281 



(5) Oil Record Books shall be kept in such a place as to be readily available 

 for inspection at all reasonable times and, except iu the case of unmanned ships 

 under tow, shall be Sept on board the ship. They shall be preserved for a period 

 of two years after the last entry has been made. 



(6) The competent authorities of a Contracting Government may inspect on 

 board any ship to which the present Convention applies while within a port or 

 at any loading terminal under its jurisdiction the Oil Record Book required to 

 be carried in the ship in compliance with the provisions of this Regulation, and 

 may make a true copy of any entry in that book and may require the master of 

 the ship to certify that the copy is a true copy of such entry. Any copy so made 

 which purports to have been certified by the master of the ship as a true copy 

 of an entry in the ship's Oil Record Book shall be made admissible in any judi- 

 cial proceedings as evidence of the facts stated in the entry. Any action by the 

 competent authorities under this paragraph shall be taken as expeditiously as 

 possible and the ship shall not be unduly delayed. 



Chapter III — Requirements for Minimizing Oil Pollution From Oil 

 Tankers Due to Side and Botton Damages 



regul.4tion 22. damage assumptions 



For the purpose of calculating hyjiothotical oil outflow from oil tankers, three 

 dimensions of the extent of damage of a parallelepi])ed on the side and bottom of 

 the ship are assumed as follows. In the ease of bottom damages two conditions are 

 set forth to be applied individually to the stated portions of the oil tanker. 

 (a) Side damage: 



(i) Longitudinal extent (7^): 'sL^/^ or 14.5 metres, whichever is less, 

 (ii) Transverse extent (Ic)'- B/h or 11.5 metres, whichever is less. 

 (Inboard from the ship's side at right angles to the centreline 

 at the level of the summer load line.) 

 (iii) Vertical extent (v^) : from the base line upwards without limit. 

 (h)'Bollom damage: For 0.3L from the forward perpendicuhxr of ship; any other 

 part of ship. 



(i) Longitudinal extent (/,) : L/10; L/10 or 5 metres, whichever is less, 

 (ii) Transverse extent (/,) : B/6 or 10 metres, whichever is less but not 



less than .") metres; .'> metres, 

 (iii) Vfsrtical extent from the base line (v^) : B/\') or (5 metres, whichever 

 is less. 



REGULATION 23. HYPOTHETICAL OUTFLOW OF OIL 



(1) The hypothetical outflow of oil in the case of side damage (Or) and bottom 

 damage (0,) shall be calculated l)y the following formulae with respect to com- 

 partments breached by damage to all conceivable locations ahrng the length of 

 the ship to the extent as defined in Regulation 22 of this .\nnex. 



(a) ff )r side damages : 



0e = STF, + 2A\Ci (I) 



(b) for bott<mi damages: 



0, = 'i(2Z,ir, + 2Z,C,) (II) 



where : 



IF, = volume (jf a wing tank in cubic metres assumed to be l)reached by the 



damage as sjiecitied iu Regulation 22 of this Annex; Wi for a segre- 

 gated ballast tank may l^e taken equal to zero, 

 C, = volume of a centre tank in cubic metres assumed to be l)reached by the 



damage as specifled in Regylation 22 of this Annex; C; for a segregated 



ballast tank may be taken equal to zero, 

 K,— \ — (bi/tc) ; when 6, is equal to or greater than tr, iv, shall be taken eciual 



to zero, 

 Zi= 1 — {hiji\) ; when hi is equal to or greater than v^, Zi shall be taken equal 



to zero, 

 6, = width of wing tank in metres under consideration, 

 /ii = minimum depth of the double bottom in metres under consideration; 



where no double bottom is fitted hi shall be taken equal to zero, 

 <c = transverse extent of side damage as defined in Regulation 22 of this 



Annex. 

 ?;, = vertical extent of bottom damage as defined in Regulation 22 of this 



Annex. 



