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6.6 Discharge Performance

Discharge performance is another key performance requirement for traditional automatic glass bulb activated sprinklers. The Assumed Maximum Area of Operation (AMAO) of the suppression system defines how many nozzles are expected to operate in the event of a fire.

'For domestic occupancies, the system should be capable of providing pressures and flow rates to permit all the watermist nozzles in the fire test room or largest compartment, whichever is the greater, up to a maximum area of operation (AMAO) of 64 sqm, to operate simultaneously’.

Because glass bulbs are thermally activated, they cannot be controlled. It therefore must be assumed, as a worse case scenario, that several nozzles in the vicinity of the fire will activate, generating more water demand from the supply system than that observed in the fire test. The AMAO (Assumed Maximum Area of Operation) is this worse case scenario requirement.

Automist is a pre-engineered system that has a predetermined flow rate, nozzle pressure, and water quantity regardless of the installation to eliminate the need for hydraulic calculations or AMAO. This is possible because Automist is electronically controlled which ensures that only one nozzle (the best positioned to tackle the fire) activates. Therefore the system will always output only 6 litres per minute. The lower water consumption removes the need for a tank and allows the water supply to come directly from the domestic mains, increasing the reliability of the supply because it is intrinsically linked to the availability of daily domestic use water and within the typical flow of a domestic water consuming device (like a tap or shower).

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