ISO 4126-3:2020
Safety devices for protection against excessive pressure — Part 3: Safety valves and bursting disc safety devices in combination
This document specifies only the requirements for a product assembled from the in-series combination of safety valves or CSPRS (controlled safety pressure relief systems) according to ISO 4126‑1, ISO 4126‑4 and ISO 4126‑5, and bursting disc safety devices, according to ISO 4126‑2, installed upstream of the valve within five pipe diameters of the valve inlet. It specifies the design, application and marking requirements for such products, composed of the bursting disc safety device, a safety valve or CSPRS and, where applicable, a connecting pipe or spool piece. In addition, it gives a method for establishing the combination discharge factor used in sizing combinations.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Design of combination
6 Installation of combination
7 Combination performance
8 Determination of combination discharge capacity factor, Fd, by testing
8.1 General
8.2 Test requirements
8.3 Test rig
8.4 Test method
8.5 Test procedure
8.6 Acceptance criteria of the tests
8.6.1 General
8.6.2 Conditions applicable to the safety valve
8.6.3 Conditions applicable to the bursting disc safety device
8.6.4 Conditions applicable to combination
9 Derivation of combination discharge capacity factor, Fd
10 Alternative to testing for Fd
11 Certification of combination discharge capacity factor, Fd
12 Application and use of the certified combination discharge capacity factor, Fd
13 Marking and identification of combination devices
13.1 Bursting disc safety device
13.2 Safety valve
13.3 Combination
14 Documentation
15 Preparation for storage and transport
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Design of combination
6 Installation of combination
7 Combination performance
8 Determination of combination discharge capacity factor, Fd, by testing
8.1 General
8.2 Test requirements
8.3 Test rig
8.4 Test method
8.5 Test procedure
8.6 Acceptance criteria of the tests
8.6.1 General
8.6.2 Conditions applicable to the safety valve
8.6.3 Conditions applicable to the bursting disc safety device
8.6.4 Conditions applicable to combination
9 Derivation of combination discharge capacity factor, Fd
10 Alternative to testing for Fd
11 Certification of combination discharge capacity factor, Fd
12 Application and use of the certified combination discharge capacity factor, Fd
13 Marking and identification of combination devices
13.1 Bursting disc safety device
13.2 Safety valve
13.3 Combination
14 Documentation
15 Preparation for storage and transport