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SAFETY PRECAUTIONS
OPERATOR MANUAL 600E2
2-14
PUBLISHED 04-26-2019 CONTROL # 113-09
•
Is the load to be lifted less than allowable load?
8,000 kg
≤
12,040 kg
YES
•
Is
Awr
(load)
less than
Awr
(allow)
?
19.83
m
2
≤
14.45
m
2
NO
Conclusion
: This load is NOT permissible to lift in wind
speed up to 20.1 m/s, but permitted to lift at a reduced wind
speed calculated as follows:
Ratio
=
1.37
From Table 2-5, the maximum permissible wind speed at
ratio of 1.37 (rounded to next higher table value of 1.4) is
17.0 m/s.
Conclusion
: This load is permissible to lift in wind speed up
to 17.0 m/s only.
Table 2-6 Example-Capacity Reduction Factors for Wind Speed
V(z)
Greater than 30 mph - Non-metric
(Only for lifting with main boom on fully extended outriggers, with or without stowed extension)
For wind speed
Vz
(3-second gust speed at boom tip height) is greater > 30> mph
≤
45 mph, the Reduced Capacity
shall be calculated by multiplying the Published Rated Capacity by the following factors:
Main Boom Length in Feet
Wind Speed
Vz
> 30 mph
<
45 mph
36
40
50
60
70
80
90
100
110
Factor
0.9
0.9
0.8
0.8
0.8
0.8
0.8
0.7
0.5
Wind resistance area of load,
Awr
(load)
, shall not exceed maximum allowable wind resistance area
Awr
(allow)
.
Maximum allowable wind resistance area in [ft
2
],
Awr
(allow)
= 0.0059 x calculated reduced capacity in lb.
Wind resistance area of load,
Awr
(load)
= projected wind area
Ap
x wind drag coefficient
Cd
for the load.
For wind resistance area of load,
Awr
(load)
> maximum allowable wind resistance,
Awr
(allow)
,
refer to equipment
Operator Manual.
Fo
r
Reference
Only
Summary of Contents for National Crane 600E-2
Page 1: ...Operator Manual National Crane 600E 2 F o r R e f e r e n c e O n l y ...
Page 2: ...F o r R e f e r e n c e O n l y ...
Page 10: ...TOC 6 TABLE OF CONTENTS OPERATOR MANUAL 600E2 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Page 121: ...F o r R e f e r e n c e O n l y ...
Page 122: ...F o r R e f e r e n c e O n l y ...