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  • Users: Crompto29
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  1. Crompto29

    Equivilant ASTM bar spec to A516?

    I am trying to specify the material for door handles and no stress lugs etc. ASTM A516 is plate. What is the equivilant for bar? ASTM A675??? What is the spec for general purpose readily availible round and flat bar for vessel handles and attachments etc? Thanks,
  2. Crompto29

    PD 5500 - Pressure Area Method for Openings under External Pressure?

    I design allot of set-in studded pads into vessels. Under internal pressure I use the alternative pressure area method. However I now have a project with external pressure. Can I use the pressure area method for external pressure? My 3rd party design appraiser says go for it, however PD...
  3. Crompto29

    Von Mises isn't always good enough by its self?

    Example: If I am modeling a complex object like a weld neck flange, there can be areas where the three principle stresses are positive, similar and well above yield, however according to Von Mises Criterion the Equivalent Von Mises Stress is close to zero. i.e. if s1=s2=s3~800MPa then Svm~0...
  4. Crompto29

    Interpreting FEA Stresses - Primary or Secondary?

    I have a Rectangular door that is to be welded into a Ellipsoidal Head. I have completed an FEA analysis but have been unable to confidently catagorise the stress in the head around the outside corner of the door frame and have therefore had it contracted out. They have since returned their...
  5. Crompto29

    Why does PD 5500 have a maximum Nozzle Thickness?

    I am designing a manway for a Vessel. The vessel shell thickness is 10mm. I would like to weld a 40mm thick 600mm diameter manway into the vessel. It will be 300mm deep. So essentially it is a set through nozzle. The manway door is inside the chamber and self seals to the end of 40mm thick...
  6. Crompto29

    Large Rectangular Door in Ellips Head

    I am designing a 1800mm high by 800mm wide doorway of 80mm thickness into a 2300ID Ellipsoidal head. The Pressure is 6 barg and material is A516 Gr70. See Attached Drawing. I have designed the Door way so that it will hold up to all the loads on it before it is even welded into the Head. I...
  7. Crompto29

    ASME VIII - Appendix 13 - Sketch 6 Spreadsheet issue

    Hi there, I have converted all of Appendix 13 (Non-Circular Vessels) into a spreadsheet. I am having a problem ironing out the errors in the more complex Sketch 6. Is anyone an expert on this? I am prepared to give all my Appendix 13 spreadsheets if someone wants to work with me on this. Is...

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