POK English catalogue (USA)

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 311 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 Reaction Force (daN) 1 2 3 4 5 10 20 30 40 50 100 200 300 400 500 1 000 12 - 0.47 8 - 0.31 14 - 0.55 18 - 0.71 24 - 0.94 30 - 1.18 35 - 1.38 40 - 1.57 50 - 1.97 56 - 2.20 Pressure (bar - PSI) 1 2 3 4 5 6 7 8 9 10 12 14 16 14.5 29 43.5 58 72.5 87 101.5 116 130.5 145 174 203 232 Diameter of nozzle tip (mm - inch) Reaction Force for Firefighting Nozzles, by pressure and tip diameter