MOORING BRIDLE PLATE OR PADEYE DESIGN VERIFICATION  
 
http://www.calqlata.com/prodimages/PadEye%202-5.png
Three dimensional image of typical padeye
Padeye Check
       
  1) GEOMETRY        
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
  Figure : Padeye     Figure: shackle  
           
  Padeye        
  Length of Main Plate, L =
The length of the main plate should be longer than the diameter of the padeye to ensure the right geometrical shape of the padeye.
mm  
  Thickness of Main Plate,T = mm  
  Height to Pinhole, LA = mm  
  Diameter of Padeye hole, D = =
The hole diameter should be 3mm larger than the pin diameter to allow smooth entry.
mm  
  Radius of Padeye, R = mm  
  Diameter of Cheek Plate, dcheek = mm  
  Thickness of Cheek Plate, tcheek =
The thickness of the cheek plate should not be more than half the thickness of the main plate to ensure the right load transfer.
mm  
  Stiffener Length, Ls = mm  
  Stiffener Thickness, ts = mm  
  Shackle        
  Internal Length, C =
The Internal length of the shackle, measured from the outer diameter of the pin to the outer diameter of the shackle should be larger than the radius of the padeye.
22.4
mm  
  Internal Width, A =
The Internal width of the pin when fully locked should be between 2-6mm wider than the combined thickness of the main plate and 2 cheek plates.
9.7
mm  
  Eye Diameter, F =
The diameter of the cheek plate should be larger than the diameter of the shackle eye such that when fully locked, the entire eye is in full contact with the cheek plates.
14.2
mm  
  Pin Diameter, B =
Padeye hole to be 3mm wider than pin diameter.
mm  
  2) INPUT FORCES        
 
 
       
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
  Pulling Load on Pullhead (Padeye), Fpull = MT  
  In-plane angle, α = deg  
  Out-of-plane angle, β = deg  
  Padeye Material Yield Stress, Fyield,padeye = MPa  
  Material Young's Modulus, E = 206000.0 MPa  
  3) RESULTS  SUMMARY        
  Bearing Stress  =    
  Block Shear =  
  Cheek Plate Weld Stress =  
  Shear Stress in Section A-A =  
  Tensile Stress Section B-B =  
           
  4) CALCULATIONS        
  Bearing Stress        
  Allowable Bearing Stress, 0.9Fyield = MPa  
  Bearing Stress = = MPa  
  Ratio =  
  Block Shear        
         
           
           
           
           
           
           
           
  Ratio =  
  Cheek Plate Weld Stress        
  Min Weld Thickness Required = mm  
  Weld Thickness = mm  
  Effective Weld Thickness, t,weld effective = mm  
  Weld Stress = = MPa  
  Ratio =  
  Shear Stress in Section A-A        
  Fig-Model        
           
           
           
           
           
           
  Allowable Shear Stress, 0.4Fyield = MPa  
  Shear Stress in Section A-A = = MPa  
  Ratio =  
  Tensile Stress in Section B-B        
           
  Fig-Model        
           
           
           
           
           
           
  Allowable Tensile Stress, 0.6Fyield = MPa  
  Tensile Stress in Section B-B = = MPa  
  Ratio =  
           
  Combined Stress in Section CC      
           
         
           
           
           
           
           
           
  Shear Force, F2 = kN  
  Shear Stress, σshear = = MPa  
  Ratio =  
  Allowable Bending Stress, 0.6Fyield = MPa  
  In-Plane Bending Stress, σip = = MPa  
  Ratio =  
  Allowable Bending Stress, 0.6Fyield = MPa  
  Out-of-Plane Bending Stress, σop = = MPa  
  Ratio =  
  Unity Check =  
  Padeye Weld Check        
  Thickness of baseplate/ deck, tbase =  = mm  
  Min Weld Thickness Required =
Minimum between 0.7 of baseplate/deck thickness or main plate thickness
mm  
  Weld Thickness, tweld =
Weld thickness should be equal or less than 0.707 x Thickness of Cheek plate.
 
  Effective Weld Thickness, t,weld effective = mm  
  Shear Stress in Weld = MPa  
  Ratio =