If storage tanks storing crude oil are not cleaned regularly, dirt, water and oily sediment at the bottom of the tank can be disturbed, and contaminate the contents. Therma-Flite Holo-Scru® desorption units heat residual material to 1,000-plus-degrees Fahrenheit, so that hydrocarbons and water vapor are condensed and recovered. These tank bottoms may also be discarded after they have been thermally treated to recover hydrocarbons. Multi-stage systems make the process even simpler by removing water in one unit, while removing hydrocarbons in a second.
There are Therma-Flite Holo-Scru® installations that have been in operation for more than 20 years processing tank bottom sludges and other feed stocks such as soil and catalyst fines