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are the most common systems used in current days. It requires a permanent water supply, based on the Building Code, 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:
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.
