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Foreword 0 Introduction 0 1 Scope 0 2 Normative references 0 3 Terms and definitions 0 4 Symbols and abbreviations 0 5 Type test 0 5.1 Test conditions 0 5.1.1 Preparation of a valve to be tested 0 5.1.2 Test fluid 0 5.1.3 Test temperature 0 5.1.4 Measurement of test valve temperature 0 5.1.5 Leakage measurement 0 5.2 Test procedures 0 5.2.1 Safety rules 0 5.2.2 Test equipment 0 5.2.3 Stem (or shaft) seal adjustment (SSA) 0 5.2.4 Test description 0 6 Performance classes 0 6.1 Classification criteria 0 6.2 Tightness classes 0 6.2.1 Definition 0 6.2.2 Helium as test fluid 0 6.2.3 Methane as test fluid 0 6.2.4 Correlations 0 6.3 Endurance classes 0 6.3.1 Mechanical-cycle classes for isolating valves 0 6.3.2 Mechanical-cycle classes for control valves 0 6.4 Temperature classes 0 6.5 Examples of class designation 0 6.6 Marking 0 7 Reporting 0 8 Extension of qualification to untested valves 0 Annex A (normative) Total leak rate measurement 0 Annex B (normative) Leak measurement using the sniffing method 0 Annex C (informative) Leak rate conversion (helium) 0 Bibliography 0

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