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CRANE SAFETY
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SAFETY DEVICES IN CRANE
Angle Plate
Pointer
Boom Limit Switch
Over oi!t Limit !witch
oo" Latch
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LIFTIN# DATAS RE$D%
• Dim. of the equipment - Height /
length, dia• Wt. of the equipment - Erection
wt.
Wt. of the equip.+lifting tackles
+hook block + wire rope under the
boom tip + fl !ib and the hook
block attached to it.• "adius at which the equipment is
to be lifted.• #le$ation to which the equipment
should be lifted.
• Whether the crane is to bemo$ed with the load.• %ounter wt. required.•%entrifugal & wind force• 'pecific requirements if an.
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LIFTIN# DATAS RE$D%
Head room
Clearance between the boom & equip.
Soil Bearing Strength
Lifting tackles SWLEquip. base matches with
foundation
pproach for the crane
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Li&ting O'eration!!ossible causes for failure while lifting
(oor machine condition)achine configuration not to specification#ccentric ree$ing*mproper use of outriggers
'oft footing%rane not in le$el'ide loading*ncrease of load radius
"apid swing rate*mpact loading - rapid acceleration/decelerationDut ccle operationsHigh wind speeds
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"
#ippin
g $isSTABILITY OF CRANE
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(o)ile Crane!
Im'ortance o&
O*trigger!
Sta)ilit+ relation!hi' o& a)ove,
a-Loa. / L 0 Boom weight / B 1 Crane
weight / CTi''ing loa.1 234 /565 / 7%4- 8 9 1 :3%74
(T
a- Ti''ing loa. when o*trigger!
are to their &*ll e/ten!ion;eight o& crane 134(T% ;eight o& )oom
15(T%
B 1 Boom C# 6 7%4mt!%C 1 5mt!% 6 crane C# to ti''ing &*lcr*m
L 1 9mt!% .i!tance &rom loa. to ti''ing
&*lcr*m
)-Ti''ing loa. when o*trigger! are
<%4mt!% !hort o& their &*ll e/ten!ion
C 1 :%4 1 5%< 6 :%4=B 1 >%< 1 7%4 0 <%4
L 1 9%4 1 9%< 0 <%4
Ti'% loa. 1 234 / :%4 6 5 / >- 8 9%4 1 >%:
(T
9:? reduction of
tipping load
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%nsafe !ractices
on'%se of Hook Latch
"emedial (easures
%se Hook latch to a)oid
slings from getting
remo)ed from hook
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ABSENSE OF BOO( LI(IT S;ITC
Angle Plate
Pointer
Boom Limit Switch
Over oi!t
Limit
!witch
oo" Latch
No Boom Limit Switch
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Ra'i.
!winging
ca*!e! loa. to
.ri&t o*t 6
increa!ingra.i*! an.
loa. on the
crane
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Fail*re to !*''ort the
)oom8@i) .*ring erection or.i!mantling can ca*!e colla'!e
with inevita)le h*man in@*r+%
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;or"ing Near Overhea. Line!;or"ing Near Overhea. Line!
Minimum safe clearanceRated VoltagekV Ph To Ph rms
METRE FEET
>6.6 kV 2.5 !.5"
>6.6 #V $%&&#V 2.5' !.5">&& #V $%22 #V 2.6( !.5
>22 #V $%)) #V 2.5 '.""
>)) #V $%66 #V )."" '.5
>66 #V $%&)2 #V ).() &&.25>&)2 #V $%2(5 #V (.5 &5.""
>2(5 #V $%("" #V 5.(! &!.""
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;or"ing Near Overhea. Line!;or"ing Near Overhea. Line!
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A << mm wi.e
clearance m*!t )e
'rovi.e. whenever
'ractica)le )etween
travelling an. !lewingcrane! an. an+ &i/t*re
2e%g% a.@acent )*il.ing!
g*ar.rail! acce!! etc%-%
I& the clearance i! not'ractica)le then acce!!
!ho*l. )e )arre. o&&
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!rocedures to *ollow +f Contact!rocedures to *ollow +f Contact
,ccurs,ccurs #he crane operator should remain inside the cab.#he crane operator should remain inside the cab. ll other personnel should keep awa- from the cranell other personnel should keep awa- from the crane
ropes and load since the ground around the machineropes and load since the ground around the machinemight be energi/ed.might be energi/ed.
#he crane operator should tr- to remo)e the crane from#he crane operator should tr- to remo)e the crane fromcontact b- mo)ing it in the re)erse direction from thatcontact b- mo)ing it in the re)erse direction from thatwhich caused the contact.which caused the contact.
+f the crane cannot be mo)ed awa- from contact the+f the crane cannot be mo)ed awa- from contact the
operator should remain inside cab until the lines ha)eoperator should remain inside cab until the lines ha)e been de'energi/ed. been de'energi/ed.
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+f the crane operator must lea)e the+f the crane operator must lea)e the
equipment because of a more immediateequipment because of a more immediate
ha/ard then this person must 0ump clearha/ard then this person must 0ump clear
from the equipment and shuffle their feet infrom the equipment and shuffle their feet in
small steps.small steps. Secure the area and do not let an-oneSecure the area and do not let an-one
e$cept emergenc- rescue personnel go neare$cept emergenc- rescue personnel go nearthe energi/ed equipment.the energi/ed equipment.
roce ures o o ow on ac,ccurs,ccurs
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1
#he operator was asked b- the rigger
foreman to lower the cradle to enable
them to take tea as the person abo)e
wanted to come down during tea time.
#he Longitudinal Beam
2
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2
#he crane boom was hoisted be-ond safe
operating limit causing the boom to fra-
and collapse backwards along with the two
persons in the cradle and caused se)erein0uries.
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ABSENCE OF OVER OIST LI(IT S;ITC
No Limit Switch Limit Switch
SS O C O C A
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TYRE PRESSRE OF TRC (ONTED CRANE
3+nadequate #-repressure causes
crane unstable