Fire suppression foam comprises three parts: foam concentrate, water, and air. When mixed correctly, these parts form a homogeneous foam blanket that extinguishes flames by the combined cooling mechanisms, separating the flame source from the product surface, suppressing vapors, and smothering. This makes foam suppression systems an effective option for protecting flammable and combustible liquids.

NAFFCO Pre-piped Vertical Bladder Tank is a complete self-contained proportioning system consisting of a bladder tank, ratio controller, and assembled piping. It is designed to inject foam concentrate into the water supply of a fire protection system and automatically proportions over a wide range of flow and pressures without the use of external power supply. NAFFCO Pre-piped Vertical Bladder Tank utilize water supply to pressurize the bladder and force the foam concentrate into the ratio controller. Once the system is in operation, water supply simultaneously feeds the bladder tank and ratio controller. The water applied to the outside surface of the bladder will subsequently displace the foam concentrate contained inside the bladder through the foam outlet pipe and into the metering orifice of the ratio controller. The water flowing through the ratio controller will create a low-pressure area between its inlet nozzle and to its downs stream section. The low-pressure causes the foam concentrate to flow proportionately to the water flow through the metering orifice. This ensures correct proportioning of the foam concentrate and water over a wide range of flow conditions.