TS EN 764-1

TS EN 764-1 is a terminology standard for pressure equipment, defining the basic terms and symbols used for pressure, temperature, volume and nominal size. Its focus is to align the language used for pressure equipment covered by European Directive 97/23/EC so that these core concepts are interpreted consistently across related technical documents.

Why the core terms are separated and defined

Pressure equipment is a broad field that includes vessels, piping, pressure accessories and safety accessories. In that context, precise definitions for quantities such as pressure, temperature and volume, as well as nominal size, are essential for design communication, dimensioning and technical documentation. This standard organizes the relationships between these quantities at a conceptual level; the units themselves are not included here and are handled in other standards of the series.

Technical context and practical use

Terminology standards of this kind create a common engineering vocabulary for calculations, markings, specifications and regulation-related documentation. In pressure systems, even a small difference in wording can affect operating limits, classification or conformity-related interpretation, so standardised definitions are especially important. TS EN 764-1 belongs to that vocabulary framework, but it does not set out the full technical requirements for pressure equipment; it provides the foundational terms and symbols only.

• Basic terms and symbols for pressure, temperature, volume and nominal size
• Pressure equipment treated as vessels, piping, pressure accessories and safety accessories
• Conceptual relationships referenced to EN 764-7
• Units excluded from this part and addressed in other standards of the series