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ISO 21013-3:2016 Cryogenic vessels - Pressure-relief accessories for cryogenic service - Part 3: Sizing and capacity determination >
ISO 21013-3:2016 Cryogenic vessels - Pressure-relief accessories for cryogenic service - Part 3: Sizing and capacity determination, 2016
- Foreword
- 1 Scope
- 2 Normative references
- 3 Symbols
- 4 Calculation of the total quantity of heat transferred per unit time from the hot wall (outer jacket) to the cold wall (inner vessel)
- 4.1 General
- 4.2 Under conditions other than fire
- 4.2.1 Vacuum-insulated vessels under normal vacuum
- 4.2.2 Pressure build-up device
- 4.2.3 Vacuum-insulated vessels in the case of loss of vacuum and non-vacuum insulated vessels
- 4.2.4 Supports and piping
- 4.3 Under fire conditions
- 4.3.1 Insulation system remains fully or partially in place during fire conditions
- 4.3.2 Insulation system does not remain in place during fire conditions
- 4.4 Air or Nitrogen condensation
- 4.4.1 General
- 4.4.2 Loss of vacuum with air and nitrogen
- 4.4.3 Fire with loss of vacuum with air or nitrogen
- 4.5 Heat transfer per unit time (watts)
- 4.5.1 General
- 4.5.2 Normal operation
- 4.5.3 Pressure build up regulator fully open
- 4.5.4 Loss of vacuum condition
- 4.5.5 Fire condition with loss of vacuum, vacuum jacket, and insulation fully or partially in place
- 4.5.6 Fire condition with loss of vacuum, insulation not in place
- 4.5.7 Total heat transfer rate
- 5 Calculation of the mass flow to be relieved by pressure relief devices
- 5.1 Relieving pressure, P, less than the critical pressure
- 5.2 Relieving pressure, P, equal to or greater than the critical pressure
- 5.3 Example
- 6 Piping for pressure relief devices
- 6.1 Pressure drop
- 6.1.1 General
- 6.1.2 Relief valves
- 6.1.3 Bursting discs
- 6.2 Back pressure consideration
- 6.3 Heat transfer
- 7 Sizing of pressure relief devices
- 7.1 General
- 7.2 Sizing of pressure relief valves
- 7.2.1 Discharge capacity
- 7.2.2 Determination of critical vs. subcritical flow for gases
- 7.2.3 Critical flow
- 7.2.4 Subcritical flow
- 7.2.5 Recommended analysis method
- 7.2.6 Example
- 7.3 Sizing of bursting discs
- 7.3.1 Discharge capacity
- 7.3.2 Determination of critical vs. subcritical flow for gases
- 7.3.3 Critical flow
- 7.3.4 Subcritical flow
- 7.3.5 Recommended analysis method
- 7.3.6 Example
- Annex A (informative) Cryostats
- Bibliography [Go to Page]