Condition Assessment Scheme (CAS)
MARPOL’s Condition Assessment Scheme (CAS)
CAS is a mandatory statutory survey scheme that Category 2 and Category 3 (non double hull) oil tankers must satisfactorily complete (with no outstanding recommendations) by 15 years of age or by the first intermediate or renewal survey due after 5 April 2005, whichever occurs later, in order to trade to their respective phase out date as per MARPOL 13G, which was accelerated by resolution MEPC.111(50) which enters into force on 5 April 2005.
CAS is required to be conducted in conjunction with, the mandatory Enhanced Survey Program (ESP) and builds upon ESP by requiring additional thickness measurements and close-up surveys. Relative to ESP, CAS is unique in two respects:
- CAS contains very specific responsibilities and deadlines for planning the survey, which must begin 8 months in advance of the survey’s commencement;
- The flag Administration must review/monitor the survey and reporting process and issue the five-year full term CAS Statement of Compliance).
The Condition Assessment Scheme (CAS) for oil tankers was adopted in 2001 and is applicable under the MARPOL convention to all single-hull tankers of 15 years or older.
The CAS does not specify structural standards in excess of the provisions of other IMO conventions, codes and recommendations.
It identifies three categories of tankers, as follows:
- “Category 1 oil tanker” means oil tankers of 20,000 tons deadweight and above carrying crude oil, fuel oil, heavy diesel oil or lubricating oil as cargo, and of 30,000 tons deadweight and above carrying other oils, which do not comply with the requirements for protectively located segregated ballast tanks (commonly known as Pre-MARPOL tankers).
- “Category 2 oil tanker” means oil tankers of 20,000 tons deadweight and above carrying crude oil, fuel oil, heavy diesel oil or lubricating oil as cargo, and of 30,000 tons deadweight and above carrying other oils, which do comply with the protectively located segregated ballast tank requirements (MARPOL tankers),
- “Category 3 oil tanker” means an oil tanker of 5,000 tons deadweight and above but less than the tonnage specified for Category 1 and 2 tankers.