CGA P 25 : 2007

1 Introduction
2 Scope
3 Definitions
   3.1 Cryogenic liquid
   3.2 Oxygen-enriched atmosphere
   3.3 Oxygen-deficient atmosphere
   3.4 Qualified technical personnel
4 Hazards
   4.1 Enhanced flammability
   4.2 Asphyxiation
   4.3 Low temperature
5 General storage tank system design considerations
   5.1 Inner tank
   5.2 Outer tank
   5.3 Piping and nozzles
   5.4 Foundations
   5.5 Annular space purge/pressurizing gas
   5.6 Tank grounding
   5.7 Additional considerations for oxygen service
6 Overpressure and vacuum protection
   6.1 Protected hazard
   6.2 Inner tank pressure control
   6.3 Inner tank pressure indication and monitoring
   6.4 Inner tank overpressure protection
   6.5 Inner tank vacuum protection
   6.6 Outer tank overpressure protection
   6.7 Outer tank vacuum protection
   6.8 Installation and sizing criteria
   6.9 Inspection and testing methods
7 Overfill protection
   7.1 Liquid level measurement devices
   7.2 Other system designs
8 Liquid nozzle(s) and inlet and outlet piping
   protection
   8.1 Protected hazard
   8.2 Protective systems
   8.3 Liquid nozzle mechanical integrity
9 Storage system vents
   9.1 Flat-bottomed tank vents
   9.2 Venting from LOX/LIN/LAR storage systems
   9.3 Pressure relief devices
   9.4 Automatic vent valves
   9.5 Vent pipes
   9.6 Dry gas purge
10 Site selection and separation distances
   10.1 Location
   10.2 Containment
   10.3 Vapor barriers
   10.4 Codes and standards
11 Operator training and emergency response
   11.1 Training of personnel
   11.2 Emergency procedures
12 Tank construction and commissioning
13 Management of change in tank service
14 References
Table
Appendices
Appendix A - Diagram for typical flat-bottomed storage
             tank system (Informative)
Appendix B - Definition of terms for a typical flat-bottomed
             cryogenic storage tank system (Informative)

Provides general information for designers, owners, operators or fabricators involved with LOX, LIN, LAR flat-bottomed cryogenic storage tank systems.