Torvac have now completed the installation of a new 150mm Pre-Action Fire Sprinklers Systems at the Australian Museum. The system was installed to protect the Pacific store collection area, which is a collection of material culture, ethnography, history and archaeology of the Indigenous peoples of the Pacific region. The collection consists of over 60,000 ethnographic objects and is a major asset and great symbol of Australia’s close connection to the Pacific Islands and its people.
A Pre-Action Fire Sprinklers Systems is suitable for use in areas requiring that water be kept out of the sprinkler piping until an electric detecting device and a sprinkler have both been activated. The piping is filled with low pressure supervisory air to guard against accidental discharge due to sprinkler or pipe damage. Typical applications include Museums, Libraries, Archives, Computer rooms and cable/ transformer rooms.
There are two main sub-types of pre-action systems: single interlock, and double interlock.
Single Interlock Pre-Action Fire Sprinklers Systems
The operation of single interlock systems are similar to dry systems except that these systems require that a “preceding” fire detection event, typically the activation of a heat or smoke detector, takes place prior to the “action” of water introduction into the system’s piping by opening the pre-action valve, which is a mechanically latched valve (i.e. similar to a deluge valve). In this way, the system is essentially converted from a dry system into a wet system. The intent is to reduce the undesirable time delay of water delivery to sprinklers that is inherent in dry systems. Prior to fire detection, if the sprinkler operates, or the piping system develops a leak, loss of air pressure in the piping will activate a trouble alarm. In this case, the pre-action valve will not open due to loss of supervisory pressure, and water will not enter the piping.
Double Interlock Pre-Action Fire Sprinklers Systems
The operation of double interlock systems are similar to deluge systems except that automatic sprinklers are used. These systems require that both a “preceding” fire detection event, typically the activation of a heat or smoke detector, and an automatic sprinkler operation take place prior to the “action” of water introduction into the system’s piping. Activation of either the fire detectors alone, or sprinklers alone, without the concurrent operation of the other, will not allow water to enter the piping. Because water does not enter the piping until a sprinkler operates, double interlock systems are considered as dry systems in terms of water delivery times, and similarly require a larger design area.
If your property contains irreplaceable items or documents Torvac can assess your property’s unique needs and design, install and maintain your system to comply with all current Australian standards. Our installers are fully licensed with a minimum of 20 years experience.
Interested in talking to a Pre-Action Sprinkler System Specialist? Please contact us.