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Bending stress in horizontal pressure vessel saddle base plate

Bending stress in horizontal pressure vessel saddle base plate

Bending stress in horizontal pressure vessel saddle base plate

(OP)
I am looking for a correct formula for the bending stress in the saddle base plate of a horizontal pressure vessel.  The current formula I have has incorrect units.  

fb = [(6*M)/(tb^2)] is the formula I'm using (units of lb/in instead is lb/in^2), where fb = bending stress, M = bending moment, tb = base plate thickness.

I have limited access to references so I would appreciate any formula or online reference site anyone could provide.  

Also, if this is the correct formula could someone explain to me why the units are not in psi.

RE: Bending stress in horizontal pressure vessel saddle base plate

the formula should be fb={(6*M)/[wb*(tb^2)]}, where wb is the base plate width

RE: Bending stress in horizontal pressure vessel saddle base plate

What is implied in the first formulation is that M for the check corresponds to wb=1 in, i.e., is the moment that acts on a 1 in wide strip.

M in the second formulation would be the one acting in a full wb.

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