Deluge systems consist of open sprinklers connected to water supply through heat-responsive valve. Water is most widely used extinguishing substance, extinguishing by cooling. Three main types: fine water spray, sprinkler systems, and water spray systems. Fine water spray generates directional mist with internal atomization. Sprinkler systems use heat-sensitive bulbs that burst when temperature rises
11" W.C. is most common residential gas piping system. 1/2" copper tubing supports 110 BTUH at 10 feet. 3/4" copper tubing supports 348 BTUH at 10 feet. 1/2" iron pipe supports 291 BTUH at 10 feet. 3/4" iron pipe supports 608 BTUH at 10 feet