压力设备指令（PED）要求压力设备的各个项目 在适当的情况下进行合格评定。这也适用于压力容器组件 需要进行全球合格评定（GCA）和CE标记的设备。 英国国内的经验表明，组装完成后，该过程通常效果良好 作为工厂供应的完整产品投放市场。但是，当程序集 全球合格评定的法律程序是在安装地点现场创建的 经常被发现不符合要求。移交给供应商时未进行全球合格评定的组件 最终用户可能需要额外的验证，以确认其是否适合国家标准下的服务 压力系统安全法规（PSSR）等法规。除了欧盟委员会发布的某些工作组指南外，没有 目前，PED的综合指南可用于帮助参与项目的各个利益相关者 组装过程。范围本指南针对所有各方（除通知机构或用户检查机构外——见注释 在英国参与现场安装组件的设计和制造商。这包括以下各方:最终用户（包括负责采购组件或任命 承包商）主要承包商现场安装承包商设计顾问控制和仪表承包商管道承包商调试团队本文件旨在为负责以下事项的各方提供必要的指导: 确保进行全球合格评定的压力设备组件。

The Pressure Equipment Directive (PED) requires that individual items of pressure equipment undergo conformity assessment where appropriate. This also applies to assemblies of pressure equipment which need to undergo global conformity assessment (GCA) and CE marking. Experience within the UK indicates that generally this process works well when assemblies are placed on the market as complete, factory supplied products. However when assemblies are created on site at the place of installation the legal process of global conformity assessment is often found to be non-compliant.Assemblies which do not have a global conformity assessment when they are handed over to the end user, may require additional verification to confirm their suitability for service under national legislation such as Pressure Systems Safety Regulations (PSSR).Other than certain Working Party Guidelines published by the European Commission there is no comprehensive guidance to PED currently available to assist the various stakeholders involved in the assembly process.ScopeThis guidance is aimed at all parties (other than notified bodies or user inspectorates - see note below) who are involved in the design and manufacturer of site installed assemblies in the UK.This includes the following parties:End users (including those responsible for procurement of the assembly or appointment of contractors)Main contractorsSite erection contractorsDesign consultantsControl and instrumentation contractorsPiping contractorsCommissioning teamsThe document is intended to provide the necessary guidance to all parties with responsibilities for the pressure equipment assembly to ensure global conformity assessment can take place.