a pre-action system can be considered a single interlock and double interlock system depending on the system intentions and coverage. a single interlock system operates in a similar manner as the dry pipe system. this type of system has one event that must occur before water runs into the system; fire detection from a heat or smoke detector where the pre-action valve opens. a double interlock system has two events that must occur: 1) fire detection from a heat or smoke detector and 2) automatic sprinkler operation. once one of the above occurs, the pre-action valve operates, allowing water into the system piping, essentially turning a dry system into a wet system. these types of systems are regularly used where unintended activation is not desired such as information sensitive environments.
while walking through these spaces and observing the magnificent artwork and historical artifacts is fun for the patrons, designing the systems to protect them can be a significant challenge. the code does not specify exactly what type of system needs to be installed; instead, it directs the designer to nfpa 13, installation of sprinkler systems, to draft a code-compliant and functional system. in most light-hazard occupancies, the designer will go to work on a wet pipe sprinkler system and call it a day. a preaction system is a sprinkler system that consists of air-filled piping connected to the automatic sprinkler that is also tied into an automatic detection system located in the room being protected.
in order for water to be discharged from the sprinklers, the detection system must be activated and one or more of the sprinklers must also reach its activation temperature. for these systems, the piping will not become filled with water until both the sprinkler and detection system are activated. while either of these systems can be installed in a museum or art gallery, the single-interlock system is seen as the most desirable for those types of spaces. the primary use of the double-interlock preaction system is to protect freezer storage warehouse spaces where filling the pipe with water can be extremely costly. one of the primary advantages of the single-interlock system is that the water reaches the fire much more quickly than in a double-interlock system.
electric/pneumatic double interlocked preaction systems are commonly used as refrigerated area systems. they are also commonly used where flooding of the pipe viking electric/pneu-lectric double interlocked preaction systems utilize a viking deluge valve, pneumatic supervision of the automatic sprinkler system, a double interlock system has two events that must occur: 1) fire detection from a heat or smoke detector and 2) automatic sprinkler operation. once one of the, double interlock preaction system diagram, double interlock preaction system diagram, single interlock vs double interlock preaction system, double interlock preaction system sequence of operation, reliable single interlock preaction system.
nfpa 13 defines a preaction sprinkler system as “a sprinkler system employing automatic sprinklers interlock or double interlock, is installed. in a double interlock system the electric detection device has to be activated together with a fall in the maintained air pressure in the closed automatic the primary use of the double-interlock preaction system is to protect freezer storage warehouse spaces where filling the pipe with water can be, reliable double interlock preaction system, single interlock preaction system, double sprinkler system, non interlock preaction system, pre action sprinkler system testing, victaulic preaction valve, pre action panel, dry pipe sprinkler system, pre action sprinkler system valve, pre action deluge system.
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