Powell Adds Electric System to Line of Emergency Shut-off Systems for Pressurized 1-Ton and 150-Pound Cylinders of Chlorine, Sulfur Dioxide, Ammonia and Other Hazardous Gases ST. LOUIS, Mich., Oct. 4, 2005 (PRIMEZONE) -- Powell Fabrication & Manufacturing, Inc., a world-recognized technology leader in the chlor-alkali industry, has developed an electric emergency...