Snorkel TL34-sn00001+ - Manual (Page 13)

BEAUFORT WIND SPEED SCALE
The Beaufort Scale of wind force is acceptedinternationally and is used in communicating
weather conditions. It consists of numbers 0 -12, each representing a certain strength of
velocity of wind at 10m (33ft.) above ground in the open.
Numbers 10-12are not shown in this table.
Approximate corrections for wind speeds at other heights are:
2m subtract 30%; 3m subtract 20%; 6m subtract 10%
15m add 10%; 30m add 25%
8. DO NOT operate the machine unless all four outriggers are down and in full
contact with the ground. The machine must be level and the wheels lifted
visibly clear of the surface before the booms are raised.
9. DO NOT move the machine with the
basket raised and never allow cage
or booms to slew into the path of
oncoming vehicles.
10. DO NOT operate the machine if the wind speed exceeds 12.5 m/s. Be aware
that, when working near high buildings or structures, shielding and
funnelling effects may cause high wind forces on days when the nominal
wind speed in the open is low. Wind speed can either be measured from
the work platform with a hand held anemometer or estimated using
the
Beaufort Scale.
SPECIFICATION FOR USE ON LAND M/Sec
0 CALM
Calm – smoke rises vertically
0-0.5
1 LIGHT AIR
Direction of wind shown by smoke drift but not by wind vanes.
0.6-1.5
2 LIGHT BREEZE
Wind felt on faces; leaves rustle; ordinary vanes moved by wind.
1.6-3.0
3 GENTLE BREEZE
Leaves and small twigs in constant motion; wind extends light
flag.
3.5-5
4 MODERATE BREEZE
Raises dust and loose paper; small branches are moved.
6-8
5 FRESH BREEZE
Small trees in leaf begin to sway; crested wavelets form on inland
waterways.
9-10
6 STRONG BREEZE
Large branches in motion; umbrellas used with difficulty.
11-13
7 NEAR GALE
Whole trees in motion; inconvenience felt when walking against
wind.
14-17
8 GALE
Breaks twigs off trees; generally impedes progress.
18-21
9 STRONG GALE
Slight structural damage occurs (chimney pots and slates re-
moved)
22-24
DESCRIPTION OF WIND
WARNING NOTICES
7