Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by AgsMyDude

  1. AgsMyDude

    Practical Implications of Impact Testing

    Thanks Steve, are you implying that an impact toughness spec typically results in a heat treatment of the base metal to achieve the desired toughness value? I think this may be the gap in my understanding. Heat treatment is only mentioned sparingly in paragraphs relating to low temperature service.
  2. AgsMyDude

    Practical Implications of Impact Testing

    Thanks GD2, I understand MDMT selection and the purpose of Fig. 323.2.2-1. What I'm struggling with is the fundamentals of specifying a material that requires impact testing. Why would we expect an impact-tested material to perform any better than the same material that has not been impact...
  3. AgsMyDude

    Practical Implications of Impact Testing

    Thanks for the response. I read that toughness testing is typically required as a part of material specs but additional testing per Table 323.2.2-1 is required to use the material below its line in Fig 323.2.2-1. What happens in this instance? Are we just *hoping* the material comes back...
  4. AgsMyDude

    Practical Implications of Impact Testing

    I've always specified materials that don't require impact testing but I don't have a great understanding of what the practical implications would be if the testing is required (for instance if A53B is specified for use below its curve in Fig 323.2.2-1 of B31.3). In a general sense... Does it...
  5. AgsMyDude

    B31.1 Butt Weld vs. B31.3 Groove Weld

    I was attempting to compare visual examination acceptance criteria between B31.1 and B31.3 and am getting tripped up by the different terminology used by each code. B31.3 seems to favor the term groove weld in Table 341.2-1 while B31.1 uses butt weld in Table 136.4.1-1. In my experience, large...
  6. AgsMyDude

    ASTM A403 Fittings - W vs. WX vs. WU

    I guess I would also ask in the case of Class W, why does it matter whether the weld is made at the mill or by the fitting manufacturer?
  7. AgsMyDude

    ASTM A403 Fittings - W vs. WX vs. WU

    Thanks, Table 6 was indeed helpful and we will stick with the client spec since Class W will not meet their requirements. Just to confirm "starting material manufacturer" = "starting pipe manufacturer" = "mill" =/= "fitting manufacturer"?
  8. AgsMyDude

    ASTM A403 Fittings - W vs. WX vs. WU

    We have a client specifying A403 Class WX or WU fittings and I'm trying to understand the practical difference between these options and Class W, which is what our standard spec calls out. Based upon my reading of 5.4, 5.5, and 5.6, my understanding is that: Class W requires radiographic...
  9. AgsMyDude

    Guideline for Emulsified Sulfur Pumping System

    We'll be pumping ~67% emulsified sulfur from one tank into another. I've been told the viscosity can be as high as 10,000 cP however, I need the flow behavior index (n, unitless) to accurately model it in our hydraulic software. Absent that information, are there any general guidelines (e.g...
  10. AgsMyDude

    Resource for Rules of Thumb on Equipment Maintenance Cost

    Thanks for the responses all, unfortunately we do not have maintenance requirements or data for existing equipment. This is a conceptual life-cycle cost estimate activity. Likely the best approach will be to just apply a uniform percentage of ~5% across all equipment types, similar to the rule...
  11. AgsMyDude

    Resource for Rules of Thumb on Equipment Maintenance Cost

    Does anyone have a good reference with rules of thumb for estimating maintenance cost requirements of various types of process equipment compared to capital cost? I have a copy of Plant Design and Economics already but I am looking for something more granular based on the type of equipment. I...
  12. AgsMyDude

    Welded vs Seamless ASME B16.9 Fittings

    I have seen 24" listed as the maximum size for A234 WPB (seamless) fittings; beyond that they are welded (WPB-W). Is there a standard that actually specifies this as as the breakpoint? Additionally, their pressure ratings should both be equivalent to seamless pipe if built to B16.9 (para 2.1)...
  13. AgsMyDude

    B31.8 and API 5L Annex G CVN vs DWT

    Thanks all, Not being familiar with ASTM A370, it was not clear to me that full size specimen =/= pipe body. That clears it up.
  14. AgsMyDude

    B31.8 and API 5L Annex G CVN vs DWT

    Thanks a bunch Steve, very helpful. I assume DWTT also produces energy values? Equations 1 and 2 in para 841.1.2 of B31.8 note the calculated CVN values as being "full size Charpy V-notch absorbed energy". That would indicate to me that these are in fact DWTT, not charpy tests. Annex G also...
  15. AgsMyDude

    B31.8 and API 5L Annex G CVN vs DWT

    I am reviewing a specification for a gas pipeline (material API 5L PSL2) with a minimum temperature of -50F. According to B31.8, this triggers Annex G of API 5L. I am really struggling to sort the actual requirements of CVN and/or DWT testing. - My understanding is that shear area is calculated...
See more

Part and Inventory Search

Back
Top