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Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Design and Performance Requirements
4.1 Design, material and structural
4.2 Performance and discharge
5 Test
5.1 Factory test
5.2 Performance and discharge test
6 Determination of the Discharge
6.1 Determination of coefficient of discharge
6.2 Theoretical flowing (discharge) capacity using steam as the test medium
6.3 Theoretical flowing (discharge) capacity using air or any gas as the test medium
6.4 Capacity correction for the effect of back pressure
6.5 Theoretical flowing (discharge) capacity using a liquid as the test medium
6.6 Viscosity correction factors for liquids
6.7 Alternative method of calculation for the theoretical flowing capacity for any fluid
7 Equivalent Capacity
7.1 Valves for gas or vapour relief
7.2 Calculation of equivalent capacity
8 Marking and Sealing
8.1 Marking on the body of the safety valve
8.2 Marking on an identification plate
8.3 Sealing of a safety valve
9 Quality Assurance System
10 Installation of Safety Valves
10.1 Environmental conditions
10.2 Mounting
10.3 Inlet piping
10.4 Discharge piping
10.5 Access to safety valves
11 Adjustment, Maintenance and Repair of Safety Valves
Annex A (Informative) Derivation of superheat correction factor, Ksh
Annex B (Informative) Derivation of compressibility factor, Z
Annex C (Informative) Typical outline of subjects for inclusion in the quality assurance system
Annex D (Informative) Viscosity correction factor for liquids
Annex E (Informative) Alternative method of calculation for the theoretical flowing capacity
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