The National Fire Protection Agency (NFPA) defines a Dry Sprinkler System as, "a sprinkler system employing automatic sprinklers attached to a piping system containing air or nitrogen under pressure, the release of which (as from the opening of a sprinkler) permits the water pressure to open a valve known as a dry pipe valve, and the water then flows into the piping system and out the opened sprinklers."

Dry Pipe Systems are similar to Wet Pipe Systems with one big difference- the pipe is not always filled with water. In Dry Pipe Systems, water is held behind a dry pipe valve, and water is released when a drop in pressure causes the dry pipe valve to open.

Heat causes the glass bulb or fusible link of the sprinkler to break, air is released from the open sprinkler head, the drop in pressure causes the dry pipe valve to open and water fills the system.

The size of Dry Pipe Systems is limited due to the delay between sprinkler operation and water flow.

Dry Sprinkler Systems are ideal in applications where the space is unconditioned and temperatures are unable to consistently be kept above 40 degrees F (4 degrees C).

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