中没有具体说明。 ISO/TS 12747:2011不适用于以下情况:柔性管道；由玻璃钢等其他材料制成的管道；脐；平台上部设备；以及结构和结构部件。 ISO/TS 12747:2011仅限于寿命延长，这是对原始设计进行更改的一个例子。 其他变化，如MAOP上升评级，则不包括在内。 该评估方法适用于用户自行决定的其他设计变更。

ISO/TS 12747:2011 gives guidance to follow, as a minimum, in order to assess the feasibility of extending the service life of a pipeline system, as defined in ISO 13623, beyond its specified design life. ISO/TS 12747:2011 applies to rigid metallic pipelines. Pump stations, compressor stations, pressure-reduction stations and depots are not specifically addressed in ISO/TS 12747:2011. ISO/TS 12747:2011 is not applicable to the following: flexible pipelines; pipelines constructed from other materials, such as glass reinforced plastics; umbilicals; topsides equipment; and structures and structural components. ISO/TS 12747:2011 is limited to life extension, which is an example of a change to the original design. Other changes, such as MAOP up-ratings, are excluded. The assessment methodology is applicable to other changes to the design at the discretion of the user.