An IMO survey scheme, made mandatory under regulation 20 of the revised MARPOL Annex I, designed to detect structural weaknesses in ageing single- hull oil tankers which are not retrofitted with a double hull in accordance with Annex I (as revised) regulation 19. CAS should not be confused with CAP (see above under SHIP CLASSIFICATION and CLASS DOCUMENTS).
What is the Condition Assessment Scheme (CAS)?
