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Shut Off Systems for Hazardous Gases Such as Methyl Mercaptan (CH3SH)About Methyl MercaptanOften referred to as ‘MESH’, Methyl Mercaptan is a very toxic and colorless flammable gas that gives off a repulsive odor. Upon inhalation or contact it attacks the central nervous system and can be lethal. It is used in organic synthesis and is an intermediate for jet fuel additives, fungicides, and methionine. At standard temperature and pressure, it exists as a gas. Its molecular weight is 1.66 times that of oxygen. MESH is shipped under its own vapor pressure of 15 psig @ 21.1°C in sealed tanks and ton containers. Railroad tank cars carrying MESH usually have top loading ball valves. Methyl Mercaptan Valve Closure Systems (Shutdown Systems)Powell Emergency Valve Closure Systems are designed to prevent significant releases of hazardous gases like Methyl Mercaptan. 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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