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BS EN ISO 4126-10:2024 – TC

BS EN ISO 4126-10:2024 – TC

$280.87

Tracked Changes. Safety devices for protection against excessive pressure – Sizing of safety valves and bursting discs for gas/liquid two-phase flow

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BSI 2024 203
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This document specifies the sizing of safety valves and bursting discs for gas/liquid two-phase flow in pressurized systems such as reactors, storage tanks, columns, heat exchangers, piping systems or transportation tanks/containers, see Figure 2. The possible fluid states at the safety device inlet that can result in two-phase flow are given in Table 1. NOTE          The pressures used in this document are absolute pressures, not gauge pressures.

PDF Catalog

PDF Pages PDF Title
123 undefined
127 Annex ZA(informative)Relationship between this European Standard and the essential safety requirements of Directive 2014/68/EU (Pressure Equipment Directive) aimed to be covered
130 Foreword
131 Introduction
132 1 ​Scope
2 ​Normative references
3 ​Terms and definitions
3.1 ​General
133 3.2 ​Pressure
135 3.3 ​Flow rate
136 3.4 ​Flow area
3.5 ​Fluid state
3.6 ​Temperature
137 4 ​Symbols and abbreviated terms and figures
4.1 ​Symbols
139 4.2 ​Abbreviated terms
140 4.3 ​Figures
142 5 ​Application range of the method
5.1 ​General
5.2 ​Limitations of the method for calculating the two-phase mass flux in safety devices
5.2.1 ​Flashing flow
143 5.2.2 ​Condensing flow
5.2.3 ​Flashing flow for multi-component liquids
5.2.4 ​Dissolved gases
144 5.2.5 ​Compressibility coefficient ω
5.3 ​Limitations of the method for calculating the mass flow rate required to be discharged
5.3.1 ​Rate of temperature and pressure increase
5.3.2 ​Immiscible liquids
6 ​Sizing steps
6.1 ​General outline of sizing steps
145 6.2 ​Step 1 — Identification of the sizing case
146 6.3 ​Step 2 — Flow regime at the inlet of the vent line system
6.3.1 ​General
6.3.2 ​Phenomenon of level swell
6.3.3 ​Influence of liquid viscosity and foaming behaviour on the flow regime
148 6.3.4 ​Prediction of the flow regime (gas/vapour or two-phase flow)
151 6.4 ​Step 3 — Calculation of the mass flow rate required to be discharged
6.4.1 ​General
6.4.2 ​Pressure increase caused by an excess in-flow
153 6.4.3 ​Pressure increase due to external heating
156 6.4.4 ​Pressure increase due to thermal runaway reactions
160 6.5 ​Step 4 — Calculation of the dischargeable mass flux through and pressure change in the vent line system
6.5.1 ​General
163 6.5.2 ​ Two-phase flow discharge coefficient, Kdr,2ph
164 6.5.3 ​Dimensionless mass flow rate, C
165 6.5.4 ​Compressibility coefficient, ω (numerical method)
166 6.5.5 ​Calculation of the downstream stagnation condition
6.5.6 ​Slip correction for non-flashing two-phase flow
167 6.5.7 ​Slip correction for two-phase flow in straight pipes
6.6 ​Step 5 — Ensure proper operation of safety valve vent line systems under plant conditions
6.7 ​Simultaneous calculation of the dischargeable mass flux and pressure change in the vent line system
168 6.8 Summary of calculation procedure
175 Annex A (informative) Identification of sizing scenarios
177 Annex B (informative) Example calculation of the mass flow rate to be discharged
181 Annex C (informative) Example of calculation of the dischargeable mass flux and pressure change through connected vent line systems
198 Annex D (informative) Environmental factor
199 Bibliography

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BS EN ISO 4126-10:2024 - TC
$280.87