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QAY220 All Terrain Crane Operation Manual
1-9-4 Wind pressure-height conversion factor K
Influence of the wind on the crane: the higher the boom above the ground, the larger the wind
pressure as well as the wind velocity. When calculating the wind pressure for crane operation, if the boom
length is less than 50 m, 125N/m
2
more than 50 m, 150N/m
is taken. Refer to Table 1-4 for wind pressure-height conversion factor K
Height above
10～
20～
≤10
ground h/m
20
K
h
1.00
1.13
1.32
on land
Wind velocity
14.1
15.03
16.25
Vs
m/s
Notes:
1: Relationship between crane wind pressure and wind velocity: P=0.625 v
for calculation, in N/m
; v
is the average instaneous wind velocity, in m/s.
2
s
2: K
is wind pressure-height conversion factor.
h
2
is taken as the wind pressure for calculation; if the boom length is or
Table 1-4
30～
40～
50～
60～
30
40
50
60
70
1.46
1.57
1.67
1.75
17.09
17.72
20.02
20.49
h
70～
80～
90～
100～
110～
80
90
100
110
120
1.83
1.90
1.96
2.02
2.08
20.96
21.35
21.69
22.02
22.34
2
, in which is the wind pressure
s
General safe operating practices
Chapter 1
.
h
120～
130～
140～
130
140
150
2.13
2.18
2.23
22.61
22.87
23.13
1-11
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