1. Shell Plating

2. Shellplating purpose: keeps water out ties together ship’s framework
plays important part in resisting longitudinal bending stresses
needs to be stronger amidships than at the ends
particularly at the deck and bottom

3. Shellplating is… stiffened by frames supported by frames
composed mostly of rectangular steel plates
arranged longitudinally

4. Shellplating strake shell plating arranged longitudinally
one plate after another
a row
a course

5. 3 Types of Shell Plating
flat plate
rolled plate
furnaced plate

6. Flat Plates doesn’t have to be “worked” into shape because of this…
therefore, most economical
because of this…
majority of plates are flat plates

7. Rolled Plates curvature in only one direction
most often found at the turn of the bilge

8. Furnaced Plates curvature in two direction
must be heated and pressed into desired shape by placing heated plate over a form
most expensive
avoided as much as possible because of expensive

9. developed by a yard in Germany built entirely of flat surfaces
builders of the battleship “Bismarck”
built entirely of flat surfaces

10. Layout of Shell Plates greater Girth mid-ship then at ends
Girth: distance around the hull
results in excess plating at the ends
therefore, certain strakes (rows) are dropped as bow and stern are approached

11. Drop Strake
dropped strake, top strake of the two involved, is called the Drop Strake

12. Through Strake
the other strake, the bottom of the two involved, that runs through in continuous line from stem to stern is called the Through Strake
see expansion plan

13. Stealer Plate
The “new” single plate that butts up against the two strakes involved, is called the Stealer Plate
it is necessary due to the reduction in girth

15. Butts and Seams Butts Seams transverse joints between the plates
longitudinal joints between the plates

16. Names and Letters of Strakes

17. Thickened Plates…
certain plates are thickened in areas of higher stress
sheer strake
keel plates
plates on the bottom forward (pounding)
bottom and bilge
margin plate (provides more substantial material for connection of outboard ends of floors and for the frames, also protect against more rapid corrosion in this area)
(deck stringer) outboard most strake on deck

18. Thickened Flat Plate Keel
notice: molded surface in the same plane

19. Reference pg. 201 Steel Merchant Ships

21. Numbering and Lettering
Shell Expansion Plan
notice:
lettering from keel strake and up
numbering: from aft forward
aft
FWD

22. Plan of Deck Plating aft Deck Stringer Strake Stringer Strake
outer most strakes on deck
Stringer Strake
aft