I don't understand what the hidden lines are nor the fillets tangent to the center line of the circles if someone can help with the 3d isometric that would help a lot. 
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Youssef Mohamed
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This is just a stiffener that goes around the cylinder that runs across the walls
Section View
FUll isometric view
NMech
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Ok thanks a lot , I have another question will this be treated as a rib or not because in my course when there is a rib we don't hatch it in sectional views , so should I hatch this or not ? – Youssef Mohamed Dec 26 '21 at 21:52

