This part of the European Standard defines the basic terminology and symbols to be used for pressure equipment addressed by the European Directive 97/23/EC with regard to pressure, temperature, volume and nominal size.
For the purpose of this standard "pressure equipment" means vessel, piping, pressure accessory and safety accessory.
Relations between pressure quantities defined in this standard are shown in Figures 4 and 5 of EN 764-7. These figures also illustrate relations between these pressures and those related to the safety accessory.
NOTE 1 In addition to terms used in the three official CEN languages (English, French and German), this European Standard gives in annex A the equivalent terms in the Danish, Dutch, Finnish, Greek, Icelandic, Italian, Norwegian, Portuguese, Spanish, and Swedish languages; these are published under the responsibility of the respective member bodies for those countries. However, only the terms and definitions given in the official languages can be considered as EN terms and definitions.
NOTE 2 This part of the European Standard does not stipulate the units to be used for the quantities defined. These are to be taken from the other parts of the standard.