BC12 Flashcards
high rise buildings
more than 75ft
buildings above the reach of the fire departments equipment
can be 80-100ft or 50ft or more because of limitations of equiptment
became possible with steel frame and elevators
fire resistance of high rises
2-3 hours of structural frame depending on number of stories
2 hours for floor construction
standpipes
in 9-10 stories hose line can be advanced
hydrostatic pressure in lower floors
NFPA 14 requires pressure reducing valves
automatic sprinklers
supplied by same vertical riser as standpipes
elevators
only use if fire is above fifth floor
never take an elevator below ground level
phase 1 elevator operation
automatically stops all cars that serve fire floor if they are moving away from terminal floor
for all cars with vertical travel greater than 25 ft
does not apply to freight elevators
emergency stop and floor selection buttons are inoperable
triggered by:
activation of automatic smoke detectors
automatic sprinklers or water flow
manual key switch in terminal floor
phase 2 elevator operation
override recall feature so fire can use elevator
floor buttons in elevator work, buttons on floors do not
electric eye safety disbaled
underground occupancies
may be 30 feet or lower than entrance
greatest challenge is ventilation
smoke proof enclosures required for buildings with levels more than 30 ft below level of exit discharge
max fire protection is 4 hours
malls
1-3 stories
walkways must be 20ft wide
either type 2 or 5 construction
most are type 2a
stores must have 1 hour fire protection between them
atriums
enclosed with 1 hour fire rated construction or a combination of glass and sprinklers
usually provisions for 1 hour rating for enclosures up to three stories or more when certain conditions are met
areas of refuse
1 hour fire rating
rack storage
warehouses may have these with multiple rows of racks wider than 12ft aisles narrower than 3.5ft
12ft-100ft high
