OPERATING CONTROLS AND PROCEDURES 2250 OPERATOR MANUAL
3-82
Published 06-24-16, Control # 241-01
WIND CONDITIONS
General
See Figure 3-65 for more information.
Wind adversely affects lifting capacity and stability. The
result could be a loss of control over the load and crane,
even if the load is within the crane’s capacity.
The capacity of the crane is derated beginning at a wind
speed as low as 7 m/s (15 mph), depending on boom height.
For complete wind derate specifications, refer to the Wind
Conditions document, which is supplied at the end of this
section and in the Capacity Chart Manual.
Be aware that wind speed at the boom or jib point can be
greater than wind speed at ground level. Also be aware that
the larger the sail area of the load, the greater the wind’s
effect on the load.
As a general rule, ratings and operating speeds must be
reduced when wind causes the load to swing forward past
the allowable operating radius or sideways past either boom
hinge pin.
WARNING
Tipping Crane Hazard!
Avoid the possibility of death or serious injury. Failing to
observe this precaution can cause the crane to tip or the
boom and/or jib to collapse.
Qualified operators, job planners, and supervisors shall
evaluate the effect of wind on lifting and boom operations
and continually monitor the wind speeds and gusts. These
persons shall use their experience and judgment by
reducing the ratings or operating speeds, or a
combination of both.
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