The principle of our ultra-high pressure (UHP) systems is remarkably straightforward. Simplistically, very energetic but small water droplets give you more surface area to combat fire. This is how UHP works:
HMA Fire, in conjunction with the Air Force Research Lab at Tyndall Air Force Base in Panama City, Florida, tested various flows at low pressure and ultra-high pressure (see chart to the right) in a 3,500-square-foot pit containing 380 gallons of JP-8 fuel. The results?
The conclusion? UHP, at 20 gpm is the optimal flow, blowing all low-pressure systems out of the water.
Smaller water droplets, greater surface area and rapid steam conversion help UHP extinguish fire and reduce room temperatures in significantly less time.
If a fire is expending energy on something other than burning, it will go out quicker. The chart to the right shows that it take 1 calorie of energy to raise the temperature of water by 1 degree Celsius. It takes 540 calories to change 100 degree Celsius water to steam. Steam conversion burns 539 more calories than non-steam conversion. The microdroplets found in a UHP stream convert to steam quicker and more efficiently than low pressure large droplets.