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  1. cast16

    Water tank ribs dimensioning

    The customer specializes in surface treatment tanks and has submitted an initial tank design. Our role as fabricators is to complete the design, verify its integrity, and assume responsibility for the project. While a structural engineer will become involved later in the process, we are...
  2. cast16

    Water tank ribs dimensioning

    Hi Compositepro, It is a customer design. They are using a 150x10mm flat bar. It is working fine with FEA and calcs. I think you are right about the reason you don't see usually high flat ribs. I was going to flag this to the customer, but I would like to back it with a statement from experts...
  3. cast16

    Water tank ribs dimensioning

    Hi all, Rectangular tank with flat bar ribs. I remember reading somewhere that there is a limit in the ratio height/thickness of the flat rib you can use, but I can't find it. Does such a thing exist in any guideline and what is the value?
  4. cast16

    Rectangular tank

    I tried to replicate in Nastran the example in the book of Kanti Mahajan(see screenshot). The deflection in the book is around 40mm - in Nastran 7.5mm Another example from another book (Design_of_Welded_Structures_Omer_W_Blodgett). The deflection in the book is around 110mm - in Nastran 25mm
  5. cast16

    Rectangular tank

    I did look. I think the formulas in the screenshot below (case 8d) is the best option. I think I should apply it for the triangular part of the pressure 5.88kN/m2, and the previous formula (second screenshot case 8a) for the continuous pressure 14.7kN/m2. Tell me if I'm wrong. I want to use the...
  6. cast16

    Rectangular tank

    I'm just assuming it because the stiffeners are welded to the wall/panel. Correct?
  7. cast16

    Rectangular tank

    Everyone is talking about Roark's formulas. What is confusing for me: the pressure in this case doesn't start from zero... Do I have to consider effects of 2 pressures (one constant 14.7 kN/m2 and one increasing to 5.88 kN/m2) and add them together? Also, is the case of "rectangular plate all...
  8. cast16

    Rectangular tank

    Hi what formula would you use to calculate the deflection and stress on the portion of the tank's wall showing in the screenshot below? Let assume the tank is full with water, open top and ignore the atmospheric pressure. Material S275 6mm thick Thanks
  9. cast16

    Shaft and bushes calculation

    Hi all I am designing a lifting tool which will be used to lift a 2000kg concrete slab. Please have a look to the screenshots below. I need to dimension a suitable shaft for the points 1 and 2, but don't know where to start. I guess I would need to calculate the radial load at point 2, Will it...
  10. cast16

    Shaft boss best connection

    Hi all I need to design an engine conveyor like that in the attached pictures. I just have some pictures taken from my colleagues. My problem for the moment is understand which would be the best connection to the shaft of the end hardened boss/sleeve. I know it need to be keyed for the...

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