Crude Oil Tanker

Crude oil is not sensitive to cross contamination.    For this reason, to avoid pollution, the tanks are crude oil washed on discharge to control slops and the need for tank entry for cleaning is limited to pre-drydock and repairs.    Double hull vessels have clean internals which are easily cleaned.   Good practice includes coating deckheads and tank bottoms to avoid pitting damage due to moisture.

Specific risk may be lack of oxygen and toxic fumes such as H₂S