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Homepage>BS Standards>13 ENVIRONMENT. HEALTH PROTECTION. SAFETY>13.240 Protection against excessive pressure>BS ISO 4126-10:2010 Safety devices for protection against excessive pressure Sizing of safety valves for gas/liquid two-phase flow
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immediate downloadReleased: 2010-12-31
BS ISO 4126-10:2010 Safety devices for protection against excessive pressure Sizing of safety valves for gas/liquid two-phase flow

BS ISO 4126-10:2010

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

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Standard number:BS ISO 4126-10:2010
Pages:56
Released:2010-12-31
ISBN:978 0 580 57618 8
Status:Standard
DESCRIPTION

BS ISO 4126-10:2010


This standard BS ISO 4126-10:2010 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 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 valve 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.

Table 1

Possible fluid state at the inlet of the safety valve that can result in two-phase flow

Fluid state at valve inlet Cases Examples
liquid subcooled (possibly flashing in the safety valve)

saturated

with dissolved gas

cold water

boiling water

CO2/water

gas/vapour near saturated vapour (possibly condensing in the safety valve) 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