2-16
PAY ATTENTION TO WEATHER INFORMATION
• In case of thunderstorm, risk of lightning exists, so abort working with crane, immediately lower the
load and contain the boom.
• Exposing the hoisted load to wind causes the load to waggle and causes the Machine to be unstable,
thus is dangerous. Immediately lower the load and contain the boom when the wind is causing the load
to waggle.
• If the maximum instantaneous wind speed is 10 m/s or greater, abort working with crane, immediately
lower the load and contain the boom.
• Even when tｈe maximum instantaneous wind speed is below 10 m/s, bigger the hoisted load, higher
the hoisted load position, and longer the boom, the wind effect increases accordingly. Be fully careful
during work.
• When a load such as a steel plate that has a large area exposed to wind is being hoisted, the wind
arriving from front/rear/side of the boom may cause the Machine to trip or damage the boom. Be fully
careful when working.
• When an earthquake occurs, abort working and wait until the earthquake is over.
The following table indicates approximate relation between the wind speed and wind effect. The wind
speed mentioned in the weathercast is mean wind velocity (m/s) during 10 m at 10 m above the
ground.
Force Wind Speed (m/s) Effect On Land
0 Less than 0.3 Smoke rises vertically.
1 0.3 - below 1.6 Wind motion visible in smoke.
2 1.6 - below 3.4 Wind felt on exposed skin.
3 3.4 - below 5.5 Leaves and smaller twigs in constant motion.
4 5.5 - below 8.0 Dust and loose paper raised. Small branches begin to move.
5 8.0 - below 10.8 Smaller trees sway. Some foam and spray.
6 10.8 - below 13.9
Large branches in motion. Whistling heard in overhead wires.
Umbrella use becomes difficult.
7 13.9 - below 17.2 Whole trees in motion. Effort needed to walk against the wind.
8 17.2 - below 20.8 Twigs broken from trees. Progress impeded.
9 20.8 - below 24.5 Light structure damage. Slates blown off.
10 24.5 - below 28.5 Trees uprooted. Considerable structural damage.
11 28.5 - below 32.7 Widespread structural damage.
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