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NATIONAL CRANE
Published 11-01-2020 Control # 710-00
2-7
NBT60XL OPERATOR MANUAL
SAFETY PRECAUTIONS
2
NOTE:
The wind speed corresponding to the Beaufort
scale in the table is mean wind speed at 10 m
(33 ft) elevation over a period of 10 minutes.
Table 2-1 Beaufort Wind Scale
Wind Speeds
The maximum permissible wind speed referred to in the load
charts is the 3-second wind gust speed measured at the
boom tip height and is designated as
V(z)
. This value is
either recorded at boom tip or calculated based on mean
wind speed recorded at equipment operation site. For lift
planning purposes only, the 3-second wind gust speed,
V(z)
,
may be calculated based on mean wind speed reported at
http://www.windfinder.com “Super Forecast”.
This 3-second wind gust is assumed to act on the entire
equipment and the load. The wind effect on the load can be
conservatively estimated as:
a) If
V(z)
is ≤ 13.4 m/s (30 mph), then the
allowable
load is the published rated capacity from the Load Chart.
b) If
V(z)
is > 13.4 m/s (30 mph) and is ≤ 20.1 m/s
(45 mph), the
allowable
load is the published rated
capacity multiplied by the Capacity Reduction Factor
from Table 2-4 (metric) or (non-metric).
NOTE:
This condition is limited to operation with the main
boom on fully extended outriggers only.
c) If
V(z)
is > 20.1 m/s (45 mph), then lifting is NOT
permitted. Cease lifting operations and lower and retract
the boom.
In both cases
a
) and
b
) above, the lift may also be limited by
the projected wind area of the load
Ap
and by the wind drag
coefficient
Cd
: This limit can be determined by comparing
the
Actual
wind resistance area with the
Allowable
wind
resistance area.
Refer to Figure 2-1 for a simplified calculation method to
determine permissible wind speed.
Maximum Wind Speed
Beaufort
Number
Description
m/s
km/h
mph
Visible Indicator
Effects of wind as observed on land
Zero (0)
Calm
0.3
1.1
0.7
Calm; smoke rises vertically
1
Light Air
1.5
5.4
3.4
Smoke drift indicates wind direction. Leaves and wind vanes
are stationary.
2
Light Breeze
3.3
11.9
7.4
Wind felt on exposed skin. Leaves rustle. Wind vanes begin to
move.
3
Gentle
Breeze
5.4
19.4
12.1
Leaves and small twigs constantly moving. Light flags
extended.
4
Moderate
Breeze
7.9
28.4
17.7
Dust and loose paper raised. Small branches begin to move.
5
Fresh
Breeze
10.7
38.5
23.9
Branches of a moderate size move. Small trees in leaf begin to
sway.
6
Strong
Breeze
13.8
49.7
30.9
Large branches in motion. Whistling heard in overhead wires.
Umbrella use becomes difficult. Empty plastic bins tip over.
7
High Wind
17.1
61.6
38.3
Whole trees in motion. Effort needed to walk against the wind.
8
Gale
20.7
74.5
46.3
Some twigs broken from trees. Cars veer on road. Progress on
foot is seriously impeded.
9
Strong Gale
24.4
87.8
54.6
Some branches break off trees, and some small trees blow
over. Construction/temporary signs and barricades blow over.
10
Storm
28.4
102.2
63.5
Trees are broken off or uprooted, structural damage likely.
Fo
r
Reference
Only
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