本文件规定了石油和天然气行业管道运输系统中使用的耐腐蚀合金（CRA）复合弯管的设计、几何尺寸、材料、制造程序、检验方法、无损检测（NDT）、标记、包装和储存的技术交付条件。 本文件适用于用于石油和天然气行业输送含有单相或多相流体（如油、气和水）的腐蚀性介质的运输或工艺管道中的CRA包覆弯管。它也可以作为其他领域的参考。 指定了复合弯管的两种技术交付条件等级。B级为复合弯管提供了标准质量水平，S级为酸性弯管提供了技术要求- 使用条件。买方有责任根据预期用途和设计要求指定适当的等级。

This document specifies the technical delivery conditions regarding design, geometric dimensions, materials, manufacturing procedures, inspection methods, non-destructive testing (NDT), marking, package and storage for corrosion resistant alloy (CRA) clad bends for use in pipeline transportation systems for the petroleum and natural gas industries. This document is applicable to CRA clad bends for use in transportation or process pipelines transporting corrosive media-containing single-phase or multi-phase fluid such as oil, gas and water for the petroleum and natural gas industries. It can also be used as reference in other fields. Two technical delivery conditions classes for clad bends are designated. Class B provides a standard quality level for clad bends and Class S provides technical requirements for sour-service conditions. It is the responsibility of the purchaser to specify the appropriated class, based upon the intended use and design requirements.