Winstead Sechrest & Minick, P.C.
Sealed observation element for sulfur recovery unit
 A sealed observation element for viewing the flow of molten liquid during the operation of a sulfur recovery unit comprises at least one sight glass that is heated and which may be swept with a purge gas supplied through one or more bleed rings to prevent condensation or deposition of materials on the side of the sight glass exposed to the process stream. 
Koch Enterprises, Inc.
G C C B G
G01F C01B C01B B01J G01P
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George W. James E. Craig S.
Taggart Lewis Ward