An apparatus for cleaning the interior of storage tanks of the type used for storing large volumes of crude oil wherein hydrocarbon sludge accumulates with the passage of time. The apparatus comprises a crude oil circulator having rotatable nozzles positioned within the tank, a gear member externally...http://www.google.es/patents/US5460331?utm_source=gb-gplus-sharePatente US5460331 - Apparatus for dispersion of sludge in a crude oil storage tank
Apparatus for dispersion of sludge in a crude oil storage tank
