During hurricane season, a contractor must secure a 150-foot tower crane. According to FEMA guidelines, at what sustained wind speed should the crane be secured in its weathervaning position?
Correct Answer
D) 39 mph
FEMA guidelines require tower cranes to be secured in weathervaning position when sustained winds reach 39 mph (tropical storm force). This prevents structural damage and ensures public safety during severe weather events.
Why This Is the Correct Answer
FEMA guidelines specifically mandate that tower cranes must be secured in weathervaning position when sustained winds reach 39 mph, which corresponds to tropical storm force winds. This threshold is established because winds at this speed can create dangerous conditions for crane operations and pose significant risks to both the equipment and surrounding areas. The weathervaning position allows the crane to rotate freely with the wind direction, reducing structural stress and preventing potential collapse or damage.
Why the Other Options Are Wrong
Option B: 55 mph
45 mph exceeds the required threshold and would leave insufficient time to properly secure the crane before dangerous conditions develop
Option C: 35 mph
35 mph is below the FEMA-mandated threshold and would not provide adequate safety margin before tropical storm conditions develop
Memory Technique
Remember '39 = Tropical Storm Time' - when winds hit 39 mph, it's time to secure cranes as tropical storm conditions begin
Reference Hint
FEMA P-361 Safe Rooms for Tornadoes and Hurricanes, Chapter 4 - Wind Load Requirements, or Florida Building Code Chapter 16 - Structural Design
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