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Warning notices – Snorkel AB48HSRT-sn4611+ User Manual

Page 12

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10

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.

BEAUFORT WIND SPEED SCALE


The Beaufort Scale of wind force is accepted internationally 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%

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 walk-
ing 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 removed)

22-24

DESCRIPTION OF WIND

WARNING NOTICES

SECTION

E