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BS EN ISO 4126-10:2024

BS EN ISO 4126-10:2024

$215.11

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

Published By Publication Date Number of Pages
BSI 2024 82
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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
2 undefined
6 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
9 Foreword
10 Introduction
11 1 ​Scope
2 ​Normative references
3 ​Terms and definitions
3.1 ​General
12 3.2 ​Pressure
14 3.3 ​Flow rate
15 3.4 ​Flow area
3.5 ​Fluid state
3.6 ​Temperature
16 4 ​Symbols and abbreviated terms and figures
4.1 ​Symbols
18 4.2 ​Abbreviated terms
19 4.3 ​Figures
21 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
22 5.2.2 ​Condensing flow
5.2.3 ​Flashing flow for multi-component liquids
5.2.4 ​Dissolved gases
23 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
24 6.2 ​Step 1 — Identification of the sizing case
25 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
27 6.3.4 ​Prediction of the flow regime (gas/vapour or two-phase flow)
30 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
32 6.4.3 ​Pressure increase due to external heating
35 6.4.4 ​Pressure increase due to thermal runaway reactions
39 6.5 ​Step 4 — Calculation of the dischargeable mass flux through and pressure change in the vent line system
6.5.1 ​General
42 6.5.2 ​ Two-phase flow discharge coefficient, Kdr,2ph
43 6.5.3 ​Dimensionless mass flow rate, C
44 6.5.4 ​Compressibility coefficient, ω (numerical method)
45 6.5.5 ​Calculation of the downstream stagnation condition
6.5.6 ​Slip correction for non-flashing two-phase flow
46 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
47 6.8 Summary of calculation procedure
54 Annex A (informative) Identification of sizing scenarios
56 Annex B (informative) Example calculation of the mass flow rate to be discharged
60 Annex C (informative) Example of calculation of the dischargeable mass flux and pressure change through connected vent line systems
77 Annex D (informative) Environmental factor
78 Bibliography

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BS EN ISO 4126-10:2024
$215.11