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  1. zakk

    Quench/temper of normalize material

    Thanks, Metengr. Much faster response than my A.I., who has to take it back to Design Survey (days/weeks). I was aware of UG-85, but wasn't sure if I could apply it to other forms besides plate. We are working with closed and open die forgings. Again, something for our A.I./Design Survey to...
  2. zakk

    Quench/temper of normalize material

    We have forgings supplied in accordance with ASME SA350-LF2 Class 1 in the Normalized condition (P1 Group 2). The hardness came in between 130 and 140 HBN, which is too soft for our application (galling issues). We segregated a portion of the material to which we applied a quench and temper...
  3. zakk

    Flat Heads and UG-34

    SnTMan; What we are trying to do is design a clamp connection similar to Appendix 24, except replace one of the Hubs by a Flat Head. I attached a sketch of a general configuration. According to Fig UG-34(m) for a mechanically locked Head, the diameter "d" should be taken as the outside...
  4. zakk

    Flat Heads and UG-34

    We are designing an assembly subject to internal pressure that will use a circular flat head that is retaining mechanically at the outer diameter (Fig UG-34(m)). The head must meet Sec VIII Div 1. Is the Equation 't = d*sqrt(CP/SE)' only applicable to the plate center where maximum bending...
  5. zakk

    Welding Q&T P1 Steels

    Thanks for the replies. Weldstan: The material is essentially SA350-LF2 Class 1 with 46 ksi minimum yield. That covers all three grades. The A105 will be manufactured to a fine grain practise to satisfy the requirements of SA350. Metengr: I agree normalizing is a better way to go, but the...
  6. zakk

    Welding Q&T P1 Steels

    We are manufacturing a vessel/pipe fitting from triple certified material, i.e. SA105 / SA350-LF2 Class 1 / ASTM A694 Grade F46. Our Regulatory Authority (R.A.) has stated that they will register the fitting in the Normalized only condition. Our Material Supplier says to consistently achieve...
  7. zakk

    Solver Non-Negative Variables - VBA command

    I didn't see the "AssumeNonNeg" function in MSDN until you listed it. It is there. My Bad! Thanks IRstuff.
  8. zakk

    Solver Non-Negative Variables - VBA command

    I am writing an Excel 2010 VBA code that calls Solver and I need to tell Solver to uncheck the "Make Unconstrained Variables Non-Negative" box. The default is "True", ie. the box is checked. When I uncheck the box and run my code, and ask Solver to return the state of the box...
  9. zakk

    External Pressure on a Flat Head

    Are there rules in ASME Sec VIII Div 1 that covers the design of flat heads on a vessel under vaccuum?
  10. zakk

    How do I cut the sharp knife edge off of a thread start

    What you are trying to do is known as a "Higbee Cut" or "Blunt Start" of a thread. I've done it on Solid Edge, but I haven't sat down and figured it out on SW, but I'm expecting the process to be similar. In Solid Edge, there's a command called Helical Cutout. You create a plane at the point...
  11. zakk

    Old ASME Allowable Stress Criteria

    Thanks, JT. You get a star!
  12. zakk

    Old ASME Allowable Stress Criteria

    Does anyone have a copy of ASME Section II Part D prior to the change in the Allowable Stress Safety Factor from 4.0 to 3.5? S(Allowable) = S(Tensile)/4.0 I need to know, from Table 1-100 the safety factor used for establishing the allowable stress using YIELD STRENGTH. In 2007E...
  13. zakk

    NACE MR0175 and PWHT Requirements

    strider6 - I agree with your statement re: WPS. In an earlier post, you stated: "... WPS / PQR tells you that if you do the weld following the WPS you'll have always hardness within the limits". However SJones stated: "the PQR in no way guarantees that the final weld has a hardness that...
  14. zakk

    NACE MR0175 and PWHT Requirements

    SJones - agreed! The Purchaser pays the bills, so it will be pretty obivious how this will get resolved. I just need to know if I'm interpretating the NACE Spec correctly. We can do a surface survey, but there is nothing in MR0175 that deals specifically with this method (only cross sectional...
  15. zakk

    NACE MR0175 and PWHT Requirements

    How would you perform hardness testing on the production weld that would meet MR0175? Figures 2,3 and 4 depict a hardness survey of the weldment cross-section (for WPS qualification purposes), not the inner and outer surface accessable on an actual vessel plate. Would I need to make a...
  16. zakk

    NACE MR0175 and PWHT Requirements

    Just to clarify: NACE MR0175 Section A.2.1.4 first two paragraphs state welding and weld hardness shall be determined in accordance with 7.3.3 and acceptable hardness shall be per Table A.1. These two paragraphs only pertain to the Weld Procedure Qualification, not the actual production...
  17. zakk

    NACE MR0175 and PWHT Requirements

    Thanks, Strider6. PWHT is not mandatory under ASME Sec VIII Div 1 in this case. Our Customer stated that regardless of the hardness to qualify the WPS, the actual production weld may exceed 22HRC, and therefore PWHT should be done regardless. I will pass the info in your post along to them.
  18. zakk

    NACE MR0175 and PWHT Requirements

    We are welding A516-70 plate for a vessel that will be exposed to sour service. Are we required to PWHT, even though the hardness tests on the weld procedure (WPS) used for construction does not exceed 22HRC in the as-welded condition?
  19. zakk

    MAWP of a Thread-o-let

    I just can't let it go... MSS SP-97 para 2.2: ...Within these limits the maximum allowable pressure of a fitting shall be that computed for straight seamless run pipe of equivalent material...The wall thickness used in such computation shall be tabulated in B36.10M for the size and applicable...
  20. zakk

    MAWP of a Thread-o-let

    NPS1/2 XH, 1/8" CA, 14tpi tmin = 0.875*tnom - CA - Thread Depth (0.8/n) tmin = 0.875(0.147") - 0.125" - 0.057" = -0.053" Thread-o-lets are not covered under B16.9 or B16.11. Which B16 Code can you find them? Bonney Forge references only MSS SP-97.

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