Section 3: Description of the Systems connected to the Dedicated Clean Ballast Tanks

  3.1.1 There are four centre and six pairs of wing tanks. The dedicated clean ballast is to be carried in No. 2 centre and No 4 centre and Permanent ballast in No. 3 wings. No. 8 wings are the slop tanks.

  3.1.2 Cargo is handled by three main cargo oil pumps each connected to its own suction and discharge main. No. 1 pump is used to discharge the port slop and centre tanks, No. 2 pump to discharge No. 1 and No. 4 wing tanks and No. 3 pump to discharge the starboard slop and No. 2 and No. 5 wing tanks. All three pumps are suitably interconnected by cross-overs both on the suction and discharge piping.

  3.2.1 There is no separate stripping system for the cargo tanks. A jet strip system is used for stripping through an auxiliary stripping suction, taken off the main suction branch.

  3.2.2 The jet strip system consists of two eductors connected to No. 1 and No. 3 cargo oil suction mains with a cross-connexion to No. 2 suction main. The eductors discharge to the slop tank or No. 4 centre tank.

  3.2.3 A reciprocating stripping pump is provided with direct suction to each slop tank, No. 4 centre tank and the suction cross-connexion to the cargo oil pumps. The stripping pump discharges to the starboard slop tank, outboard of the manifold valves, and to each cargo discharge main.

  3.3.1 Permanent ballast is carried in No. 3 wings and is handled by a separate system with its own pumping and piping installation.

  3.4.1 No. 2 and No. 4 centre tanks are designated as the dedicated clean ballast tanks. The ballasting and discharging of these tanks will be accomplished with No. 1 cargo oil pump.

  3.4.2 The ballasting will be achieved using the port side sea suction through No. 1 discharge main over the deck and through the direct filling drop into No. 1 suction main. Simultaneous ballasting and discharging of cargo from the wing tanks is not permissible.

  3.4.3 The discharge of ballast will be achieved using No. 1 suction main and discharging through the cross-over in the pump-room into the starboard side sea suction. Simultaneous operation of discharging ballast and loading cargo is not permissible.

  3.5.1 Due to the limitation of the systems the following restrictions on the operations will apply:

• .1 The CBT ballast must be discharged before the loading of cargo.

• .2 The discharge of cargo is to be completed before the loading of CBT ballast.

• .3 Permanent ballast in No. 3 wings may be loaded or discharged at any time.