For PHP-type units, should the water discharged by the turbine-driven system be mixed with foam solution?
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When a PHP-type balanced proportional mixing unit uses a turbine to drive a gear pump, should the water discharged by the turbine be mixed with the foam liquid?
The water output from the turbine and the water used to drive the turbine should be added to the amount of water required for firefighting. The water output from the turbine must be returned to the fire tank. The water used in the turbine’s circulation system cannot be included in the total amount of water required for firefighting. As an example: the water needed for foam firefighting is 35 L/S, and the water needed to drive the turbine is 5 L/S. The height at which foam firefighting is carried out is 60 meters. To select a suitable fire-fighting unit, one should choose one with a water supply capacity of 40 L/S and a pressure loss of 60 + PHP. The total amount of water required for one-time foam firefighting is 126 liters; the volume of the turbine’s circulation pipeline is 1 liter. Therefore, a tank with a capacity of 127 liters is necessary