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 Definition A chemical engineering process unit used in petroleum refineries that reduces the viscosity of the residual oil from the refinery's atmospheric or vacuum distillation of petroleum crude oil. [d] [e]
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 Workgroup category Engineering [Categories OK]
 Subgroup category:  Chemical Engineering
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Wikipedia has an article with the same name

I was a major conributor to the WP article. I have completely re-written, reformatted and revised the WP article before porting it here to CZ. I uploaded a better flow diagram than the one in the WP article and I deleted sections which were either too detailed, off-topic or better suited to a another stand-alone article. Milton Beychok 13:36, 28 August 2008 (CDT)