How Does a Dry Pipe Sprinkler System Work?

According to the NFPA 13 standard, a dry pipe sprinkler system is one that uses automatic sprinklers connected to a piping network with pressurized air or nitrogen instead of water. Pressure holds back water thanks to a dry pipe valve, which is a special type of valve designed for this application. The pressure is released when one of the sprinkler heads activates, opening the dry pipe valve and allowing water into the sprinkler piping. For comparison, a wet-pipe system is permanently filled with water, which is released as soon as one sprinkler head opens.

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