crane & rigging safety

8/10/2019 Crane & Rigging Safety

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Al Ehsaa Housing Project

1

Health Safety Environment


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2Health Safety Environment

TITLE


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Elements of a Lifting Plan

The lifting plan shall include but not be limited to the following considerations:

The personnel required

The personnels roles, responsibilities and competencies

Compliance to statutory requirements and manufacturer's operation

manual for the lifting equipment

Permit-to-Worksystem which is mandatory for all lifting operations.

Nature and weight and dimension of loadincluding the NET and

GROSS weights.

Type and location of lifting/ rigging points.

Selection of appropriate liftingequipment, liftinggear and appliances.

Application of the correct liftingmethods

Position of liftingequipment, personnel and of the load, before and after the lift

operation.


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Elements of a Lifting Plan

The work site operation including proximity of other lifting equipment and work

activities.

Requirements to erect / dismantle the lifting equipment.

Assessment of the need for tagline to control movement of the suspended load.

Means of communication during lifting operations.

Environmental factors detrimental to the lifting operations such as ground

conditions, adverse weather, wind, and poor illumination.

Ensuring a system for reporting any defects is in place.

Provision of a safe place of work for all personnel during lifting operations.

Separate the lifting area with proper barricades and signboard to avoid

unauthorized entry.


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Key Factors of a Lifting Plan

Key Factors of aLifting Plan

Details of

Load

Details of

Lifting Equipment

Means of

Communication

Personnel Involved

Physical &

Environmental Factors



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Weight of Load

h

l

Volume

= l x b x h

Rr

L

Volume =

3.14 X L X ( R2 - r2)

Weight

=Volume X density

Weight

=Mass X Gravity (9.8m/s2)


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Center of Gravity

The point at which the entire weight of a body

may be considered as concentratedso that if

supported at this point the body would remain in

equilibriumin any position

Center of Gravity

12 M GRP


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Center of Gravity

Center of Gravity

10 Ton

Ton5Ton 78 543265 5643 782


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Selection of Cranes

Weights and dimensions of loads

Height of lift and distance / areas of movement of loads

Number and frequency of lifts

Period of time for the lifting operation

Ground Conditions

Other Factors


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Working Zone

*31m

* Reading are notexact value


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Major Hazards

Collision with Obstacles

Overturning of the Crane

Breaking the Boom

Falling Objects

Touching the Overhead

Power line

Minimum Clearance Distance Table

Voltage Minimum ClearanceDistance in Feet

Upto 50 (kV) 10

Over 50 to 200 15

Over 200 to 345 20

Over 345 to 500 25

Over 500 to 750 35

Over 750 to 1,000 45

Safe Distance from Power line


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Lifting Equipments


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Web Sling - WLL

WLL- Working Load Limit


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Communication - Hand Signals


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Rigging Team

Lifting

Supervisor

Rigger

Signal

PersonFlag Man

Trained

Workers

CraneOperator

Lifting

Coordinator


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Environmental Factors

Wind

Weather

Visibility

Object Temperature

Chemical Conditions and Exposure

Stability of the Ground

Underground Utilities


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Safe Lifting

Safe Lifting MethodsTurnbuckles


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Rigging Factors


Load Weight

Weight

Distribution

Adequate

Sling Length

Center of

Gravity

Rigging Factors

Positive Load

Engagement

Load

Control


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Equipment & Lift Criteria

Single or Multiple Crane

Maximum Planned Operating Radius

Allowable Load ( From Load Chart )

Ratio of Lift to Allowable Load

Clearance between Boom & Lift

Clearance to Surrounding Facilities

Power Lines & Environmental hazards

Ensure a Clear Load Path

Emergency Set Down Area

Thorough Equipment Inspection


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Rigging Considerations

Sling Selection : Type & Capacity

Load Control

Lift point over the center of gravity

Appropriate Hitch for CG and Load Control

Coordination of Multiple Sling

Positive Sling to Load Engagement

Friction : Sling to load

Load is free to move & is not snagged

Sling capacity is Adequate ( Angle and Tension )

Adequate Sling protection.CG- Center of Gravity


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Safe Working Load ( SWL )

Stated as the Normal Working Load (NWL) is the load that a piece of lifting

equipment, lifting device or accessory can safely utilize to lift, suspend, or lower a

mass without fear of breaking. Usually marked on the equipment by the

manufacturer and is often 1/5 ( 5 : 1) of the Minimum Breaking Strength (MBS)

although other fractions may be used such as 1/4, 1/6 and 1/10

Load represents a force that is much less than that required to make the lifting

equipment fail or yield, also known as the Minimum Breaking Load (MBL).

SWL or WLL = MBL( Minimum Breaking Load )

SF(Safety Factor) .

lbf = Pound-Force

kN= Kilo Netwon


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Sling Angle Factor

The Sling Angle Factor is a multiplier used to

determine the required sling size when angleformed between sling and load is less than 90o

Avoid rigging loads where angle is less than 45

o

90o 60o 45o

b

ca

Angle

=Sin-1 (a/c)

Click to

Calculate

Angle


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5

10

15

20

25

30

35

40

45

50

5560

6570758085908580

7570

6560

55

50

45

40

35

30

25

20

15

10

5

Sling Angle Tension Factor Remarks

90o 1.000

GOOD

85o 1.004

80o 1.015

75o 1.035

70o 1.064

65o 1.104

60o 1.155

55o 1.221

CAUTION

50o 1.305

45o 1.414

40o 1.55

WARNIN

G35o 1.742

30o 2.000

25o 2.364

DANGER20o 2.924

15o 3.861

10o 5.750

5o 11.49

CenterofGravity

Sling Angle Tension Factor


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25

30

3540

45

50

5560

6570

7580859085807570

6560

55

50

45

40

35

30

25

Sling Angle Loss Factor Remarks

90o 1.000

GOOD

85o 0.9962

80o 0.9848

75o 0.9659

70o 0.9397

65o 0.9063

60

o

0.866055o 0.8192

CAUTION

50o 0.7660

45o 0.7071

40o 0.6428

WA

RNING

35o 0.5736

30o 0.5000

25o 0.4226

DANGER

CenterofGravity

Sling Angle Reduction Factor


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Load of Capacity -%

100%99.6%98.5%

96.6%

94.0%

90.6%

86.6%

81.9%

76.6%

70.7%

64.3%

57.4%

50.0%50.0%

57.4%

64.3%

70.7%

76.7%

81.9%

86.6%

90.6%

94.0%

96.6%98.5%

99.6%

30

35

40

45

50

55

60

65

7075

8085908580

7570

65

60

55

50

45

40

35

30

Angle

Capacity

CenterofGravity


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Weight on Slings

P/2=25tons

P/2=25tons

P=50 tons

60o 60o

Weight in Each Sling

= 50 tons / 2

=

25 tons

Force in Sling

= 25 tons / sin 60o =28.87 tons


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Sling Tension

1lbs= 0.454Kg

( H )

15 ft

3 ft 9 ft

12 ft


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Tension on Each Sling


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Testing & Inspection

All testingand examinationof cranes,

lifting equipments must be carried out

by competentexaminers and the

regular inspectionscompleted by

competent personnel. All testing,

examination and inspection reports and

certificates shall be properly recorded.


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Inspection

Right way: Saddle on live end

live line

dead end

Wrong way: clips reversed

Wrong way: clips staggered


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Anchoring


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Anchoring


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Lift Calculation


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Any Question


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38H lth S f t E i t

YOUR SAFETYOUR PASSION

THANK YOU

crane & rigging safety

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