Systems PDF Print E-mail

Wet systems: 

Alarm valve detail.

Are the most common systems used in current days. It requires a permanent water supply, based on the Building Code. Also requires a back flow preventer (double check valve assembly), a shut off valve, an alarm device (could be an alarm valve or a riser check valve) and then the pipe system completed with additional alarm devices if necessary, depending on the complexity of the system. Those are only the basic components of a wet sprinkler system. The more complex the protected building is, the more complicated the sprinkler system is. The pipe ramification can also be classified in three big categories:

·     tree systems (fig.1)

·     loop systems (fig.2)

·     grid systems (fig.3)

As you can see in fig.1, fig.2 and fig.3 the names reflect the configuration of the pipes (branch lines in regards to feed and cross mains).

Observation: A wet pipe sprinkler system is permitted to supply an auxiliary dry pipe system, preaction system or deluge system.

Dry systems: 

It is a sprinkler system dedicated to protect areas exposed freezing conditions such unheated parking garages, loading docks and so on.

The system operates on a similar principal as a wet sprinkler system to some degree. One of the inconveniences of this system is the delay in water delivery at the open sprinkler heads.

To assure the delay is not affecting the efficiency of the system, NFPA # 13 recommends solutions of designing such systems in its dedicated articles.

Preaction & deluge systems

Preaction and deluge systems are particular dry pipe systems and are dedicated to small areas that need to be protected and in which accidental water release can create serious material loss. 



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