Picture 1 - Foam water system typical layout Types of foam water spray systemsįoam water systems are generally divided into the following four (4) categories: The foam solution produced by water and foam concentrate flows into the system piping and is discharged through the open nozzles or sprinklersįoam water spray systems can be used for discharge of water first, followed by discharge of foam for a pre-determined period, and then followed by water until manual shut off. At the same time, piping to the bladder tank flows and pressurizes the outer shell of the bladder tank which forces foam concentrate to travel into the system piping and then into the Foam Proportioner. These systems are equipped with a bladder tank containing foam. When a fire is detected a signal is sent to the releasing panel to open the deluge valve allowing water to flow. Method of operation for foam water spray systemsįoam water systems generally work by allowing foam concentrate to mix with water flowing into the piping system. They are mostly applicable to the protection of two-dimensional flammable liquid hazards. Foam water spray systems can be used for a combination of Class A and Class B hazards.
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