Regulation 12 – Peak and Machinery Space Bulkheads, Shaft Tunnels, etc.
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Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.429(98)/Rev.2 - Revised Explanatory Notes to the SOLAS Chapter II-1 Subdivision and Damage Stability Regulations - (adopted on 11 November 2020) - Annex - Revised Explanatory Notes to the SOLAS Chapter II-1 Subdivision and Damage Stability Regulations - Part B - Guidance on Individual SOLAS Chapter II-1 Subdivision and Damage Stability Regulations - Regulation 12 – Peak and Machinery Space Bulkheads, Shaft Tunnels, etc.

Regulation 12 – Peak and Machinery Space Bulkheads, Shaft Tunnels, etc.

Regulation 12.6.1

For cargo ships, for which the building contract is placed on or after 1 January 2020 and which are constructed before 1 January 2024, the following figures show examples of suitable butterfly valve arrangements:

 
Figure 1
 
 
Figure 2

As butterfly valves must be capable of being remotely operated the following shall apply:

  • .1 the actuator shall be of a double acting type;

  • .2 when subject to loss of power, the actuator shall remain in its current position; and

  • .3 when subject to loss of power, the valve shall be able to be manually operated.

Regulation 12.10

1 In cargo ships the after engine-room bulkhead can be regarded as the afterpeak bulkhead provided that the after peak adjoins the engine-room.

2 In cargo ships with a raised quarter deck, it may be impracticable to extend the afterpeak bulkhead to the freeboard deck as the freeboard deck does not extend to the aft perpendicular. Provided that the afterpeak bulkhead extends above the deepest load line, and that all rudderstock bearings are housed in a watertight compartment without open connection to spaces located in front of the afterpeak bulkhead, termination of the afterpeak bulkhead on a watertight deck lower than the freeboard deck can be accepted by the Administration.

Regulation 12.11

In cargo ships a stern tube enclosed in a watertight space of moderate volume, such as an afterpeak tank, where the inboard end of the stern tube extends through the afterpeak/engine-room watertight bulkhead into the engine-room, is considered to be an acceptable solution satisfying the requirement of this regulation, provided the inboard end of the stern tube is effectively sealed at the afterpeak/engine-room bulkhead by means of an approved watertight/oiltight gland system.

Parent topic: Part B - Guidance on Individual SOLAS Chapter II-1 Subdivision and Damage Stability Regulations
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