NFPA 16, clause 18.104.22.168 states The foam concentrate induction rate of a proportioner, expressed as a percentage of the foam solution flow (water plus foam concentrate), shall be within minus 0 percent to plus 30 percent of the Manufacturer’s listed concentration, or plus 1 percentage point, whichever is less.
We have a Premixed Foam System with 3% AFFF foam solution (No proportioner).
During the foam concentration test, it was tested with result 5% concentration in the foam solution. (meaning mix too much 3% AFFF concentration into the water).
Does this clause 22.214.171.124 applicable to Pre-mixed Foam System ?
What is the concept for the max allowable at 3.9% ?
Appreciate your opinion. Thanks