2 Definitions
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1272 – Guidelines for the Approval of Fixed Water-based Fire-fighting Systems for Ro-Ro Spaces and Special Category Spaces Equivalent to that Referred to in Resolution A.123(V) – (4 June 2008)1 - Annex – Guidelines for the Approval of Fixed Water-based Fire-fighting Systems for Ro-Ro Spaces and Special Category Spaces Equivalent to that Referred to in Resolution A.123(V) - 2 Definitions

2 Definitions

  2.1 Area of operation is a design area for wet-pipe, automatic sprinkler system (to be determined for each system by the test procedure described in the appendix to these Guidelines).

  2.2 Deluge system, automatic and manual release is a system employing open nozzles attached to a piping system connected to a water supply through a valve that can be opened by signals from a fire detection system and by manual operation. When this valve is opened, water flows into the piping system and discharges from all nozzles attached thereto.

  2.3 Deluge system, manual release is a system employing open nozzles attached to a piping system connected to a water supply through a valve that is opened by manual operation. When this valve is opened, water flows into the piping system and discharges from all nozzles attached thereto.

  2.4 Dry pipe system is a system employing automatic sprinklers attached to a piping system containing air or nitrogen under pressure, the release of which (as from the opening of a sprinkler) permits the water pressure to open a valve known as a dry pipe valve. The water then flows into the piping system and out of the opened sprinklers.

  2.5 Fire control limits the size of a fire by distribution of water so as to decrease the heat release rate, while controlling gas temperatures and pre-wetting adjacent combustibles and/or reducing heat radiation to avoid structural damage.

  2.6 Fire suppression is the sharp reduction of the heat release rate of a fire and the prevention of regrowth.

  2.7 Preaction system is a system employing automatic sprinklers attached to a piping system containing air that may or may not be under pressure, with a supplemental detection system installed in the same area as the nozzles or sprinklers. Actuation of the detection system opens a valve that permits water to flow into the piping system and to be discharged from any sprinklers that have operated.

  2.8 Water-based extinguishing medium is fresh water or seawater with or without additives mixed to enhance fire-extinguishing capability.

  2.9 Wet pipe, automatic sprinkler system is a system employing automatic sprinklers attached to a piping system containing water and connected to a water supply so that water discharges immediately from sprinklers opened by heat from a fire.

Parent topic: Annex – Guidelines for the Approval of Fixed Water-based Fire-fighting Systems for Ro-Ro Spaces and Special Category Spaces Equivalent to that Referred to in Resolution A.123(V)
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