BS ISO 4126-10:2010
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Safety devices for protection against excessive pressure Sizing of safety valves for gas/liquid two-phase flow
Hardcopy , PDF
English
31-12-2010
04-04-2024
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Application range of the method
6 Sizing steps
Annex A (informative) - Identification of sizing
scenarios
Annex B (normative) - Sizing of a safety valve
Bibliography
Describes the sizing of safety valves for gas/liquid two-phase flow in pressurized systems such as reactors, storage tanks, columns, heat exchangers, piping systems or transportation tanks/containers. The possible fluid states at the safety valve inlet that can result in two-phase flow.
| Committee |
PSE/18/6
|
| DevelopmentNote |
Supersedes 06/30155498 DC. (12/2010)
|
| DocumentType |
Standard
|
| Pages |
56
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
This part of ISO4126 specifies the sizing of safety valves for gas/liquid two-phase flow in pressurized systems such as reactors, storage tanks, columns, heat exchangers, piping systems or transportation tanks/containers. The possible fluid states at the safety valve inlet that can result in two-phase flow are given in Table1. NOTE The expression “safety valve” is a synonym for valves as described in ISO4126-1, ISO4126-4 and ISO4126-5. Table1 Possible fluid state at the inlet of the safety valve that can result in two-phase flow Fluid state at valve inlet Cases Examples liquid subcooled (possibly flashing in the safety valve)saturated with dissolved gas cold waterboiling water CO2/water gas/vapour near saturated vapour (possibly condensing in the safety valve) steam gas/liquid vapour/liquidnon-evaporating liquid and non-condensable gas (constant quality) gas/liquid mixture, when gas is desorbed or produced steam/waterair/water
| Standards | Relationship |
| ISO 4126-10:2010 | Identical |
| ISO 4126-1:2013 | Safety devices for protection against excessive pressure — Part 1: Safety valves |
| API 520-1 : 2014 | SIZING, SELECTION, AND INSTALLATION OF PRESSURE-RELIEVING DEVICES - PART 1: SIZING AND SELECTION |
| API 521 : 2014 | PRESSURE-RELIEVING AND DEPRESSURING SYSTEMS |
| MIL-STD-882 Revision E:2012 | System Safety |
| IEC 60534-2-1:2011 | Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions |
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