Wet facilities

The system can only be used in heated rooms, as the water in the pipes will freeze in the cold. As described above where the pipes are filled with water under pressure, and extinguishing starts immediately after a sprinkler head has tripped. The system is easy to adapt in the room, the pipes can be completely under the ceiling and the heads hang down. 

Pipe types

The pipe network for sprinkler systems is usually laid with steel pipes, either untreated or galvanized. Copper pipes have also been used with good results. Untreated steel pipes and stainless steel pipes are possible to weld together sections in the workshop, and mount on site with couplings. In many cases, this results in smoother piping.  Suspension of sprinkler pipes must follow separate rules, there can be a large load on the pipes during a sprinkler release.

Sprinkler nozzles

There are many different sprinkler heads to choose from. Most types of heads can be used on wet sprinkler systems. You can choose heads that stand above the pipe, or hang under the pipe, or the side throw nozzles that are mounted on the side of the pipe.

Water supply

 for churches will normally

The water requirement is 700 – 1000 liters per minute. If the church is to have external sprinklers on walls and ceilings, the demand will increase. Normally, the pressure on the main water line will be sufficient for the sprinkler system. In some places the tower is very high and then a higher pressure is required to get the water up.  Example: a church tower that is 30 meters high requires 3 bar pressure to lift the water up to the top. If the sprinkler head is to have 0.5 bar to give a sufficient effect, we must expect a resistance in the pipes of 1 bar. This means that the water source must provide 4.5 bar when the bottling is 700 liters per. Minute.  If the waterworks cannot provide sufficient pressure, a simple pump solution can be connected. If you need a pump, the ns12845 requires a minimum of 2 independent pumps, so that the extinguishing system will function optimally even if the power goes out or one pump stops working. 

Sprinkler Central

A wet system has the simplest solution for the sprinkler systems. The water intake from the municipality / possibly other sources is up to the shut-off valve, above this flap the pipe network is filled with water with a slightly higher pressure so that the flap is kept down. A pressure gauge is connected which monitors that there is the correct pressure above the shut-off valve, and an alarm is connected which warns if the pressure drops due to a fault or sprinkler trip. The sprinkler room also has a shut-off valve and drain valve for the system. 


  • Sprinkler systems have been in use for over 100 years, experience shows that it controls / extinguishes fire in 95% of fires. 
  • Provides good moisture around the fire site. 
  • The plant is simple in operation and requires simple supervision.
  • Built according to international empirical rules where all material is approved by reputable test laboratories, and all approved sprinkler material is equivalent and can be mixed at the same facility. 
  • The sprinkler heads have a nozzle opening of 10 mm and therefore can withstand some contamination in the water. 
  • Rare troubleshooting. When it occurs, it is most often due to lack of supervision. 


  • Sprinkler systems require a lot of water, and relatively large pipe dimensions in the building 
  • Large capacity on main water pipeline, or expensive water supply systems. 
  • May cause major water damage due to incorrect tripping.

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