ISO 21013-4:2012
Cryogenic vessels — Pilot operated pressure relief devices — Part 4: Pressure-relief accessories for cryogenic service
ISO 21013-4:2012 specifies the requirements for the design, manufacture and testing of pilot operated pressure relief valves for cryogenic service, i.e. for operation with cryogenic fluids in addition to operation at temperatures from ambient to cryogenic. It is restricted to valves not exceeding a size of DN 300 designed to relieve single phase vapours, gases, or mixtures of gases and/or vapours.
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CVP_Secretariat_Loca
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 General
4.2 Design
4.3 Materials
5 Qualification and testing
5.1 Type approval
5.2 Type approval tests
5.3 Production testing
6 Determination of the certified coefficient of discharge (Kdr)
7 Set pressure tolerances
8 Re-seating pressure
9 Cleanliness
10 Marking
10.1 Marking on the shell body of the main valve
10.2 Marking on the body of the pilot valve
10.3 Marking on an identification plate
10.4 Additional marking
11 Sealing
Bibliography
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CVP_Secretariat_Loca
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 General
4.2 Design
4.3 Materials
5 Qualification and testing
5.1 Type approval
5.2 Type approval tests
5.3 Production testing
6 Determination of the certified coefficient of discharge (Kdr)
7 Set pressure tolerances
8 Re-seating pressure
9 Cleanliness
10 Marking
10.1 Marking on the shell body of the main valve
10.2 Marking on the body of the pilot valve
10.3 Marking on an identification plate
10.4 Additional marking
11 Sealing
Bibliography