What's the difference between a wet and dry fire sprinkler system?
Answer:
A wet sprinkler system has pressurized water inside the system 24/7 for extinguishing a fire.
A dry sprinkler system has pressureized air or nitrogen inside the piping. This keeps the dry-valve closed, and water out of the system. When a sprinkler fuses, it allows the air to escape; then the dry valve opens and allows water to enter the system. wherever there is an opened sprinkler, water will flow through it and put out the fire.
Dry systems are used in areas where water filled piping could freeze, such as unheated warehouses, freezers, unheated buidlings, etc.
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