Section 4 Water Quality Assurance

4.1.1  A data logging system with full redundancy for monitoring water acidity, temperature, salinity, turbidity and residual chlorine for each cargo tank and main manifolds are to be installed on board ship in the control room.

4.1.2 Two high accuracy electromagnetic reversible flow meters are to be installed in the mains on deck.

4.2.1 A full flow automatic chlorination system is to be installed. As guidance on the chlorination system, a capacity of up to 400 mg/litre for a VLCC is to be installed.

4.2.2 Other tank washing systems will be accepted provided they are to be acceptable to the National Authority with whom the ship is registered and/or by the Administration within whose territorial jurisdiction the ship is intended to operate.

4.2.3 Care is to be taken when designing the tanks to ensure to minimise crevices, corners and other inaccessible areas that cannot be properly cleaned.