4 Illustrations of segregation of cargo transport units on board ro-ro ships
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1440 – Illustrations of Segregation of Cargo Transport Units on Board Containerships and RO-RO Ships – (1 June 2012) - Annex – Illustrations of Segregation of Cargo Transport Units on Board Containerships and Ro-Ro Ships - 4 Illustrations of segregation of cargo transport units on board ro-ro ships

4 Illustrations of segregation of cargo transport units on board ro-ro ships

  4.1 The illustrations of this section apply to the segregation of cargo transport units which are transported on board roll-on/roll-off ships or in roll-on/roll-of cargo spacesfootnote.

  4.2 To determine locations in which cargo transport units are not permitted to contain dangerous goods that are incompatible with those in a reference cargo transport unit, the following method applies: locations where incompatible dangerous goods are not permitted with respect to the referenced cargo transport unit are first determined in the direct fore and aft and athwartships directions. The relevant segregation distances to be considered in both directions are defined in metres as shown in the figure. Cargo transport units located partially or completely within these distances from the reference cargo transport unit shall not contain dangerous goods that are incompatible with those in the reference cargo transport unit.

  4.3 The standard dimension of a cargo transport unit used for the illustrations is:

length: 12 m
width: 2.50 m

  4.4 Explanation of the segregation terms

Note 1:

 All bulkheads and decks shall be resistant to fire and liquid.

Note 2:

When an illustration has more than one reference cargo transport units, only one should be used when interpreting the illustration. When an illustration contains several reference cargo transport units, they have to be considered as different examples.

“AWAY FROM” .1
CLOSED VERSUS CLOSED
OR
CLOSED VERSUS OPEN
ON DECK UNDER DECK
FORE AND AFT No restriction No restriction
ATHWARTSHIPS No restriction No restriction

1 Situations closed versus closed and closed versus open

Note All bulkheads and decks shall be resistant to fire and liquids.

“AWAY FROM” .1
OPEN VERSUS OPEN ON DECK UNDER DECK
FORE AND AFT At least 3 metres At least 3 metres
ATHWARTSHIPS At least 3 metres At least 3 metres

1 Situation open versus open

Note All bulkheads and decks shall be resistant to fire and liquids.

"SEPARATED FROM" .2
CLOSED VERSUS CLOSED ON DECK UNDER DECK
FORE AND AFT At least 6 metres At least 6 metres or ONE bulkhead
ATHWARTSHIPS At least 3 metres At least 3 metres or ONE bulkhead

2 Situation closed versus closed

Note All bulkheads and decks shall be resistant to fire and liquids.

"SEPARATED FROM" .2
OPEN VERSUS OPEN ON DECK UNDER DECK
FORE AND AFT At least 6 metres At least 6 metres or ONE bulkhead
ATHWARTSHIPS At least 3 metres At least 6 metres or ONE bulkhead

2 Situation closed versus open

Note All bulkheads and decks shall be resistant to fire and liquids.

"SEPARATED FROM" .2
OPEN VERSUS OPEN ON DECK UNDER DECK
FORE AND AFT At least 6 metres At least 12 metres or ONE bulkhead
ATHWARTSHIPS At least 6 metres At least 12 metres or ONE bulkhead

2 Situation open versus open

Note All bulkheads and decks shall be resistant to fire and liquids.

"SEPARATED BY A COMPLETE COMPARTMENT OR HOLD FROM" .3
CLOSED VERSUS CLOSED ON DECK UNDER DECK
FORE AND AFT At least 12 metres At least 24 metres + deck
ATHWARTSHIPS At least 12 metres At least 24 metres + deck

3 Situation closed versus closed

Note All bulkheads and decks shall be resistant to fire and liquids.

"SEPARATED BY A COMPLETE COMPARTMENT OR HOLD FROM" .3
CLOSED VERSUS OPEN ON DECK UNDER DECK
FORE AND AFT At least 24 metres At least 24 metres + deck
ATHWARTSHIPS At least 24 metres At least 24 metres + deck

3 Situation closed versus open

Note All bulkheads and decks shall be resistant to fire and liquids.

"SEPARATED BY A COMPLETE COMPARTMENT OR HOLD FROM" .3
OPEN VERSUS OPEN ON DECK UNDER DECK
FORE AND AFT At least 36 metres Two decks or TWO bulkheads
ATHWARTSHIPS Prohibited Prohibited

3 Situation open versus open

Note All bulkheads and decks shall be resistant to fire and liquids.

"SEPARATED LONGITUDINALLY BY AN INTERVENING COMPLETE COMPARTMENT OR HOLD FROM" .4
CLOSED VERSUS CLOSED ON DECK UNDER DECK
FORE AND AFT At least 36 metres Two bulkheads or at least 36 metres
+
two decks
ATHWARTSHIPS Prohibited Prohibited

4 Situation closed versus closed

Note All bulkheads and decks shall be resistant to fire and liquids.

"SEPARATED LONGITUDINALLY BY AN INTERVENING COMPLETE COMPARTMENT OR HOLD FROM" .4
CLOSED VERSUS OPEN ON DECK UNDER DECK
FORE AND AFT At least 36 metres At least 48 m including TWO bulkheads
ATHWARTSHIPS Prohibited Prohibited

4 Situation closed versus open

Note All bulkheads and decks shall be resistant to fire and liquids.

"SEPARATED LONGITUDINALLY BY AN INTERVENING COMPLETE COMPARTMENT OR HOLD FROM" .4
CLOSED VERSUS OPEN ON DECK UNDER DECK
FORE AND AFT At least 48 metres Prohibited
ATHWARTSHIPS Prohibited Prohibited

4 Situation open versus open

Note All bulkheads and decks shall be resistant to fire and liquids.


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