crane safety -is standards

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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