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Shut Off Systems for Hazardous Gases Such as Sulfur DioxideAbout Sulfur Dioxide (SO2)Sulfur Dioxide is a colorless gas with a sharp, irritating odor at standard temperature and pressure. Inhalation can cause irritation of the eyes and respiratory tract. Released to the atmosphere, SO2 readily combines with moisture to form sulfuric acid, the main component of acid rain. Sulfur dioxide is a reducing bleach and can counter the effects of oxidizing bleaches. It is shipped in pressurized containers and railroad tank cars. Smaller containers use standard 660 type chlorine valves. Tank cars use any of several models of angle plug valves. Sulfur Dioxide Valve Closure Systems (Shutdown Systems)Powell Emergency Valve Closure Systems are designed to prevent significant releases of hazardous gases like sulfur dioxide. In the case of an accidental release, the emergency valve closure system will close the valves in 10 seconds or less, effectively preventing further release from the container. Back to List of Hazardous Gases Shutdown Systems for Various Container Sizes Powell is the only manufacturer to offer both pneumatic or electric systems for both small to large container sizes.
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