Topic - 20 Strength of Steel Hatch Covers

1.                   Plating

The thickness of the plating of steel hatch covers is not to be less than 0.01s or 6 mm (0.24 in.), if that is greater, thickness of the plating of steel hatch covers is not to be less than=7.08 mm

Finalized steel hatch covers plating thickness =  mm

2.                   Webs and Stiffeners

The scantlings of steel cover primary and secondary webs or stiffeners are to have a section modulus, SM, and a moment of inertia, I, in association with the plating to which they are attached, not less than obtained from the following equations:

SM = psl²/U cm3 SI       (3-2-9/7.1)

                                                    = cm³

                                                 I = psl³ cm4 SI Units

                                              = cm⁴

     Depth considered =  in.

     Web thickness =  in.

     Flange thickness =  in.

     Flange width =  in.

                                         SM_required =  cm³

Still water Bending Moment =  kNm

Section modulus                    =  mm³

SM_calculated                              =  mm³

 SM_required                               =  mm³