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fitting, material, appliance or apparatus is at least as effective as that required 
by this Annex. This authority of the Administration shall not extend to substi- 
tution of operational methods to effect the control of discharge of oil as equiva- 
lent to those design and construction features which are prescribed by Regula- 
tions in this Annex. 
(2) The Administration which allows a fitting, material, appliance or appa- 
ratus, as an alternative to that required by this Annex Shall communicate to the 
Organization for circulation to the Parties to the Convention particulars thereof, 
for their information and appropriate action, if any. 
Regulation 4 
SURVEYS 
(1) Every oil tanker of 150 tons gross tonnage and above, and every other 
ship of 400 tons gross tonnage and above shall be subject to the surveys specified 
below : 
(a) An initial survey before the ship is put in Service or before the certificate 
required under Regulation 5 of this Annex is issued for the first time, which 
shall include a complete survey of its structure, equipment, fittings, arrange- 
ments and material insofar as the ship is covered by this Annex. 
This survey shall be such as to ensure that the structure, equipment, fittings. 
arrangements and material fully comply with the applicable requirements of 
this Annex. 
(b) Periodical surveys at intervals specified by the Administration, but not 
exceeding five years, which shall be such as to ensure that the structure, equip- 
ment, fittings, arrangements and material fully comply with the applicable re- 
quirements of this Annex. However, where the duration of the International Oil 
Pollution Prevention Certificate (1973) is extended as specified in Regulation 
8(3) or (4) of this Annex, the interval of the periodical survey may be extended 
correspondingly. 
(c) Intermediate surveys at intervals specified by the Administration but 
not exceeding thirty months, which shall be such as to ensure that the equip)- 
ment and associated pump and piping systems, including oil discharge monitor- 
ing and control systems, oily-water separating equipment and oil filtering systems, 
fully comply with the applicable requirements of this Annex and are in good 
working order. Such intermediate surveys shall be endorsed on the International 
Oil Pollution Prevention Certificate (1973) issued under Regulation 5 of this 
Annex. 
(2) The Administration shall establish appropriate measures for ships which 
are not subject to the provisions of paragraph (1) of this Regulation -in order 
to ensure that the applicable provisions of this Annex are complied with. 
(3) Surveys of the ship as regards enforcement of the provisions of this 
Annex shall be carried out by officers of the Administration. The Administration 
may, however, entrust the surveys either to surveyors nominated for the purpose 
or to organizations recognized by it. In every case the Administration concerned 
fully guarantees the completeness and efficiency of the surveys. 
(4) After any survey of the ship under this Regulation has been completed, 
no significant change shall be made in the structure, equipment, fittings, arrange- 
ments or material covered by the survey without the sanction of the Administra- 
tion, except the direct replacement of such equipment or fittings. 
Regulation 5 
ISSUE OF CERTIFICATE 
(1) An International Oil Pollution Prevention Certificate (1973) shall he 
issued, after survey in accordance with the provisions of Regulation 4 of this 
Annex, to any oil tanker of 150 tons gross tonnage and above and any other 
ships of 400 tons gross tonnage and ahove which are engaged in voyages to ports 
or offshore terminals under the jurisdiction of other Parties to the Convention. 
In the case of existing ships this requirement shall apply twelve months after 
the date of entry into force of the present Convention. 
(2) Such Certificate shall be issued either by the Administration or hy any 
persons or organization duly authorized by it. In every case the Administration 
ussumes full responsibility for the certificate. 
