Page 239 - International safety guide for oil tankers and terminals

SHIPBOARD OPERATIONS

the berth and to include the ballast weights in the hull stress
calculations.
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11.6.6.2 Discharging Segregated Ballast to Shore
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
Some terminals require that segregated ballast is discharged into
shore tanks to meet environmental restrictions. On tankers with
segregated ballast, this requires the cross-connection of the cargo
and ballast systems, with the attendant risk of contamination
between the systems unless a deck manifold for ballast is fitted.

Operators should produce carefully considered procedures for
managing this operation, which should address the following
issues:

Fitting of cross-connection.
Loading and deballasting sequence.
Draught and air draught requirements.

Hull stress management.
Cargo line setting procedure.
Cargo pump operation.
Segregation of ballast and cargo.
ึ
Ballast tank draining.

Removal of cross-connection and isolation of the systems.

11.6.7 Ballast Water Exchange at Sea

The 2004 International Convention for the Control and Management of
Ships’ Ballast Water and Sediments has been adopted by IMO to prevent
the spread of harmful aquatic organisms carried by ships’ ballast water.
Upon entry into force, this Convention will require all ships to implement a
Ballast Water and Sediments Management Plan. Some countries have
introduced specific requirements for ballast water management and
reporting, within their national limits, prior to the Convention coming into
force. Where ballast water exchange at sea is the method of compliance
with regulations, the overall design, strength and stability of the ship
should be sufficient to permit its safe execution in the weather conditions
prevailing. Emptying and filling of tanks at sea, if not carefully managed,
may lead to reduced stability, high stresses, sloshing, or excessive trim
and reduced draughts. The ship’s Ballast Water Management Plan should
set out the procedures to be followed, and precautions to be taken, to
allow this operation to be conducted safely.

11.6.8 Discharging Cargo Tank Ballast at Sea

All cargo tank ballast discharged at sea must be discharged in
accordance with MARPOL.

© ICS/OCIMF/IAPH 2006 205