API 5L 46th-2018 Line Pipe API 5L 管线钢管 第46版本 2018年新版标准

Introduction This specification is based on API Spec 5L,45th Edition.

In the preparation of this document,the technical committee maintained the concept of two basic levels of standard technical requirements for line pipe expressed as two product specification levels (PSL 1 and PSL 2).Level PSL 1 provides a standard quality level for line pipe.Level PSL 2 has additional mandatory requirements for chemical composition,notch toughness and strength properties,and additional nondestructive testing.Requirements that apply to only PSL 1 or to only PSL 2 are so designated.

Requirements that are not designated to a specific PSL designation apply to both PSL 1 and PSL 2 pipes.

The technical committee also recognized that the petroleum and natural gas industries often specify additional requirements for particular applications.In order to accommodate such needs,optional additional requirements for special applications are available,as follows: PSL 2 pipe ordered with a qualified manufacturing procedure (Annex B),the requirements of which have been enhanced to include verification detail of critical processes in the production of feedstock material,line pipe manufacture,and product testing and inspection; -PSL 2 pipe ordered with resistance to ductile fracture propagation in gas pipelines(Annex G); -PSL 2 pipe ordered for sour service(Annex H); -pipe ordered as through the flowlinepipe(Annexl); -PSL 2 pipe ordered for offshore service(AnnexJ).

The following new annex has been added to this specification: -PSL 2 Pipe Ordered for Applications Requiring Longitudinal Plastic Strain Capacity(Annex N).

The requirements of the annex apply only when specified on the purchase order.

When pipe is ordered for dual or multiple applications,the requirements of more than one annex for special applications can be invoked.In such instances,if a technical conflict arises due to applying the requirements of more than one annex for special applications,the most stringent requirement applicable to the intended service shall apply.

This specification does not provide guidance on when it is necessary to specify the above supplementary requirements.Instead,it is the responsibility of the purchaser to specify,based on the intended use and design requirements,which,if any,of the supplementary requirements apply for a particular purchase order.

简介本规范以API规范5L第45版为基础。

在本文件的编制过程中，技术委员会保留了管线管标准技术要求的两个基本级别的概念，即两个产品规范级别（PSL 1和PSL 2）。PSL 1级别为管线管提供了标准质量级别。PSL 2级别对化学成分有附加的强制性要求。缺口韧性和强度特性，以及附加的无损检测。仅适用于PSL 1或PSL 2的要求如此指定。

未指定特定PSL名称的要求适用于PSL 1和PSL 2管道。

技术委员会还认识到，石油和天然气行业通常规定了特殊应用的附加要求。为了满足此类需要，可提供特殊应用的可选附加要求，如下所示：PSL 2管道按照合格的制造程序订购（附录B），要求其中包括原料生产、管道制造和产品测试和检验中关键工艺的验证细节；订购的PSL 2管道应能抵抗天然气管道中的延性断裂扩展（附录G）；订购的PSL 2管道应能承受酸性介质（附录H）；订购的管道应为“T”。h通过流线“管道（附录）；-PSL 2海上服务用管道（附录J）。

本规范增加了以下新附录：订购PSL 2管道，用于需要纵向塑性应变能力的应用（附录N）。

附件的要求仅在采购订单上规定时适用。

当订购的管道用于双重或多重应用时，可以调用一个以上的特殊应用附件的要求。在这种情况下，如果由于应用一个以上的特殊应用附件的要求而产生技术冲突，则应采用适用于预期服务的最严格要求。

本规范不提供必要时规定上述补充要求的指导。相反，买方有责任根据预期用途和设计要求，规定补充要求（如有）适用于特定采购订单。

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