Title Transverse Racking
Name Admin Date 2014-01-18
File
              Transverse Racking :
    
           
to know the condition of the container stacked on deck when the vessel encounters swell with rolling;
 
Test Load : 20,000 kgs ( ISO : 15,240 kgs )
Pressure Calculation:
Cylinder dia: D = 150 mm,    d: 80 mm
+ Effective Area:
( Push ) : S¹ = π D² / 4 = 17662.5 mm²             
( Pull )  : S² = S¹ - πd² /4 = 12638.5 mm²
∴ Pressure Required:
( Push ) : 2,000,000 / S¹ = 113.2 kgs/ =11.1 Mpa
( Pull )  : 2,000,000 / S² = 158.2 kgs/ = 15.5 Mpa
 
Check Points:
            + Rear / Front : Diagonal deflection.
             + Acceptable Limit: During : A + B = ≤ 60 mm, Final : ≤ 10 mm
A : Changed length, B : Changed length

Diagonal A + B


3482 : Before, 3459 : during , 3479 : after ( PUSH )
 3504 : during, 3483 ( after )  ( Pull )
 
During: 23 mm + 22 mm = 45 mm ( within tolerance )
   Final: 3 mm + 1 mm = 4 mm ( Within tolerance )
 
Why 15,240 kgs against 150 Kn stipulated in ISO ?
 
    a) region by latitude: gravity  to be applied: 9.84
    b) by height ( center between south pole & north pole ) :
                           gravity to be applied : 9.807                                  
                   In general, while 1 Kgf=9.81 N
   However:
           It applies a) : 150Kn / 9.84 x 1,000= 15,243.902 : 15,240 kgs
               Whereas,
          It applies b) : 150 / 9.807 x1,000 = 15,295.197 kgs.
+++++++++++++++++++++ End  Report ++++++++++++++++++
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