What is CAS (condition assessement scheme) ?

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CONDITON ASSESMENT SCHEME
ƒÞ Operation of oil tankers of certain specified categories beyond the specified date is permitted, subject to compliance with the CAS.
ƒÞ Procedure for preparation, conduct of survey, reporting and certification are given in the amendment 2001 to MARPOL 73/78.
ƒÞ CAS involves enhanced surveys along with thickness measurement of various hull members.  
ƒÞ CAS surveys shall be carried out concurrently with intermediate or renewal surveys when the enhanced survey programme is applicable as per SOLAS chapter XI.
ƒÞ The surveys have to be carried out by a recognised organisation (RO), which is authorized by the administration.
ƒÞ Thickness measurement (TM) firm is a qualified company certified by the RO.
ƒÞ  Not less than two qualified exclusive surveyors of the RO shall carry out the survey.
ƒÞ The surveyor must have experience of conducting renewal surveys and must undergo appropriate training and familiarization programme.
ƒÞ Thickness measurement shall be carried out by the certified TM firm in the presence of the surveyor of the RO.
ƒÞ CAS applies to surveys of hull structure in way of cargo tanks, pump room, cofferdams, pipe tunnels, void spaces within the cargo area and all ballast tanks including the fore peak and aft peak tanks.
ƒÞ In addition to overall surveys of the above spaces, it also includes close up surveys of structural member such as bulkheads, web frames, deck transverses, bottom transverses and all connected structural members.
ƒÞ Proper access must be provided for the close-up survey.
ƒÞ Tank coatings and corrosion protection system shall be inspected. Good coating need not be removed.
ƒÞ Thickness measurement shall be carried out on all deck plates, bottom plates, three transverse sections including at least one in way of a ballast tank, structural subject to close-up surveys, suspect areas, wind  and water strakes, internals of fore peak and aft peak tanks and exposed superstructure decks