Definitions
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC/Circular.668 – Alternative Arrangements For Halon Fire-extinguishing Systems In Machinery Spaces And Pump-rooms – (Adopted on 22 December 1994)Amended by MSC/Circular.728 - Annex - Guidelines for the Approval of Equivalent Water-Based Fire-extinguishing Systems as Referred to in SOLAS 74 for Machinery Spaces and Cargo Pump-rooms - Definitions

Definitions

  2 Antifreeze System. A wet pipe system containing an antifreeze solution and connected to a water supply. The antifreeze solution is discharged, followed by water, immediately upon operation of nozzles.

  3 Deluge System. A system employing open nozzles attached to a piping system connected to a water supply through a valve that is opened by the operation of a detection system installed in the same areas as the nozzles or opened manually. When this valve opens, water flows into the piping system and discharges from all nozzles attached thereto.

  4 Dry Pipe System. A system employing nozzles attached to a piping system containing air or nitrogen under pressure, the release of which (as from the opening of a nozzle) 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 nozzle.

  5 Fire Extinction. A reduction of the heat release from the fire and a total elimination of all flames and glowing parts by means of direct and sufficient application of extinguishing media.

  6 Preaction System. A system employing automatic nozzles 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. Actuation of the detection system opens a valve that permits water to flow into the piping system and to be discharged from any nozzles that may be open.

  7 Water-Based Extinguishing Medium is fresh water or seawater with or without additives mixed to enhance fire-extinguishing capability.

  8 Wet Pipe System. A system employing nozzles to a piping system containing water and connected to a water supply so that water discharges immediately from the nozzles upon system activation.

Parent topic: Annex - Guidelines for the Approval of Equivalent Water-Based Fire-extinguishing Systems as Referred to in SOLAS 74 for Machinery Spaces and Cargo Pump-rooms
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