Likewise, what is the flow rate of a sprinkler head?Īt different pressures, the sprinkler head and nozzle will consume different amounts of water. Generally, a fire hose will flow an average of 100 gallons per minute. NOTE 2 this occupancy classification is not suitable for secure accommodation, asylum centers and large, open, communal dormitories or equivalent hazards.Most residential sprinkler heads are designed to flow between 10 and 13 gallons per minute. This matter is receiving the attention of the relevant BSI committee with a view to issuing an amendment. NOTE 1 where multiple occupation buildings exceed 20 m in height, special circumstances need to be considered and the authority having jurisdiction should be consulted. This pressure is a constant running pressure at the sprinkler control valve the desired flow rate i.e 164 L per minute for a period of 30 minutes. So for a three storey building you could expect 0.5bars (sprinkler) + 0.3 x 3 =0.9 bars (height) circa 1.0 bar (frictional loss created by the pipe system itself-varies with pipe size and system complexity) = 2.4 bars, similar to the pressure in your car tyres. Pipe work friction then adds losses, which must be compensated for. The building height also adds to the pressure required, each storey being circa 3 metres adds 0.3 bars. Occupancy for multiple occupation not exceeding 20 m in height, with a maximum individual room size of 180 m2, such as apartments, residential homes, houses of multiple occupancy (HMOs), blocks of flats, boarding houses, aged persons homes, nursing homes, residential rehabilitation accommodation and dormitories Maximum area coverage per sprinkler head: This pressure is a constant running pressure at the sprinkler control valve the desired flow rate i.e 84 L per minute for a period of 10 minutesġ x sprinkler head operating Liters per minute = 60 Liters per minute (Max room size 4.5m x 4m)Ģ x sprinkler heads operating Liters per minute = 84 Liters per minute (max room size 40m 2)
The building height also adds to the pressure required, each storey being circa 3 metres adds 0.3 bars.Pipe work friction then adds losses, which must be compensated for. Our designers will carry technical drawings and flow calculations the system will require at least 1/2 bar of pressure at each sprinkler head. Individual dwelling for occupation as a single family unit used or constructed or adapted to be used wholly or principally for human habitation, such as individual dwelling houses, individual flats, maisonettes This is of particular importance when the distance from the town’s main is unusually long. It is essential that the friction and static pressure losses in a connection pipe to a system should be hydraulically assessed at the maximum anticipated flow rate,including any domestic demand if appropriate, and taken into account within the design requirements of the system. The use of a priority demand valve may be used on such systems this is to ensure that in the event of operating the sprinkler system, the branch of the pipe work feeding the domestic demand will be automatically shut downĮxperience has shown that the required pressure/flows may not be met even when a town’s main supply is considered adequate and the commonly used pipe sizes selected for the connection of 32mm (domestic) and 63mm (residential) in MDPE pipe are used. These are systems where the mains pressure and flow delivery is adequate to feed the sprinkler operating requirements directly.
0 kommentar(er)
