557 



permit operation in tlie manner permitted in sub-paragra]3lis (-i) (a) 

 and (b) of this Regulation may be accepted. 



(3) In ne-^ oil tankers means shall be provided for stopping the 

 discharge of effluent into the sea from a position on upper deck or 

 above located so that the manifold in use referred to in paragraph 

 (1) of this Regulation and the effluent from the pipelines referred to 

 in paragraph (2) of this Regulation may be Usually observed. Means 

 for stopping the discharge need not be provided at the observation 

 position if a positive communication system such as telephone or radio 

 system is provided between the observation position and the discharge 

 control position. 



(4) All discharges shall take place above the waterline except as 

 follows : 



(a) Segregated ballast and clean ballast may be discharged 

 below the waterline in ports or at offshore terminals. 



(b) Existing ships which, without modification, are not capable 

 of discharging segregated ballast above the waterline may dis- 

 charge segregated ballast below the waterline provided that an 

 examination of the tank immediately before the discharge has 

 established that no contamination with oil has taken place. 



REGULATION 19 



Standard Discharge Connection 



To enable pipes of reception facilities to be connected with the ship's 

 discharge pipe line for residues from machinery bilges, both lines 

 shall be fitted with a standard discharge comiection in accordance 

 with the following table: 



Staxdard DrMExsiojfS of Flanges for Discharge Coxxecttoxs 



DESCRIPTION DLMEXSIGN 



Outside diameter. 215 mm. 



Inner diameter. According to pipe outside diam- 



eter. 



Bolt circle diameter. 183 mm. 



Slots in flange. 6 holes 22 mm in diameter equi- 



distantly placed on a bolt circle 

 of the above diameter, slotted 

 to the flange periphery. The slot 

 width to be 22 mm. 



Flange thickness. 20 mm. 



Bolts and nuts: quantity, diam- 6, each of 20 mm in diameter and 

 eter. of suitable length. 



The flange is designed to accept pipes up to a maximum internal 

 diameter of 125 mm and shall be of steel or other equivalent material 

 having a flat face. This flange, together with a gasket of oilproof mate- 

 rial, shall be suitable for a service pressure of 6 kg/cm-. 



REGULATIOX 20 



Oil Record Booh 



(1) Every oil tanker of 150 tons gross tonnage and above and every 

 ship of 400 tons gross tonnage and above other than an oil tanker shall 



