Standpipe (firefighting)

A riser is the afferent transport of water, gas, or electricity serving in or on buildings for fire protection or supply engineering piping or electrical conduit - in buildings mostly from the (often lying in the house connection ) each house connection starting and the respective main line vertically in the various projectiles continuing.

Supply Technology

In the domestic hot water system all lines that are diverted by the distributor and perpendicular lead to the floors, riser. After the corresponding installation regulations of DIN 1988 all risers must be individually lockable and drainable.

Fire protection

Risers in fire protection are basically classified into three different categories.

Riser dry

They are used solely for use by the fire service and are useless for amateurs. According to DIN 14462 is a dry riser from a fire-fighting water supply, which are usually freely available is located in the entrance area. Furthermore, it is mostly per floor to arrange at least one discharge fitting. At the end of each riser string a air valves is to be set in order to avoid pressure shock. The dimensions of the riser is carried out according to DIN 14462 DN 80. Other dimensions can then be selected when the computation required by DIN pressures and water volumes are achieved.

Riser dry-wet

This version is used for initial fire fighting by the laity by means of wall hydrant cabinets. Here, the extinguishing water is flooded only via an electric contact which is triggered at a hydrant cabinet in the conduit. The extinguishing water needed is available by that date at a filling and emptying station, which is open through a membrane. The filling must be done within 60 seconds, according to DIN 14462, which can make installation in large construction projects very difficult. This type of riser is always used where risk of frost and therefore a constantly submersed cable is not possible. Dimensioning is not fixed and has to be calculated individually to ensure water volumes and pressures.

For a line to S standard ( self-help ) it is required that at least 48 liters per minute are delivered. For a line to F standard ( for the fire ), however, 380 liters per minute are required.

Riser wet

This version is also used for fire fighting by the laity by means of wall hydrant cabinets. The difference here, however, that the cable is permanently filled with water. In Germany, the separation between potable and fire fighting water in accordance with DIN 1988-6 means of an open template container is because stagnant water in the long run back germs and when the pressure drops, the water with germs and then may become contaminated the drinking water line. To achieve the necessary pressures on the wall hydrant cabinets, a fire pump must be installed additionally.