石油和天然气工业. 管道输送系统. 钢制箱形管道的设计, 施工和维护

[中文适用范围]： 本文件规定了钢套管及其安装的要求和维护，包括用于保护的钢套管管道、石油和天然气工业中的管道。本文件还适用于在穿越道路、铁路和其他构筑物时为管道提供机械保护的钢套管的安装要求。NOTE 1：对于设计、运输、制造和系统而言，可以使用钢套管对管道进行机械保护。NOTE 2：本文件并不意味着建议使用套管是强制性的或必要的。NOTE 3：本文件并不意味着套管会直接影响带有未套管穿越段的干线管道的腐蚀。然而，套管可能会通过屏蔽阴极保护电流或降低套管附近干线管道的阴极保护效果来不利地影响干线管道的完整性。因此不建议使用套管，除非出于载荷考虑、不稳定土壤条件或由于合理工程实践要求必须使用套管。 [外文原描述]： ISO 16440:2016 specifies requirements, including corrosion protection, for the design, fabrication, installation and maintenance of steel-cased pipelines for pipeline transportation systems in the petroleum and natural gas industries in accordance with ISO 13623. NOTE 1 Steel casings can be used for mechanical protection of pipelines at crossings, such as at roads and railways and the installation of a casing at a highway, railway, or other crossing can be required by the permitting agency or pipeline operator. NOTE 2 This document does not imply that utilization of casings is mandatory or necessary. NOTE 3 This document does not imply that cased crossings, whether electrically isolated or electrically shorted, contribute to corrosion of a carrier pipe within a cased crossing. However, cased crossings can adversely affect the integrity of the carrier pipe by shielding cathodic protection (CP) current to the carrier pipe or reducing the CP effectiveness on the carrier pipe in the vicinity of the casing. Their use is not recommended unless required by load considerations, unstable soil conditions, or when their use is dictated by sound engineering practices.