In such location where climate is extreme cold, water in the wet pipe sprinkler system may get freeze & may become in effificient in case of use when fire broke. In such case pipes of sprinkler systems need to keep dry. In this system pipes are filled with air opposed to water. This dry pipe system is design in such a way that when sprinkler heads are gets activated, water flows through pipes due to reducing pressure of air. These types of systems are more complex, so the cost of installation is also high. This system is design in such a way that water gets discharge from any of activated sprinkler in 60 Seconds.