The Merchant Shipping (Control of Pollution by Noxious Liquid Substances in Bulk) Regulations 1987

Exemption—Categories A, B and C

17.  Notwithstanding the provisions of regulations 3—11 any tank from which a Category A or Category B or Category C substance has been unloaded shall not be required to be washed and the resultant washings discharged before the ship leaves the port of unloading as required by those regulations if a Marpol surveyor at the port of unloading exempts the ship from those regulations on one of the following grounds:—

(a) the tank is to be re-loaded with the same substance or another substance compatible with it and the tank will not be washed or ballasted before such re-loading;

(b) (i) the tank is neither to be washed nor ballasted at sea; and

(ii) the requirements for washing and discharge will be complied with in respect of that tank at another port; and

(iii) it has been confirmed in writing to the satisfaction of the Secretary of State, or if the port is not in the United Kingdom, of the government or other proper authority of the state in which the port is situated, that an adequate reception facility will be available for the purpose at that other port; or

(c) the substance is one for which cleaning by ventilation is stated to be appropriate in the ship’s Procedures and Arrangements Manual or is approved by the Secretary of State.