Patent ID: 8511395

Claim:
A stationary fire fighting system for use in a structure, the system being coupled to a water supply and a main water pump that generates a water stream, the system comprising: at least one water flow meter to measure the water stream and generate a water flow signal; a primary foam proportioning system including a first foam pump, a first motor, a first foam flow meter, and a first controller, the first controller configured to automatically operate the first foam pump based on the water flow signal in order to inject liquid foam concentrate directly into the water stream; a redundant secondary foam proportioning system including a second foam pump, a second motor, a second foam flow meter, and a second controller, the redundant secondary foam proportioning system being automatically started in case of component failure in the primary foam proportioning system, the second controller configured to automatically operate the second foam pump based on the water flow signal in order to inject liquid foam concentrate directly into the water stream; and wherein the at least one water flow meter includes a first water flow meter and a second water flow meter in fluid communication with the water supply, the first water flow meter being in fluid communication with the primary foam proportioning system, and the second water flow meter being in fluid communication with the redundant secondary foam proportioning system.