ISO 20485:2017
Non-destructive testing — Leak testing — Tracer gas method
ISO 20485:2017 describes the techniques to be applied for the detection of a leak, using a tracer gas and a tracer gas specific leak detector.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principles of detection
5 Generation and detection of tracer gas flow
5.1 Tracer gas flows into the object (Group A techniques)
5.2 Tracer gas flows out of the object (Group B techniques)
6 Apparatus
7 Object preparation
8 Group A techniques, tracer gas flows into the object.
8.1 General
8.2 Initial system set-up procedure
8.3 Vacuum technique (total) test procedure (A.1)
8.4 Vacuum technique (partial) test procedure (A.2)
8.5 Vacuum technique (local) test procedure (A.3)
9 Group B techniques, tracer gas flows out of object
9.1 General
9.2 Initial system set up procedure
9.2.1 Ammonia test with colour-change reagents (B.1)
9.2.2 Tracer gas flowing out of the object (B.2, B.3, B.4, B.6)
9.2.3 Pressurisation — Evacuation test (B.5)
9.3 Ammonia test procedure (B.1)
9.3.1 General
9.3.2 Test object preparation
9.3.3 Reagent application
9.3.4 Ammonia pressurization
9.3.5 Impregnation time
9.3.6 Visual examination
9.3.7 Post test cleaning
9.4 Vacuum box test procedure (B.2.1, B.2.2)
9.4.1 General
9.4.2 Vacuum box technique for closed objects B.2.1
9.4.3 Vacuum box technique for open objects B.2.2
9.5 Accumulation technique (B.3)
9.5.1 General
9.5.2 Accumulation technique procedure (B.3)
9.6 Sniffing test (B.4)
9.7 Bombing technique (B.5)
9.8 Vacuum chamber technique (B.6)
9.9 Carrier gas technique (B.7)
10 Test report
Annex A (informative) Accumulation technique: calibrated leak connected to enclosure of unknown volume
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principles of detection
5 Generation and detection of tracer gas flow
5.1 Tracer gas flows into the object (Group A techniques)
5.2 Tracer gas flows out of the object (Group B techniques)
6 Apparatus
7 Object preparation
8 Group A techniques, tracer gas flows into the object.
8.1 General
8.2 Initial system set-up procedure
8.3 Vacuum technique (total) test procedure (A.1)
8.4 Vacuum technique (partial) test procedure (A.2)
8.5 Vacuum technique (local) test procedure (A.3)
9 Group B techniques, tracer gas flows out of object
9.1 General
9.2 Initial system set up procedure
9.2.1 Ammonia test with colour-change reagents (B.1)
9.2.2 Tracer gas flowing out of the object (B.2, B.3, B.4, B.6)
9.2.3 Pressurisation — Evacuation test (B.5)
9.3 Ammonia test procedure (B.1)
9.3.1 General
9.3.2 Test object preparation
9.3.3 Reagent application
9.3.4 Ammonia pressurization
9.3.5 Impregnation time
9.3.6 Visual examination
9.3.7 Post test cleaning
9.4 Vacuum box test procedure (B.2.1, B.2.2)
9.4.1 General
9.4.2 Vacuum box technique for closed objects B.2.1
9.4.3 Vacuum box technique for open objects B.2.2
9.5 Accumulation technique (B.3)
9.5.1 General
9.5.2 Accumulation technique procedure (B.3)
9.6 Sniffing test (B.4)
9.7 Bombing technique (B.5)
9.8 Vacuum chamber technique (B.6)
9.9 Carrier gas technique (B.7)
10 Test report
Annex A (informative) Accumulation technique: calibrated leak connected to enclosure of unknown volume
Bibliography