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  1. JCrash

    Flat Head with Retaining Ring UG-34(m)

    When using a retaining ring (Figure UG-34(m)) to hold in a flat head, I have to maintain a factor of safety of at least 4 against all possible means of failure, per UG-34(d). One of the listed failure modes is radial deformation (flaring of the end of the vessel). The code doesn't provide any...
  2. JCrash

    Impact testing for all welds, no matter how small?

    Lets say I have a pressure vessel being built to ASME Section VIII Div 1. The main portion of the vessel is a rolled cylinder (SA-516 Gr 70) that requires impact testing due to an excessively large weld (>6" governing thickness). Therefore, per UCS-66 and UCS-67, i need impact testing on my...
  3. JCrash

    Mis-machined Flat Head

    Designing a vessel to ASME BPVC Section VIII Div 2. We have a flat head (SA-516 Gr 70) that has geometry as shown below: ________ | | | | | | | | | | | | > | (These v's are RTJ grooves for a flange face) |________| ________ (This is a...
  4. JCrash

    Section VIII Div 1 - UG-84 (i)

    Under "Vessel (Production) Impact Tests Plates" (UG-84 (i) of Section VIII Div 1), there is the following statement about the materials used to make the test plate: "The vessel impact test plate shall be from one of the heats of steel used for the vessel..." What's a valid interpretation of...
  5. JCrash

    SA 105 impact test values

    Just a quick question - I'm looking for criteria for impact testing SA 105 with a 50F MDMT. I've found supplementary requirements for SA 516, but no such parallel for SA 105. Any guidance would be appreciated.
  6. JCrash

    Studded Outlets per Section VIII div 2

    In performing area reinforcement calculations (in accordance with section VIII div 2) for a studded outlet with a machined flat, I have noticed the results do not line up well with an FE model. When I perform the same calculations for a welded on nozzle, the FE model follows very accurately...

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