The ATC technology cleaned the tank in 250.48 h, representing a 50.3% reduction in cleaning time. A total of 117.6 h of confined−space entry was required, which amounts to a reduction of 77% compared with the total confined−space entry time required by the previous manual cleaning operation. Only 65 bbl of washwater was required to clean the tank compared with 512 bbl used in the past, amounting to a reduction of 87% in freshwater use. Total barite solids removed was 47.6 tonUK.