TS EN 1333

TS EN 1333 is a terminology standard that defines PN in the context of pipework components and their joints, and identifies the PN numbers used within that system. It provides a common pressure-class reference for selecting flanges and other pipework components that need to work together within the same designation scheme.

What PN means in pipework practice

In general technical use, PN is a pressure designation used to mark a component according to a nominal pressure class. It helps align flanges, valves, fittings, and related metallic pipework components under a common selection language so that system design, ordering, and documentation are consistent. The concept is about classification and compatibility rather than a single physical dimension.

According to the scope information supplied for this document, the standard defines the term PN and specifies the PN numbers used. In other words, it establishes the shared terminology for understanding the PN marking system for metallic pipework and pipework components, without going beyond that subject matter.

Why the distinction matters for flanges and joints

Flanged joints are widely used where a pipeline needs a detachable connection for assembly, maintenance, or replacement. A clear PN system helps ensure that mating parts are selected against the same pressure-class logic, reducing ambiguity in drawings, specifications, and procurement. For pipework components in metallic systems, this shared language supports consistent technical communication across design and manufacturing.

• Definition of the PN term
• PN numbers used for metallic pipework and pipework components
• A common pressure-class language for flanges and joints