Carbon dioxide warning sign

To dispose of, allow carbon dioxide to release, sublime, or dissipate into the open air. Avoid releasing into courtyards or indoors or any areas where heavy carbon dioxide vapors can accumulate. Figure 2-5 shows a carbon dioxide warning sign and detector system. 

Figure 2-5 Carbon dioxide warning sign and detector...

Liquid aluminum sulfate storage and sign, 34 2-5 Carbon dioxide warning sign and detector, 36 2-6 Posted chlorine evacuation procedure, 38 2-7 Breathing apparatus, 39... 

Carbon dioxide gas is an asphyxiant, a potent respiratory stimulant, and both a stimulant and depressant of the central nervous system. Fatalities have occurred after people have entered enclosures where air has been largely displaced by CO2. Therefore, fixed, automatic CO2 systems require a time delay pre-evacuation alarm period (often 30 seconds), warning signs, and an alarm signal incorporated into the system design to allow sufficient time for personnel evacuation prior to CO2 release. Verification of the oxygen level must be made prior to reentry. 

When a fixed system is activated, a major portion of the rapidly expanding gas wiU become carbon dioxide vapor, while the remainder will become very fine particles of dry ice. There will also be condensed water vapor due to the cooling action of the expanding gas. As a result, visibility may be limited and individuals trapped in an area may have difficulty finding their way out. An area equipped with an automatic carbon dioxide extinguishing system should be posted with warning signs, such as ... 

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