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Siemens Pressure equipment directive 97/23/EC

Siemens Pressure equipment directive 97/23/EC

Siemens Pressure equipment directive 97/23/EC

Product Code: Pressure equipment directive 97/23/EC

Manufacturer: Siemens


The pressure equipment directive 97/23/EC applies to the alignment of the statutory orders of the European member states for pressure equipment used within its European area of validity. Equipment as defined by the directive includes vessels, pipelines and accessories with a maximum permissible pressure of more than 0.5 bar above atmospheric pressure.

Application of the pressure equipment directive was optional from November 29, 1999 onwards and has been mandatory since May 29, 2002.

Categorization according to danger potential

In compliance with the pressure equipment directive, equipment is divided into categories I to III or Article 3 paragraph 3 according to danger potential (medium/pressure/volume/nominal diameter).

The following criteria are decisive for assessment of the danger potential and are also shown in the diagrams (see “Characteristic curves”).


Fluid group

Group 1 or 2

Aggregate state

Liquid or gaseous

Type of pressurized equipment

  • Pipeline

Nominal diameter, pressure or product of pressure and nominal diameter (PS * DN)


Liquids according to Article 3 are those liquids whose steam pressure is not more than 0.5 bar above standard atmospheric pressure (1013 mbar) at the maximum permissible temperature.

The maximum permissible temperature for the liquids used is the user-defined maximum process temperature. This must be within the limits defined for the equipment.

Categorization of media (liquid/gaseous) into fluid groups

In compliance with Article 9, fluids are divided into the following fluid groups:

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