POK English catalogue (Complete)

POK France - ZI Les Guignons - 10400 Nogent-sur-Seine - FRANCE Tel: +33 (0)3 25 39 84 78 - Fax: +33 (0)3 25 39 84 90 - Email: export@pok.fr - Web: www.pok.fr 431 Fire nozzles reaction force The value of the reaction force of a firefighting nozzle is determined by the formula : Reaction Force of a Firefighting nozzle In which : Qm = Mass Flow (Kg/s) Qv = Volumetric Flow (m²/s) = Volumetric Mass (kg/m 3 ) : example water = 1000 kg/m 3 v = Velocity of the water at the nozzle tip (m/s) (Torricelli’s Formula) In which : S = Area of the nozzle tip (m²) g = Acceleration of the weight (9,81 m/s²) H = Manometric Height in meters (m) Therefore : Reaction of the Nozzle (Formula) F = Force of Reaction (daN) d = Diameter of the nozzle tip (mm) P = Pressure of the nozzle (bar) Ø d v F Pressure (bar) Reaction Force (daN) 1 2 3 4 5 6 7 8 9 10 12 14 16 1 2 3 4 5 10 20 30 40 50 100 200 300 400 500 1 000 Diameter of Nozzle Tip (mm) 12 8 14 18 24 30 35 40 50 56 Reaction Force for Firefighting Nozzles, by pressure and tip diameter