TS EN 1333

TS EN 1333 is a standard that defines how PN is to be understood for pipework components and clarifies the core concept used when selecting components under PN designation systems. Its focus is the pressure-class terminology applied to parts of a pipework system; in other words, PN is a classification and selection reference used within the relevant product standards, not a stand-alone guarantee of a component’s allowable service pressure in every condition.

PN as a common language for pipework components

In piping and process systems, pipes, flanges, valves, fittings and similar components are often described through a shared pressure designation. PN, or nominal pressure, helps designers and manufacturers select components that belong to the same system logic. From a general technical perspective, this makes compatibility easier to manage across different product families, while material strength, dimensions and operating conditions still have to be assessed through the applicable component standard. PN therefore works as a common reference point rather than as a complete design statement on its own.

What this standard covers

The scope of the standard is limited to giving the definition of PN as used in standards that employ the PN designation system. TS EN 1333 therefore establishes the terminology base for the PN concept as applied to pipework system components; it does not, by itself, define the design details, test regime or performance limits of a specific product type. In practice, it serves as a reference document that supports consistent terminology across related piping standards.

• PN is a designation and selection reference for pipework components.
• This standard defines PN; it does not set product-specific design details.
• Its scope is tied to other standards that use the PN designation system.
• The terminology helps different components be selected within a common piping framework.