EN ISO 20486:2018
(Main)Non-destructive testing - Leak testing - Calibration of reference leaks for gases (ISO 20486:2017)
Non-destructive testing - Leak testing - Calibration of reference leaks for gases (ISO 20486:2017)
ISO 20486:2017 specifies the calibration of those leaks that are used for the adjustment of leak detectors for the determination of leakage rate in everyday use. One type of calibration method is a comparison with a reference leak. In this way, the leaks used for routine use become traceable to a primary standard. In other calibration methods, the value of vapour pressure was measured directly or calculated over a known volume.
The comparison procedures are preferably applicable to helium leaks, because this test gas can be selectively measured by a mass spectrometer leak detector (MSLD) (the definition of MSLD is given in ISO 20484).
Calibration by comparison (see methods A, As, B and Bs below) with known reference leaks is easily possible for leaks with reservoir and leakage rates below 10−7 Pa·m3/s.
Figure 1 gives an overview of the different recommended calibration methods.
Zerstörungsfreie Prüfung - Dichtheitsprüfung - Kalibrieren von Referenzlecks für Gase (ISO 20486:2017)
Dieser Entwurf einer Europäischen Norm spezifiziert die Kalibrierung der Lecks, die für die Justierung von Leckdetektoren für die Bestimmung von Leckageraten im täglichen Gebrauch verwendet werden. Eine Art des Kalibrierverfahrens ist ein Vergleich mit einem normierten Leck. Auf diese Weise werden die Lecks zur routinemäßigen Verwendung auf eine primäre Norm rückführbar, wie es nach der Normenreihe ISO 9000 erforderlich ist. Bei anderen Kalibrierverfahren wurde QpV direkt gemessen oder QpV wurde über ein bekanntes Volumen berechnet.
Die Vergleichsverfahren gelten vorzugsweise für Heliumlecks, da dieses Prüfgas selektiv mithilfe eines Massenspektrometerleckdetektors (en: mass spectrometer leak detector, MSLD) gemessen werden kann (die Definition des MSLD wird in ISO/DIS 20484 angegeben).
Die Kalibrierung durch Vergleich (siehe Verfahren A, As, B und Bs unten) mit bekannten Normlecks ist ein-fach möglich für Lecks mit Reservoir und Leckageraten unter 10–7 Pa m3/s.
Bild 1 zeigt einen Überblick, in dem Bereiche verschiedener Kalibrierverfahren empfohlen werden.
...
Bild 1a — Kalibrierbereich für Kalibrierung durch Vergleich
...
Bild 1b — Kalibrierbereich für Kalibrierung durch
Essais non destructifs - Contrôle d'étanchéité - Étalonnage des fuites de référence des gaz (ISO 20486:2017)
ISO 20486:2017 spécifie l'étalonnage des fuites utilisées dans le réglage des détecteurs de fuites et la détermination des flux de fuite, dans le cadre d'un usage quotidien. Un type de méthode d'étalonnage est une comparaison avec une fuite de référence. Ainsi, les fuites faisant l'objet d'un usage courant deviennent traçables par rapport à un étalon primaire. Dans d'autres méthodes d'étalonnage, la valeur de la pression de vapeur était mesurée directement ou calculée sur un volume connu.
Les modes opératoires d'étalonnage par comparaison sont de préférence applicables aux fuites d'hélium, car ce gaz d'essai peut être mesuré individuellement au moyen d'un détecteur de fuites à spectromètre de masse (DFSM) (la définition de DFSM est donnée dans l'ISO 20484).
L'étalonnage par comparaison (voir méthodes A, As, B et Bs ci-dessous) qui utilise des fuites de référence connues est facilement applicable aux fuites de réservoir et à celles dont les flux de fuite sont inférieurs à 10−7 Pa·m3/s.
Neporušitveno preskušanje - Preiskava tesnosti - Umerjanje referenčne tesnosti za plin (ISO 20486:2017)
Ta osnutek evropskega standarda določa umerjanje uhajanj, ki se uporabljajo za nastavitev detektorjev uhajanja z namenom določanja stopnje uhajanja pri vsakodnevni uporabi. Prednostna metoda umerjanja je v tem primeru primerjava s standardnim uhajanjem. Na ta način postanejo uhajanja pri rutinski uporabi sledljiva na podlagi primarnega standarda, kakor zahteva skupina standardov ISO 9000. Postopki primerjave se prednostno uporabljajo za uhajanje helija, saj je ta preskusni plin mogoče selektivno meriti z detektorjem uhajanja z masnim spektrometrom (MSLD) (opredelitev MSLD je podana v standardu EN 1330-8). Umerjanje na podlagi primerjave (glejte metodi A in B v nadaljevanju) z znanimi standardnimi uhajanji je enostavno izvedljivo za uhajanje iz rezervoarja in stopnjo uhajanja pod 10-7 Pa x m3/s. V območju od 10-7 Pa x m3/s do 10-4 Pa x m3/s uhajanja niso dovolj zanesljiva, da bi jih lahko uporabili kot standard za prenos. Uhajanja v tem območju je mogoče umerjati samo z merjenjem pretoka v umerjeni kapilarni cevi (glejte metodo C v nadaljevanju). Stopnje uhajanja, ki so večje od 10-4 Pa x m3/s je mogoče izmeriti z merilniki pretoka, ki so umerjeni v skladu s primarnimi nacionalnimi standardi.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2018
1DGRPHãþD
SIST EN 13192:2002
SIST EN 13192:2002/AC:2004
1HSRUXãLWYHQRSUHVNXãDQMH3UHLVNDYDWHVQRVWL8PHUMDQMHUHIHUHQþQHWHVQRVWL]D
SOLQ ,62
Non-destructive testing - Leak testing - Calibration of reference leaks for gases (ISO
20486:2017)
Zerstörungsfreie Prüfung - Dichtheitsprüfung - Kalibrieren von Referenzlecks für Gase
(ISO 20486:2017)
Essais non destructifs - Contrôle d'étanchéité - Étalonnage des fuites de référence des
gaz (ISO 20486:2017)
Ta slovenski standard je istoveten z: EN ISO 20486:2018
ICS:
19.100 Neporušitveno preskušanje Non-destructive testing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 20486
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2018
EUROPÄISCHE NORM
ICS 19.100 Supersedes EN 13192:2001
English Version
Non-destructive testing - Leak testing - Calibration of
reference leaks for gases (ISO 20486:2017)
Essais non destructifs - Contrôle d'étanchéité - Zerstörungsfreie Prüfung - Dichtheitsprüfung -
Étalonnage des fuites de référence des gaz (ISO Kalibrieren von Referenzlecks für Gase (ISO
20486:2017) 20486:2017)
This European Standard was approved by CEN on 23 December 2017.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
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Turkey and United Kingdom.
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COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20486:2018 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 20486:2018) has been prepared by Technical Committee ISO/TC 135 "Non-
destructive testing" in collaboration with Technical Committee CEN/TC 138 “Non-destructive testing”,
the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2018, and conflicting national standards shall
be withdrawn at the latest by August 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 13192:2001.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 20486:2017 has been approved by CEN as EN ISO 20486:2018 without any modification.
INTERNATIONAL ISO
STANDARD 20486
First edition
2017-12
Non-destructive testing — Leak
testing — Calibration of reference
leaks for gases
Essais non destructifs — Contrôle d'étanchéité — Étalonnage des
fuites de référence des gaz
Reference number
ISO 20486:2017(E)
©
ISO 2017
ISO 20486:2017(E)
© ISO 2017, Published in Switzerland
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ii © ISO 2017 – All rights reserved
ISO 20486:2017(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Nominal leakage rates . 3
5 Classification of leaks . 3
5.1 Permeation leak . 3
5.2 Conductance leaks . 3
5.2.1 Capillary leak . 3
5.2.2 Aperture leak (orifice) . 4
5.2.3 Compressed powder leak . 4
6 Calibration by comparison . 4
6.1 Methods A, A , B and B .
s s 4
6.2 Applicability of comparison methods . 4
6.3 Preparation of leaks and apparatus . 5
6.3.1 Leak detector . 5
6.3.2 Connection to the leak detector . 5
6.3.3 Temperature accommodation . 7
6.4 Measurement . 7
6.4.1 Set-up . 7
6.4.2 General measurement sequence . 7
6.5 Evaluation for methods A, A , B and B (Comparison) . 8
s s
6.5.1 Determination of leakage rate . 8
6.5.2 Influence factors to measurement uncertainty . 9
7 Volumetric calibration.10
7.1 Direct flow (Method C) .10
7.1.1 General.10
7.1.2 Equipment .10
7.1.3 Preparation of leaks and apparatus .10
7.1.4 Measurement .11
7.1.5 Evaluation for Method C (direct flow measurement) .13
7.2 Leak measurement under water (Method D) .14
7.2.1 General.14
7.2.2 Equipment .14
7.2.3 Preparation of leaks and apparatus .14
7.2.4 Measurement .15
7.2.5 Evaluation for Method D .16
7.2.6 Influence factors to measurement uncertainty .17
7.3 Calibration by (volumetric) gas meter (Method E) .17
7.3.1 General.17
7.3.2 Equipment .18
7.3.3 Preparation of leaks and apparatus .18
7.3.4 Measurement .18
7.3.5 Evaluation for Method E (gas meter) .18
7.3.6 Influence factors to measurement uncertainty .19
7.4 Calibration by pressure change in a known volume (Method F) .19
7.4.1 General.19
7.4.2 Preparation of leaks and apparatus .20
7.4.3 Measurement .22
7.4.4 Special situation in vacuum chambers .23
7.4.5 Evaluation for Method
...
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