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|
|Status:||Draft for Comment|
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) |
with dissolved gas
|cold water |
|gas/vapour||near saturated vapour (possibly condensing in the safety device)||steam|
non-evaporating liquid and non-condensable gas (constant quality)
gas/liquid mixture, when gas is desorbed or produced