本推荐规程（RP）适用于用于运输危险液体或天然气的任何管道系统，包括美国联邦法规第49篇第192和195部分中定义的管道系统。本RP旨在为操作员提供关于裂纹完整性管理和导致裂纹机制的威胁的行业成熟实践的描述。本指南主要针对沿路权（ROW）的线路管道，但一些过程和方法可应用于管道设施，包括与管道系统相关的管道站、终端和输送设施。与搭接焊接（LW）管道和选择性缝焊腐蚀（SSWC）相关的缺陷不包含在本RP中。 本RP介绍了管道行业对管道破裂的理解。讨论了导致裂纹的机理，回顾了估计裂纹破坏压力的方法，并提出了估计裂纹扩展的方法。讨论了针对各种类型的裂纹、操作条件和管道特性选择适当的完整性评估方法。本RP还回顾了在线检测（ILI）技术和沟内无损评估（ITD）技术的最新知识。提出了一种对ILI适应症作出反应的方法，以及何时对某些结果作出反应的具体标准。回顾了适用的维修技术。本节讨论了重新评估间隔的确定以及适当预防和缓解措施的考虑。 讨论了用于测量裂纹管理计划有效性的一些性能指标。关于裂纹形成、扩展和失效的技术讨论旨在提供运营商所需的知识，以有效地做出有关管理其管道系统裂纹的完整性决策。

This recommended practice (RP) is applicable to any pipeline system used to transport hazardous liquid or natural gas, including those defined in U.S. Title 49 Code of Federal Regulations (CFR) Parts 192 and 195.This RP is designed to provide the operator with a description of industry-proven practices in the integrity management of cracks and threats that give rise to cracking mechanisms. The guidance is largely targeted to the line pipe along the right-of-way (ROW), but some of the processes and approaches can be applied to pipeline facilities, including pipeline stations, terminals, and delivery facilities associated with pipeline systems. Defects associated with lap-welded (LW) pipe and selective seam weld corrosion (SSWC) are not covered within this RP.This RP presents the pipeline industry's understanding of pipeline cracking. Mechanisms that cause cracking are discussed, methods to estimate the failure pressure of cracks are reviewed, and methods to estimate crack growth are presented. Selection of the appropriate integrity assessment method for various types of cracking, operating conditions, and pipeline characteristics is discussed.This RP also reviews current knowledge about in-line inspection (ILI) technology and in-the-ditch (ITD) nondestructive evaluation technology. A methodology for responding to ILI indications and specific criteria for when to respond to certain results is presented. Applicable repair techniques are reviewed. Sections are included for the discussion of reassessment interval determination and the consideration of appropriate preventive and mitigative measures. Some performance metrics for measuring the effectiveness of a crack management program are discussed.The technical discussion about crack formation, growth, and failure is to provide the knowledge needed by operators to effectively make integrity decisions about managing cracking on their pipeline systems.