4/20/2021 0 Comments Fire Sprinkler Design Basics
This is an unusual use of the word density since we know, of course, that the density of water is 1.The density of application, however, means how much water we apply over a certain area, much the same as pressure is a force applied over a unit area.
As a Litre of water is defined as cubic decimetre which is 10 centimetres 10 centimetres 10 centimetres, (1 L 1 dm 3 1000 cm 3 ). Hence 1 L 0.001 m 3 1000 cm 3 and 1 m 3 (i.e. S.I. unit for volume) is exactly 1000 L. The sprinkler head distributes the water in an even pattern so that in the case of OH3, each of the 12m 2 covered by the head receives its share of water. ![]() Since there are (100 x 100 x 100) ie. If each of the 18 sprinkler heads is discharging 5dm 3 m 2 every minute then we will require a flow of (5 x 18 x 12)dm 3 min 1080dm 3 min. In calculating pipe sizes this is approximated to 1000dm 3 min. If we know the area a sprinkler head is covering and the required design density then we can use the following formula. The specific design density to be used for design purposes is determined by reference to the occupancy fire hazard of the building once this is known the applicable design standard such as EN 12845, BS 9251 or NFPA 13 will have tables of occupancies from which you can find the required design density. We can now calculate the minimum flow rate from the fire sprinkler to provide the required design density, this can be found from the equation. A decimeter (dm 3 ) is 1,000 cubic centimetre (cm 3 ) or 11000 of a cubic metre.
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