21.— (1) No change shall be made in the structure, equipment, fittings, arrangements and material covered by a survey under the chemical tanker rules, other than by direct replacement, without the approval of the Minister or a person authorised by him or her for such purpose.

(2) Following receipt of a report referred to in section 20(5)(a) the Chief Surveyor or other surveyor of ships notified shall—

(a) if the ship being an Irish ship is in the jurisdiction of another state to which the Convention applies, ensure that the matter is reported by the master or owner of the ship to the appropriate authorities of the government of that state, and

(b) arrange for any additional survey which in his or her opinion may be required in the circumstances under the chemical tanker rules.