21/30384379 DC
BS EN ISO 4126-10. Safety devices for protection against excessive pressure Part 10. Sizing of safety valves and bursting discs for gas/liquid two-phase flow
Standard number: | 21/30384379 DC |
Pages: | 86 |
Released: | 2021-06-14 |
Status: | Draft for Comment |
21/30384379 DC
This standard 21/30384379 DC BS EN ISO 4126-10. Safety devices for protection against excessive pressure is classified in these ICS categories:
- 23.060.40 Pressure regulators
- 13.240 Protection against excessive pressure
This part of ISO 4126 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. The possible fluid states at the safety device inlet that can result in two-phase flow are given in Table 1.
The expression “safety valve” is a synonym for valves as described in ISO 4126-1, ISO 4126-4 and ISO 4126-5. The expression “bursting disc” is a synonym for bursting disc safety device as described in ISO 4126-2, ISO 4126-3 and ISO 4126-6.
liquid | subcooled (possibly flashing in the safety device) saturated with dissolved gas | cold water boiling water CO2/water |
gas/vapour | near saturated vapour (possibly condensing in the safety device) | steam |
gas/liquid | vapour/liquid non-evaporating liquid and non-condensable gas (constant quality) gas/liquid mixture, when gas is desorbed or produced | steam/water air/water |