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Homepage>BS Standards>13 ENVIRONMENT. HEALTH PROTECTION. SAFETY>13.240 Protection against excessive pressure>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
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immediate downloadReleased: 2021-06-14
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

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

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Standard number:21/30384379 DC
Pages:86
Released:2021-06-14
Status:Draft for Comment
DESCRIPTION

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.

NOTE

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.

Table 1
Possible fluid state at the inlet of the safety valve or bursting disc that can result in two-phase flow
Fluid state at device inlet Cases Examples
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


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