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Automatic Fire Sprinkler (pre-action) System

Automatic Fire Sprinkler (pre-action) System

A pre-action fire sprinkler system is a type of automatic fire sprinkler system designed to provide fire suppression while minimising false alarms and unwarranted water damage.

Unlike traditional wet pipe systems, the pipes in a pre-action system do not contain water; instead, water is held back by a pre-action valve. This valve is electrically operated by a combination of a fire detection and alarm system signal from a heat detector, smoke detector, or flame detector and a low air-pressure caused by the activation of a sprinkler head.

The activation process of a pre-action sprinkler system involves several steps:

  1. Fire Detection: Upon detecting a fire, the pre-action valve is triggered and opens. This action allows water to flow into the otherwise dry sprinkler pipes, effectively converting the system into a wet pipe system at this stage.
  2. Individual Sprinkler Activation: Despite water filling the pipes, it is not immediately released. Each fire sprinkler head must be individually activated by the heat from the fire. Water is discharged only from the sprinkler heads that detect sufficient heat, targeting the affected area precisely.

This operation method ensures that water is released only when a fire is genuinely present, thereby offering a high level of protection against accidental water discharge. The pre-action fire sprinkler system is ideal for use in environments where water damage needs to be strictly avoided, such as data centres, archives, and museums.


    In preparing this definition, we have drawn from various sources including Legislation, Codes, Standards and industry information, research and knowledge.  Like the english language, these definitions may subtly change from time to time. As such these definitions are provided solely on the basis that users will be responsible for making their own assessment of the definition and and are advised to verify all relevant representations, statements and information.