What is the approximate expansion ratio when CO2 is discharged from a nozzle?

The expansion ratio of carbon dioxide (CO2) when it is discharged from a nozzle is significant in understanding how it behaves as a fire suppression agent. When CO2 is discharged, it rapidly changes from a stored liquid state to a gaseous state, which leads to a dramatic increase in volume.

The expansion ratio of approximately 450:1 indicates that one part of liquid CO2 expands to about 450 parts of gas upon discharge into the atmosphere. This large expansion contributes to the efficacy of CO2 as a suppressant in fire situations, as it can displace oxygen and smother flames quickly.

Understanding the expansion ratio is crucial for technicians and contractors to ensure proper application and effectiveness of CO2 systems in various environments, particularly in areas where water-based suppression systems may not be suitable. The knowledge of such properties aids in the proper design and maintenance of fire protection systems, ensuring safety and reliability.