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## Chapter 18 High-rise Office Buildings That can put out an effective fire stream (290 gpm) at as low as 40 psi nozzle pressure (the 14-in. solid tip). But what about those fires that won't go out even when you hit it with 300 gpm? The large open floor office is a prime candidate for this proble...

## Chapter 18 High-rise Office Buildings That can put out an effective fire stream (290 gpm) at as low as 40 psi nozzle pressure (the 14-in. solid tip). But what about those fires that won't go out even when you hit it with 300 gpm? The large open floor office is a prime candidate for this problem, where the volume of fire can easily outstrip even the 14-in. solid tip. The answer to a large-volume fire is no different on the 31st floor than it is on the third floor - large volume hose streams! The problem with the 31st floor fire is that we don't have 31-story tower ladders. (Yes, there are a few 22-story platforms, but they are not the answer to the problem because buildings can always go higher. What do you do for a 60-story building?) The solution that has been tried in the past is the lightweight master stream device (fig. 18-31). Many of these devices are light enough to be carried by one person, even when it is necessary to carry it up 30 flights because the elevators are out.