Powell Fabrication & Manufacturing, Inc.

Methyl Mercaptan Valve Shutdown System

Methyl Mercaptan Valves

Various Cylinder, Ton Container, and Railcar Valves compatible with both Electric and Pneumatic actuators.  More...


Available Systems

UL-CUL Approved

Powell Valve Closure System control panels (UniPro family, MaxPro™ RA & E-Pro®) are listed by Underwriters Laboratory to UL 508A for Enclosed Industrial Control Panels. Panels are listed by Underwriters Laboratory bearing the UL & CUL mark for use in the United States and Canada markets. In applications where a CSA listed control panel in Canada is required, please contact Powell for further information.

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Methyl Mercaptan Valve Shutoff (CH3SH)  System

About Methyl Mercaptan

Often 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 at 21.1°C in sealed tanks and ton containers. Railroad tank cars carrying MESH usually have top loading ball valves.

Synonyms: CH3SH, Methyl sulfhydrate, Methyl thioalcohol, Methanethiol, Methvtiolo, Methylmercaptaan, Metil Mercaptano, RCRA Waste Number U153, Thiomethanol, UN 1064

Accidental Release of Methyl Mercaptan

In the event of an accidental release of methyl mercaptan, it is important to shut off the source of the gas, if it can be done safely. 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 shutdown system will immediately close the container valve, stopping the release regardless of where it occurs downstream.

It is possible to prevent an accidental release of methyl mercaptan. Contact us today to discuss your specific application requirements.

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Shutdown Systems for Various Container Sizes

Powell is the only manufacturer to offer both pneumatic or electric systems for 150 lb Gas Cylinders, Ton Containers, Railcars, Tank Cars, and Bullet Tanks.