AS 2118.3:2010 pdf free download – Automatic fire sprinkler systems Part 3: Deluge systems

AS 2118.3:2010 pdf free download – Automatic fire sprinkler systems Part 3: Deluge systems.
1.4 DEFINITIONS
For the purpose of this Standard, the definitions given in AS 2118.1, AS/N7.S 3500.0 and those below apply.
1.4.1 Deluge aIve
A quick-opening valve that is held in its normally closed position by inert gas, b air, or by liquid pressure. On the reduction of pressure, the deluge valve is opened by the upstream water pressure.
1.4.2 Foam
An aggregation of air-filled bubbles of lower specific gravity than atcr or flammable liquids. The foam is formed at the deflector plate of the open sprinkler and falls to the burning solids or flammable liquids, progressively removing heat and forming an air- excluding blanket of foam over the fuel. The foaiii produced by non-aspirating sprinklers is of lower expansion with higher fluidit3 and iiiore rapid foam solution drainage than that produced by air-aspirating sprinklers.
1.4.3 Foani concentrate
1.4.3.1 Aqueous flimforming foam (AFFF) concenirale
A foam concentrate that consists of a fluorinated surfactant with suitable foam stabilizers and additives, which act as a barrier to exclude air or oxygen and develop aqueous films on the fuel surface capable of suppressing the evolution of fuel vapours.
1 .4.3.2 FIn, formii,gfluoroproiein (FFFP) fiam concenirale
A foam concentrate that uses fluorinated surfactants to produce a fluid aqueous film for suppressing hydrocarbon fuel vapours. This type of foam also utilizes a protein base, plus stabilizing additives and inhibitors.
1.4.4 Foam solution
A mixture consisting of a foam concentrate in suitable proportions in either fresh or sa It water,
1.4. Foam/water sprinkler
I)ischarge device that is specially designed. open-type air-aspirating sprinklers, consisting of an open barrel-body foam maker that terminates in a deflector to shape the pattern of the foam or water issuing from the assembly. This device produces discharge patterns resembling those of spray pattern sprinklers when discharging at the same rates of flow.
1.4.6 Multiple jet control (MJC)
A thermally operated valve using a heat-sensitive element similar to those used in sprinklers. which holds the valve in the normally closed position. Destruction of the element by heat allows the valve to open. passing water or foam solution to the attached open sprinklers.
2.9.4 Deluge valve trini
Where sprinklers are used as detectors on either water or air-charged lines, the deluge valve trim arrangement shall he as shown in Figure 2.9.4 (a) and Figure 2.9.4 (h) respectively, or in accordance with the requirements of a listed syslem.
Where water charged lines are used in the detection system. the height of all parts of that system shall he checked to ensure that the head of water on the deluge valve actuating mechanism will not prevent it from operating.
2.9.5 Remote test valve
On piped detection systems, a remote test valve shall be located at the most remote end of air or gas charged systems or at the highest detector on water charged systems, to simulate the operation of a detector sprinkler.
An air gap shall be provided immediately downstream of the test valve to act as a vacuum breaker preventing a syphoning effect which could artificially reduce test operating times.
2.10 MULTIPLE JET CONTROLS (M.JCs)
Deluge systems using MJCs shall incorporate an alarm valve conforming to the requirements of AS 2118.1
Deluge systems using MJCs as the controlling mechanism shall, where practicable, have a manually operated bypass valve to pass water from the supply to the open sprinklers, as shown in Figure 2.10. The system shall be arranged so that, in the event of operation of any one MJC or bypass. sufficient water will flow to satisfy the whole system or zone.
2.11 DRAINAGE
The removal, treatnient and disposal of deluge system discharge shall take into consideration the requirements of the relevant authority.
NOTE: Facilities may he required for the retention, safe removal, treatment and disposal of the anticipated discharge from the deluge system in accordance with the requirements of the EPA and local authorities.
2.12 PIPE AND FITTINGS
Deluge systcm pipe and fittings not normalk filled with water or foam solution shall he hot-dip galvanized.