PURPOSE OF CAS
The purpose of the Condition Assessment Scheme (CAS) is to provide an international standard to meet the requirements of MARPOL 73/78 Annex I regulations 20.6, 20.7 and 21.6.1.
CAS is applicable to :
- oil tankers of 5,000 tons deadweight and above and of 15 years and over after date of delivery of the ship, in accordance with regulation 20.6,
- oil tankers subject to the provisions of regulation 20.7, where authorization is requested for continued service beyond the anniversary of the date of delivery of the ship in 2010, and
- oil tankers of 5,000 tons deadweight and above and of 15 years and over after date of delivery of the ship, carrying crude oil as cargo having at 15°C a density at 15°C higher than 900 kg/m3 but lower than 945 kg/m3 , in accordance with regulation 21.6.1.
For the purpose of CAS, oil tankers are divided into the following categories:
Category 1 oil tanker – an oil tanker 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 oil other than the above, which does not comply with the requirements for new oil tanker as defined in regulation 1.28.4 of Annex I to MARPOL 73/78 (which does not comply with the requirements for protectively located segregated ballast tanks).
Category 2 oil tanker – an oil tanker 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 oil other than the above, which complies with the requirements for new oil tanker as defined in regulation 1.28.4 of MARPOL 73/78, Annex I (which complies with the protectively located segregated ballast tank requirements).
Category 3 oil tanker – an oil tanker of 5,000 tons deadweight and above but less than that specified in regulation 20.3.1 or 20.3.2 of Annex I to MARPOL 73/78.
