The Pressure Equipment Directive 97/23/EC (PED)  of the EU sets out the standards for the design and fabrication of pressure equipment ("pressure equipment" means steam boilers, pressure vessels, piping, safety valves and other components and assemblies subject to pressure loading) generally over one litre in volume and having a maximum pressure more than 0.5 bar gauge. It also sets the administrative procedures requirements for the "conformity assessment" of pressure equipment, for the free placing on the European market without local legislative barriers. It has been mandatory throughout the EU since 30 May 2002. This is enacted in the UK as the Pressure Equipment Regulations (PER). The set out standards and regulations regarding pressure vessels and boilers safety is also very close to the US standards defined by the American Society of Mechanical Engineers (ASME). This enables most international inspection agencies to provide both verification and certification services to assess compliance to the different pressure equipment directives.
- Scope and Definitions (including exemptions of its scope)
- Market surveillance
- Technical requirements: classification of pressure equipment according to type and content.
- Free movement
- Presumption of conformity
- Committee on technical standards and regulations
- Committee on Pressure Equipment
- Safeguard clause
- Classification of pressure equipment
- Conformity assessment
- European approval for materials
- Notified bodies
- Recognized third-party organizations
- User inspectorates
- CE marking
- Unduly affixed CE marking
- International cooperation
- Decisions entailing refusal or restriction
- Transposition and transitional provisions
- Addressees of the Directive: the EU member states for implementation in national laws and/or regulations.
- Annex I: Essential safety requirements
- Fired or otherwise heated pressure equipment with a risk of overheating (article 3.1)
- Specific quantitative requirements for certain pressure equipment
- Appendix II: Conformity assessment tables. Actually diagrams of pressure vs. volume (or diameter for pipes), for classification of equipment in four classes.
- Appendix III: Conformity assessment procedures
- Appendix IV: Minimum criteria to be met when designating the notified bodies (article 12) and the recognized third party organizations (article 13)
- Appendix V: Criteria to be met when authorizing user inspectorates (article 14)
- Appendix VI: CE marking
- Appendix VII: Declaration of conformity
Directive 97/23/EC will be fully superseded by directive 2014/68/EU from July 20, 2016 onwards. Article 13 of the new directive (classification of pressure equipment) has already been in effect since June 1, 2015, replacing article 9 of directive 97/23/EC.