TS EN 764-1+A1

TS EN 764-1+A1 is a terminology standard for pressure equipment and assemblies, bringing together the terms and definitions used in this field. This part supports a common understanding of core descriptors such as pressure, temperature, volume and nominal size, which are fundamental in pressure equipment documentation and design language.

The standard specifies terms and definitions for pressure equipment and assemblies within the scope of the European Directives on pressure equipment. In general technical practice, a terminology standard of this kind helps keep drawings, specifications, conformity documents and equipment classifications aligned so that the same concepts are used consistently across design, manufacture, operation and inspection contexts.

Core concepts in pressure equipment terminology

Pressure, temperature, volume and nominal size describe different but connected aspects of pressure equipment. Pressure relates to the loading condition within a system; temperature influences material behaviour and operating limits; volume describes the capacity of a vessel or system; and nominal size is a standardized dimensional identifier used for components and connections. Standardized definitions matter because pressure vessels, piping, safety accessories and other components must be described with the same technical meaning throughout the supply chain.

How this A1 edition fits the document set

• This entry is an amendment to EN 764-1, so it should be read as an update to the parent terminology standard rather than a standalone replacement for all pressure equipment requirements.
• The referenced base document is EN 764-1:2015+A1:2016, which focuses on shared terminology for pressure equipment.
• Its scope states that the definitions apply to equipment and assemblies within the European pressure equipment directives, while also noting broader applicability to other pressure equipment use cases.