MOORING BRIDLE PLATE OR PADEYE DESIGN VERIFICATION  
  Padeye Check  
http://www.calqlata.com/prodimages/PadEye%202-5.png
 
  1) GEOMETRY    
 
Three dimensional image of typical padeye
 
   
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
     
       
       
       
       
       
       
       
  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       mm  
  Internal Width, A       mm  
  Eye Diameter, F       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       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