This system is used in a non heated space. Parking garages, warehouses, carports and so on. The system has pressurized air in the pipeing from the sprinlker head to the water source. Water does not enter the system untell a sprinkler head is set off.
NO, NFPA 25chapter 5, sprinkler pipe shall be free of external load
Wet pipe sprinkler
about 500
Below given list based on a determination specific needs.Wet Fire Sprinkler SystemsDry Pipe SystemsPreaction SystemsDeluge Sprinkler SystemAnti-Freeze Sprinkler System
Being a licensed master plumber and a licensed master fire suppression piping contractor all I can say if a dry system has no air pressure YOU HAVE MAJOR problems and need to have the air pressure replenished
The most common fire sprinkler system is a wet pipe system wich always has water in it. The sprinkler heads have a heat sensitive element, most commonly a glass bulb filled with liquid that expand when exposed to heat, after a certain temperature is met , usually 160 degrees or more the glass bulb breaks and allows water to flow on the fire in a uniform water density. The sprinkler system may have an alarm device that sounds an audible alarm in the building, and/or call the fire department. The system may have a connection for the fire department to add to the automatic water supply. there are other types of systems, dry-pipe, preaction, and others which are similar but do not have water in the piping initally due to concerns of freezing water in the system, or sensitive areas where accidental water damage would be a greater problem than fire.(museums, computer rooms, etc)
Automatic Sprinkler of Connecticut LLC specializes in the simplest and most cost-effective types of automatic fire sprinkler systems, wet pipe sprinklers. Wet pipe sprinklers are the most common type of sprinkler system and are very reliable. They use water from a pressurized supply line to activate the sprinklers in case of smoke or heat detection, quickly suppressing any fires while minimizing damage.
An automatic sprinkler system is a system in which sprinkler heads are fixed in piping system were pipe is fully filled with water or air under pressure and, at a certain calibrated temperature, sensing elements in sprinkler head breaks and allows water flow. Other types of systems rely upon electrical sensors (smoke and heat sensors, or manual switches) to initiate the flow or to pressurize the pipe so that sprinkler heads activated by the heat will flow water. Somewhat more rare systems, for extremely high hazards such as rubber tire storage in a warehouse, may have sprinkler heads that are always "open", allowing the entire room to be flooded when the pipe is pressurized.
If the pipe is metal try a metal detector. If plastic, get out your shovel.
The heat of the fire causes sprinklers to trip, releasing nitrogen or some other gas held under pressure in the system through the sprinklers. This action activates a dry pipe valve within the sprinkler system which releases fire protection water which has been restrained within the system, through the sprinklers with the intention of dousing if not extinguishing the fire.
A sprinkler system, chairs, I made a soccer goal once. Or a trebuchet, check this out. http://www.ehow.com/how_7561918_make-pvc-pipe-trebuchet.html
Either one CAN be used. Galvanized would be preferred in an environment high in chlorine or corrosive materials. Normally though, black pipe, or carbon steel, is used for fire protection because it is much cheaper.