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Pad Eye Design

Seminar on 06-04-2013; pad eye design, padeye design template, padeye calculation
by

Faheem K K

on 21 June 2015

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Transcript of Pad Eye Design

Sreelakshmi Pradeep
Faheem K K

Pad Eye Design
Shackles
Lifting Legs (Slings)
Chain Slings
Wire Rope Slings
Pad eyes
Anchor Shackles
Chain Shackles (D)
Lifting
Set
Miscellaneous
Dimension Fixing
Pad eye check
Shackle
& Sling
Load factors
& Safe Working Load
Design Procedure
What are the inputs ???
Rating or
Total weight to be lifted
But that is not the only load acting during lifting !!!
LOAD FACTORS !!
Dynamic Amplification Factor
Tilt effect
Skew load factor
Contingency factor
Additional FoS
Resultant Sling Load (RSL) =
Number of Pad eyes X Cos (Theta)
Rating x Load Factors
Important !!
Sling Angle (theta)
2.
Shackle
Working load limit
Select a standard shackle
Sling
Ultimate breaking strength
Select a standard sling
We have the RSL !!
Other Classification
Pin Diameter
Inside Width
Inside Length
Values to be considered
Inside width of the shackle > Thickness of pad eye = Tm + Tch > 0.75 x Inside width
Inside length of the shackle > Top Plate Clearance = Rm - Hd/2 > 0.75 x Inside length
Pin Dia < Hole Dia < 1.06 x Pin Dia
Allowable Stresses
1. Allowable shear stress : 0.4 Fy
2. Allowable bearing stress : 0.9 Fy
3. Allowable bending stress : 0.6 Fy
4. Allowable tension / compression stress : 0.6 Fy
5. Allowable shear in fillet weld : 0.3 Ft
6. Von Mises Stress: 0.9 Fy
Important Dimensions
Main plate thickness
Main plate radius
Cheek plate radius
Cheek plate thickness
Hole diameter
Checks
1. Strength Check
at the pad eye hole
2. Strength Check
at the pad eye base
3. Weld Check
Shear Check
Bearing Check
Tension Check
Hertzian Contact Stress Check
Shear check in Y-dir
Shear check in Z-dir
Tensile check
Bending check (Bending about Y-dir)
Bending check (Bending about Z-dir)
Von Mises Stress
Weld between main plate and 1st cheek plate
Weld between 1st cheek plate and 2nd cheek plate
Weld between main plate and deck plate
Strength Check
at the Pad eye Hole
1. Shear Check
Shear Stress

= F/(2 x A)
2. Bearing Check
Bearing Stress

= F/A
3. Tensile Check
Tensile Stress

= F/A
4. Contact Check
Contact Stress

=
Strength Check
at the Pad eye base
2. Shear Check Z-Z direction
Shear Stress

= F/A
6. Von Mises Stress
5. Tensile Check
Tensile Stress

= F/A
3. Bending Check - Z-Z Direction
Bending Stress

= BM/SMz
1. Shear Check Y-Y direction
Shear Stress

= F/A
4. Bending Check - Y-Y Direction
Bending Stress

= BM/SMy
σ11=Bending stress-Y + Bending stress-Z + Tensile stress
σ22=0
σ33=0
σ12=0
σ23=Resultant of Shear Stress in Y-dir and Z-dir

σv = sqrt( σ11^2 + 3 x σ23^2 )
Weld Check
Weld between main plate and deck plate
Weld between 1st cheek plate and 2nd cheek plate
Weld Stress

=
Weld between main plate and 1st cheek plate
Weld Stress

=
F
(pi x R1 x a)
x
t1 + t2
T
F
(pi x R2 x a)
x
t2
T
Tx=Bending -Y + Bending -Z + Tensile stress
Ty=Shear Stress in Y-dir
Tz=Shear Stress in Z-dir

T = sqrt( Tx^2 + Ty^2 + Tz^2 )
Thank You !
Deck plate thickness
Bracket size
Stiffener size underneath
Stiffener spacing
Stiffener span
Weld size
p - Load per unit length along line of contact between pad eye and shackle pin
Full transcript