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A discharge test (foam solution test) is conducted on foam fire protection systems to ensure the foam proportioning system is performing correctly. NFPA recommends that discharge tests be conducted on systems when they are installed and annually thereafter. NFPA recommends a foam proportioning system operates at minus 0% to plus 30% of the normal foam proportioning rate or 1 percentage point, whichever is less: For example.
Dyne Technologies can determine the concentration of an unknown foam solution. Simply send the unknown solution along with a sample of the foam concentrate from the system and a sample of the system water. We will mix a minimum of three standard solutions in our laboratory using the foam concentrate and the system water. We then measure the refractive index or conductivity of the standard solutions. Using the graph, we estimate the concentration of the unknown foam solution.
The following is an example of a graph of the conductivity of three standard solutions mixed in our laboratory.
