As for the controls of fixed carbon dioxide fire-extinguishing systems, amended by the Resolution MSC.256(84) at IMO MSC84 on May 2008, please be informed as follows.

1. Revised regulation
By the first scheduled dry-docking after 1 January 2010, fixed carbon dioxide fire-extinguishing systems for the protection of machinery spaces and cargo pump-rooms on ships constructed before 1 July 2002 shall comply with the provisions of paragraph 2.2.2 of chapter 5 of the Fire Safety Systems Code.
The ships constructed on or after 1 October 1994 have been already applied the requirement, since ClassNK Rules have adopted the below requirement.


[Chapter 5 2.2.2 Controls, FSS code]
Carbon dioxide systems shall comply with the following requirements:
- 1 two separate controls shall be provided for releasing carbon dioxide into a protected space and to ensure the activation of the alarm. One control shall be used for opening the valve of the piping which conveys the gas into the protected space and a second control shall be used to discharge the gas from its storage containers; and
- 2 the two controls shall be located inside a release box clearly identified for the particular space. If the box containing the controls is to be locked, a key to the box shall be in a break-glass-type enclosure conspicuously located adjacent to the box.