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25.—(1) Every ship of 400 GT and above shall be provided with a tank or tanks of adequate capacity, having regard to the type of machinery installed and length of voyage, to receive any oily residues (sludges) which cannot be dealt with in accordance with the requirements of these Regulations, such as those resulting from the purification of fuel and lubricating oils and oil leakages in the machinery spaces.
(2) In new ships, such tanks shall be designed and constructed so as to facilitate their cleaning and the discharge of residues to reception facilities. Existing ships shall comply with this requirement so far as it is reasonable and practicable to do so.
(3) Every ship to which this regulation applies shall be provided with piping to enable residues from machinery spaces and machinery space bilges to be pumped to a reception facility. This piping shall be led to the open deck and there fitted with a flange in accordance with dimensions given in Schedule 2 in Merchant Shipping Notice No 1643/MARPOL 1.
(4) Piping to and from sludge tanks shall have no direct connection overboard other than the discharge connection required by paragraph (3).
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