Zoomlion RT100 - Page 41

05-2 RT75RoughTerrainCrane
Tomakeanestimateofthewindspeed,usethetablethatfollows:
Windforce Windspeed
Effectofthewindontheland
Beaufort
scale
Description
ft-in/s m/s
0 Calm 0-8″ 0-0.2 Nowind,smokerisesvertically
1 Lightair 1′-4″ -4′-7″ 0.4-1.4
Winddirectionshownbysmoke
driftbutnotbywindvanes
2
Light
breeze
5′-3″ -9′-10″ 1.6-3
Windfeltonface,leavesrustle,
vanesmovedbywind
3
Gentle
breeze
11′-2″ -17′-5″ 3.4-5.3
Leavesandsmalltwigsinconstant
motion,windextendslightflag
4
Moderate
breeze
18′-1″ -25′-7″ 5.5-7.8 Smallbranchesmove
5
Fresh
breeze
26′-3″ -34′-9″ 8-10.6 Smalltreesinleafbegintosway
6
Strong
wind
35′-5″ -45′-0″ 10.8-13.7
Largebranchesinmotion;difficult
touseumbrellas,whistlingheardin
telegraphwires
7 Neargale 45′-7″ -55′-9″ 13.9-17
Wholetreesinmotion,difficultto
walkagainstthewind
8 Gale 56′-5″ -67′-7″ 17.2-20.6
Breakstwigsofftrees,impedes
progress
9 Stronggale 68′-3″ -80′-5″ 20.8-24.5
Slightstructuraldamage(rooftiles
andchimneycovers,etc.blownoff)
10 Storm 81′-0″ -92′-10″ 24.7-28.3
Treesuprooted,considerable
damageoccurs
G. Donotoperatethecraneuntilitisinproperoperatingcondition.