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Basic Concepts

Rated Pressure

The pressure rating (also nominal pressure rating) is required for the standardisation of components, described by the internationally (ISO 7286) accepted term PN.

It is stated without a unit quantity. Its numerical value states the permissible working gauge pressure in bar at a temperature of 20°C (68°F) to which a component or specified material may be subjected. In the field of pump technology, it is common to use pressure ratings according to DIN 2401 for the range from PN 1.6 to PN 200.

Preferential designation for pressure ratings are 1.6; 2.5; 4; 6; 10; 16; 25; 40....

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Basic Concepts

Vapour Pressure

Vapour pressure is the absolute pressure (also saturated steam pressure) which the vapour of a substance assumes in equilibrium with its liquid or solid phase, whereby in centrifugal pump technology only the transition between gaseous and liquid phase is of significance.

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