ISO 21329:2004规定了ISO 13623中定义的石油和天然气工业管道运输系统中使用的机械连接器的测试要求并提供了指南。 ISO 21329:2004中规定的试验旨在构成连接器设计验证过程的一部分。它们提供了连接器符合规定性能范围的客观证据。 ISO 21329:2004未涵盖将设计程序用作机械连接器鉴定过程的一部分，也未涉及制造和质量控制。但是，它可以用作资格认证程序的输入。 尽管ISO 21329:2004的原则可以应用，但它并未涉及a）设计用于在使用中旋转的连接器，b）歧管，c）上部组块管道工程或管道，d）法兰，e）通过卷轴或J形管拉力安装的管道中使用的连接器，f）工厂验收测试，g）用于风险分析的统计基础。

ISO 21329:2004 specifies requirements and provides guidance for the testing of mechanical connectors for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623. The tests specified in ISO 21329:2004 are intended to form part of the design verification process for connectors. They provide objective evidence that connectors conform to a defined performance envelope. ISO 21329:2004 does not cover the use of design procedures as part of the qualification process for mechanical connectors, nor does it address fabrication and quality control. However, it can be used as input to a qualification procedure.Although its principles can be applied, ISO 21329:2004 does not address a) connectors that are designed to rotate in use, b) manifolds, c) topsides pipework or piping, d) flanges, e) connectors used in pipelines installed by reeling or J-tube pulls, f) factory acceptance testing, g) statistical bases for risk analysis.