IMPORTANT NOTE ON GEL APPLICATION & WATER PRESSURE:
Gel applicators combine gel concentrate with water and deliver it to the nozzle at a precise mixture rate. The mixture rate is calibrated at a specific applicator inlet pressure for the specified applicator flow rate (GPM). Failure to provide the proper pressure for a specified nozzle flow rate will alter the mixture rate of fire gels.
Although gel applicators will begin mixing gel into the water stream with as little as 30 PSI, below the CALIBRATED INLET PRESSURE the gel will under hydrate, resulting in a drier gel with reduced thermal effectiveness and a faster dry-out time. On the other hand, pressures above the CALIBRATED INLET PRESSURE can result in over hydration which will reduce the products ability to cling to vertical surfaces, however this can usually be corrected by throttling back the engine to reduce the pump pressure to obtain the wettest gel mixture possible that will stick to a vertical surface.
It is the users responsibility to ensure that the water delivery system being used is capable of providing the proper CALIBRATED INLET PRESSURE for the specified eductor flow rate to allow the gel product to be applied properly for maximum effectiveness.
Remember, gel concentrate alone is NOT a fire retardant. It is the water held in suspension in the gel that creates the thermal barrier.