3-screw pump L23NG

for industrial waterhydraulic motorself-priming

L23NG - SOLVING CRITICAL FIREFIGHTING PROBLEMS Gerneral use: Leistritz proportioning systems are used to mix water with foam in different concentration (1%, 3% and 6%) and spray the mixture on the fire. Leistritz solution: The L23NG Leistritz solution uses a combination of two screw pumps. The water motor and the injection pump are both derived from the Leistritz screw pumps, respectively from the series L2NG and L3MF. The two pumps, together with the 3-way valve, the injection piping and the non-return valve, are assembled on a common base plate and are fully interconnected. Traditional solution: In the traditional solution – liquid displacement system – the water coming from the water line is used to pressurise the foam in the tank and to inject it in the water line.This solution has four major critical points: ↗ The system has to be calibrated ↗ It is sensitive to the changes of water pressure and foam viscosity ↗ It cannot be tested without consuming foam ↗ As the foam tank is pressurised, it cannot be easily refilled Advantages of Leistritz solution: The Leistritz L23NG can solve the critical points of the traditional solution, in particular: ↗ The system is intrinsically calibrated - the required percentage of the foam concentrate in the foam solution is obtained with a proper selection of the unit capacities of both hydraulic motor and injection pump ↗ It is insensitive to the changes of water pressure and foam viscosity ↗ As the foam tank is connected to the water line with a 3-way valve, setting it to recirculation is possible in order to test the system only with water (without consuming foam) ↗ The foam tank is atmospheric and therefore easily refillable