Effects of ammonium sulfate and Effects of ammonium sulfate and ammonium phosphate on flammability effectsofammoniu121geor Year: 1972 Air sRetardant Solution^ Figure 1.—Application equipment. determining the volume rate through the nozzle at a given pressure while measuring the lateral spray pattern. A nozzle diameter, height, and tank pressure were selected that would provide a uniform lateral pattern over the fuel bed width. The fuel beds were then pushed under the nozzle at a constant predetermined speed to apply the desired amount of solution. The application equipment and spray system
Effects of ammonium sulfate and Effects of ammonium sulfate and ammonium phosphate on flammability effectsofammoniu121geor Year: 1972 Air sRetardant Solution^ Figure 1.—Application equipment. determining the volume rate through the nozzle at a given pressure while measuring the lateral spray pattern. A nozzle diameter, height, and tank pressure were selected that would provide a uniform lateral pattern over the fuel bed width. The fuel beds were then pushed under the nozzle at a constant predetermined speed to apply the desired amount of solution. The application equipment and spray system in operation are shown in figures 1 and 2. The fuel beds were weighed prior to and following application of the retardant solution. The amount of solution per square foot of fuel bed and the percent of solu- tion as a function of dry fuel weight were calculated. Conditioning of Fuel and Environmental Conditions Following application of the retardant solution, the fuel beds were allowed to reach an equilibrium moisture content in the combustion chamber under controlled environmental conditions. The combustion chamber air temperature was held at 90° ±2° F. and the relative humidity at 20 ±2 percent. A new equilibrium moisture content of between and percent was reached. Equilibrium was determined by periodic weight checks of the fuel bed, and the moisture content was determined by using the xylene distillation method. All burning tests were made in a large wind tunnel at an air velocity of 5 Fuel bed conditioning and the burning tests were conducted under similar temperature and relative humidity conditions. These conditions are equivalent to a Fine Fuel Spread Index of 36 (USDA Forest Service 1964). 5
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