The initial survey referred to in Regulation 4 of Annex I of MARPOL 73/78 shall
include a complete inspection of the crude oil washing equipment and
arrangements and shall include, except for the cases specified in 4.2.11, an examination of the tanks after
they have been crude oil washed and the additional controls as specified
in 4.2.10 to ensure that the washing
system efficiency is in accordance with these Specifications.