#119 Jacketed valves keep sulphur and similar flow media from solidifying.  Problem: A major chemical producer is "mining" sulphur offshore in the Gulf Of Mexico. While the process is referred to as mining, it is similar to tertiary oil production. Steam is injected into wells deep into the ocean floor. The steam liquefies the sulphur and it is pumped to the surface. The sulphur is stored in tanks on the offshore platform. There is a daily transfer of the produced sulphur to transport barges. The valves in the transfer lines were a problem area. To remain liquid, the sulphur must be above 280 degrees F. Where the sulphur comes in contact with the cooler valve surfaces, it tended to solidify and accumulate in the valve. This prevented both proper flow and tight shutoff  Solution: Compact, lightweight Tufline Jacketed Sleeved Plug Valves were installed in the transfer lines. The steam jacket on the valves kept the sulphur hot and flowing. The valve's compact design means that it can be easily and economically jacketed. The valve's light weight is an important consideration on offshore platforms. Unlike gate and ball valves, this valve has no cavities where flow media can accumulate and solidify. As the valve is operated and the plug is rotated there is a wiping action which helps remove accumulated material from the plug surface.  Results: Any shutdown of an offshore facility is costly. The chemical company indicates that the valve's long service life and low maintenance requirements help cut operating costs. Index of all performance report case histories.