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  1. zsa

    Least material condition applications in this drawing- help!

    Hello! I am having a little bit of trouble trying to understand /decipher the least material condition and its affects on this diagram. the underlined width of 48+-1 with a LMC modifier,not sure what this means physically? the wdith of the part with a poisition tolerance is the tolerance for the...
  2. zsa

    GD&T- profile tolerance and basic dimension

    Attaching the print/drawing in question. In terms of the gd&t governing the basic dimensions for length and width of the box, I am not certain how to translate the gd&t into relatable plus minus tolerance for our shop floor. For the 718 basic dimension, I know that if only one end had the...
  3. zsa

    GD&T (ASME Y14.5/ISO) non cylindrical tolerance zone

    Hi Everyone, I could really use some help with something that I just came across. I am trying to determine what kind of functional gauge i would need for some parts that we make in my company and I am relatively new to the manufacturing industry but eager to learn(I know there are professionals...
  4. zsa

    Impact testing of annular plates vs bottom plates

    Hi all, I am currently working on an AST project where the MDMT is -20 C- due to which we cant use our usual go to material, A-36, for shell and annular plates unless its impact tested (understandably so). Long story short, after discussing with our client, all shell plates above ~14mm are...
  5. zsa

    material help: BS1501-151-28A

    Hello, My company has to verify the design of an old vessel for seismic loads. The material used in that vessel is BS 1501-151-28A, which, I understand, was used widely in the 70's but is not available anymore. Can anyone tell me what the ASTM equivalent to this material is? I read different...
  6. zsa

    Supported Tank Roof General Queries

    Hi all, I have certain queries that I hope that the good people here will help clear out so that I may better understand 1) API 650 5.10.4.3 states that 'Rafters shall be designed for the dead load of the rafters and roof plates with the compression flange of the rafter considered as...
  7. zsa

    Shell course plate thickness

    Hello, Currently designing a tank in which the shell bottom course comes out to 10 mm and all other courses are 6 mm. Can I use a 10 mm plate for the bottom course and directly use 6 mm for the other courses, or is it a better engineering practice from a fabrication and operation point of...
  8. zsa

    Vessel cleat/clip design

    Hi, A colleague of mine is designing a pressure vessel and came across the following design concern: He needs to model a support for a load of 60kN and needs to design a vessel clip/cleat for attachment. So the question is this, is there any standard or software pertaining to this issue (he...
  9. zsa

    Storage tank with compartments

    Hey all, Got a design query that I need your input on. A client wants us to design an atmospheric storage tank (for methanol) with compartments. He provided us with a picture of what he wants, a copy of which I'm attaching for your reference. My question is this- for the compartment 'walls' is...
  10. zsa

    Pipeline alignment sheets

    Hi, Recently started dabbling in pipeline design at work, and came across a term 'Reduced level at point of intersection' on the pipeline alignment sheets showing the plan and profile for the pipeline. Would anyone be kind enough to explain what this means exactly? The pdf is attached in the...
  11. zsa

    API 620 dome roof- self supporting or with roof structure?

    Hi all, Designing an isomerate storage tank based on API-620 (on AME tank) with the following parameters: Design Pressure: 6.72 psig Tank Diameter: 50 ft Tank Height: 39.3696 ft According to the design calculations, I ended up with the following: 6 shell courses with the following thicknesses...

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