ISO INTERNATIONAL STANDARD 20484 First edition 2017-03 Non-destructive testing Leak testing — Vocabulary Essais non-destructifs - Controle d'étanchéité - Vocabulaire Reference number IS0 20484:2017(E) [so @ IS0 2017 IS0 20484:2017(E) Contents Page Foreword iv Introduction 1 Scope. 2 Normative references 3 Terms and definitions .. 3.1 Atomic/molecular structure 3.2 Pressure and vacuum. 3.3 Gas-solid interaction. 4 Terms relating to gas. 4.1 Properties of gases. 4.2 Flow of gas... 5 Terms relating to test techniques 5.1 Test techniques... 5.2 Test equipment.. 5.3 Test equipment components 6 Terms relating to test procedure 6.1 Preparation/calibration. 6.2 Test techniques.. 8 6.3 Performance limits @ IS0 2017 - All rights reserved iii IS0 20484:2017(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through Iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with Iso, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization The procedures used to develop this document and those intended for its further maintenance are described in the IsO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of IsO documents should be noted. This document was drafted in accordance with the editorial rules of the IsO/IEc Directives, Part 2 (see Wwwiso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of any patent rights identified during the development of the document will be in the Introduction and/or on the Iso list of patent declarations received (see www.isa.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of Iso specific terms and expressions related to conformity assessment, as well as information about IsO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: Www.iso.arg/isa/foreword.html IS0 20484 was prepared by the European Committee Standardization (CEN) Technical Committee CEN/TC 138, Leak testing, in collaboration with ISO Technical Committee TC 135, Non-destructive testing, Subcommittee Sc 6, Leak testing, in accordance with the agreement on technical cooperation between ISO and CEN (Vienna Agreement). This document is based on and replaces the European standard EN 1330-8:1998, Non-destructive testing -Terminology-Part 8: Terms used in leak tightness testing. iv @ IS0 2017 - All rights reserved