1 Watertight Bulkhead Arrangement

1.1 Number and disposition of watertight bulkheads

1.1.1 All ships are to have at least the following transverse watertight bulkheads:

a) One collision bulkhead.
b) One aft peak bulkhead.
c) One bulkhead forward of the machinery space, and one bulkhead at the aft end of the machinery space which may be the aft peak bulkhead.

1.1.2 In the case of ships with an electrical propulsion plant, both the generator room and the engine room are to be enclosed by watertight bulkheads.

1.1.3 In addition to the requirements of [1.1.1] and [1.1.2], the number and disposition of bulkheads are to be arranged to suit the requirements for subdivision, floodability and damage stability, and are to be in accordance with the requirements of national regulations.

1.1.4 For bulk carriers less than 150 m in length not required to comply with subdivision requirements, bulkheads not less in number than indicated in Table 1 are to be fitted.

Table 1 : Number of bulkheads for bulk carriers less than 150 m in length

Length in m	Number of bulkheads for ships with aft machinery ⁽¹⁾
90 ≤ L < 105	4
105 ≤ L < 120	5
120 ≤ L < 145	6
145 ≤ L < 150	7
⁽¹⁾ Aft peak bulkhead and aft machinery bulkhead are the same.

1.1.5 The bulkheads in the cargo hold region are to be spaced at uniform intervals as far as practicable.

1.2 Openings in watertight bulkheads

1.2.1 The number of openings in watertight bulkheads is to be kept a minimum, where penetrations of watertight bulkheads and internal decks are necessary for access, piping, ventilation, electrical cables. Arrangements are to be made to maintain the watertight integrity.

1.2.2 The tightness, operability and indication of the doors in watertight bulkheads are to be in accordance with Ch II-1, Reg 13-1 of SOLAS Convention, as amended.