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Recent content by MDDSI

  1. MDDSI

    Scalloped Stiffening Rib

    It's one of those things that works really good for everyone other than engineering.
  2. MDDSI

    Scalloped Stiffening Rib

    So far so good as far as they are concerned. Of course, the task now would fall on us to make sure its not going to fall apart, which is where I am starting to pump the breaks. Glad to hear that someone else sees some issues with this design. Nevertheless, I am going to have to justify why if...
  3. MDDSI

    Scalloped Stiffening Rib

    Jayrod, The flat bar thickness varies depending on where we would apply it. This is more of predesign research phase. 1/2" thick typical. I forgot to mention one other big reason this design is desired. This is going to be in an environment where the prospective customer would require full and...
  4. MDDSI

    Scalloped Stiffening Rib

    Picture attached. I am posting here because I am at wits end on how to handle this situation. My company often deals with large flat surfaces that are subject to typically low pressures (approximately 1 psi). In the past, a stiffening rib has been added to the surface to help rigidity - usually...
  5. MDDSI

    Maximum Height of Rectangular Beam?

    Thanks for the replys, Yes, its a pretty low pressure, we mostly deal with spray dryers/ducting. So while the pressures are low, the steel is typically 12 gauge, so not all that strong. It may be that my method of solving the stiffening rib sizes is overly conservative. Again, I break it down...
  6. MDDSI

    Maximum Height of Rectangular Beam?

    I am curious is there is a real limit to the height to thickness ratio of a rectangular cross section on a beam? We are considering a vessel with a wall consisting of a large, rectangular flat plate. The whole vessel will need to withstand pressures from fans, which results in around 1 psi of...
  7. MDDSI

    Fixed End Condition Inside Cylindrical Shell

    I am having some debate with coworkers on the requirements of a fixed end condition on a beam. In theory, a fixed end should allow for a "weaker" beam for any given load as opposed to a simply supported beam. In particular, I am concerned with how the moment at the ends of a fixed beam may...
  8. MDDSI

    Large Steel Vessel Design

    I am a chemical engineer working on a rather mechanical/structural engineering oriented project - sizing explosion venting for a future spray dryer. NFPA does a good job of explaining how to come about the needed venting area, but the thing I am hung up on is how to calculate the design pressure...
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