TS 3390 EN 764

TS 3390 EN 764 is a terminology-and-symbols standard for pressure equipment, focused on the core terms and graphic symbols used for pressure, temperature and volume. It helps ensure that the same physical quantities are named and marked consistently across design documents, calculations, drawings and operating instructions. In pressure vessels and related equipment, that common language matters because these quantities are central to safe engineering interpretation and correct documentation.

How the key quantities relate

Pressure, temperature and volume are tightly linked in pressure equipment engineering. Pressure describes the load applied by a fluid or gas; temperature influences material behavior and the state of the contained medium; volume describes capacity and the space available inside the vessel or system. Standardized terminology reduces ambiguity when these quantities appear in datasheets, technical drawings, calculation sheets and operating manuals. Graphic symbols support the same goal by giving compact, unambiguous visual references to the relevant measurement or parameter.

What this standard is and is not

The standard is mainly about the naming and notation of fundamental quantities, not about design rules or test procedures for pressure equipment itself. That makes it a reference for clear communication rather than a performance specification. Because it is based on EN 764:1994, it sits within the European terminology framework for pressure equipment, while the content here should be understood as general technical language guidance rather than a complete engineering design code.

• Provides common terminology for pressure, temperature and volume.
• Clarifies the meaning of symbols used in drawings and technical documents.
• Supports consistent communication in pressure equipment documentation.
• Helps reduce ambiguity in design, inspection and operation records.