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  1. CrisDom

    Extent of UG-44(b) to ASME I equipment

    Thanks TGS4, I actually would approach the design as if I were in a general ASME design project. Actually ASME I is strictly for boilers and there are no rules for bolted flange connections. However I have flanged connection in my drum (that is not a boiler, nor a steam generator, but just a...
  2. CrisDom

    Extent of UG-44(b) to ASME I equipment

    I'm designing a vessel according to ASME I and I'm wondering whether it's advisable/mandatory to check ASME B16.5 rating against external loads. To be on the safe side, I decided to perform this check, considering also the statement in PG-22.1: Stresses due to hydrostatic head shall be taken...
  3. CrisDom

    UW-20 for U-tube HE

    Thanks Maslov, I got it. I was actually focused on Ed.2021, since I'm dealing with an old project and actually I didn't find the same statement in Ed.2021, so I was trying to understand what is the correct approach. However thanks a lot for your indication. Regards
  4. CrisDom

    UW-20 for U-tube HE

    Dear All, is UW-20 applicable to U-tube heat exchangers? ASME VIII Div.2 states that "Determination of tube-to-tubesheet joint strength is not mandatory for U-Tube tubesheets" (ref. Para. 4.21.1.1 (d)). I cannot find any similar statement in ASME VIII Div.1, but it should be the same. Can...
  5. CrisDom

    Lowest Stress Ratio for Shell Side Heat Exchanger (ASME VIII Div.1/Div.2)

    Dear All, I've a doubt regarding the evaluation of the lowest stress ratio to be used to calculate Hydrotst Pressure for Heat Exchanger Shell Side. I usually consider the main components for both Tube and Shell Side and I always consider exchanger tubes for both sides. Actually I'm wondering...
  6. CrisDom

    Lowest Stress Ratio for Heat Exchanger Shell Side (ASME VIII Div.1/Div.2)

    Dear All, I've a doubt regarding the evaluation of the lowest stress ratio to be used to calculate Hydrotst Pressure for Heat Exchanger Shell Side. I usually consider the main components for both Tube and Shell Side and I always consider exchanger tubes for both sides. Actually I'm...
  7. CrisDom

    Definition of "CLUSTER" mentioned in ASME VIII Div.1 para. UG-36(c)(3(-d)

    Hi folk, can anybody help my to understand the correct meaning of "cluster" mentioned at para. UG-36(c)(3)(-d)? I'm trying to understand wheter my 3 openings (N4, N3 and N10) are 3 unreinforced openings in a cluster. Actually they're unreinforced, I mean that, as per Code rules, they do not...
  8. CrisDom

    Optional type flanges per ASME VIII Div.1 Appendix 2

    Dear All, I'm facing some issues relevant to optional type flanges with my colleagues. First of all, I'm quite sure ASME VIII Div.1 Appendix 2 doesn't specify any limit for the use of loose flanges (in case I'm wrong, please, tell me!!). Based on that, in case I need to strengthen my flange...
  9. CrisDom

    PFHT vs PWHT

    I found the Interpretation relevant to ASME VIII Div.1 (VIII-1-95-50): Question (1): A cold formed head has to be heat treated to fulfill the requirements of UCS-79(d) in Section VIII, Division 1. Does the term "heat treated subsequently" mean just after forming and prior to any other...
  10. CrisDom

    PFHT vs PWHT

    Hi folk, I'm having a discussion regarding PFHT/PWHT. If a vessel is to undergo PWHT, is there the need to PFHT the heads before PWHT? I think there is no need, but someone is asking "where it is written". I replied asking where is written that "there is the need", but I got no answer. So, I'm...
  11. CrisDom

    Hole in a Blind B16.5 smaller than 1"

    Mike, I'm in ASME VIII Div.1 and I know there are rules for openings in flat head. I don't have difficulties in calculating blind and its opening; as you can imagine, the problem is not the opening, but the blind itself, since the calculated thk in seating condition is quite higher than the...
  12. CrisDom

    Hole in a Blind B16.5 smaller than 1"

    LittleInch, unfortunately I'm not in a position of adopting a different solution, since I've to design a vessel with a 1/2" nozzle, a 1/2" WN flange and a 1/2" blind with a threaded hole 1/2" NPT. I suggested to my client to use a threaded flange instead, but, for this particular case, he is...
  13. CrisDom

    Hole in a Blind B16.5 smaller than 1"

    Does anybbody know what to do in case I have a drilled blind smaller than 1"? ASME B16.5 Table 6 starts from NPS 1. I'm afraid I've to calculate blind smaller than 1" as non std in case I have to drill it with a central hole... Thanks
  14. CrisDom

    Joggle joint per Fig. UW-13.1(i) in corrosive service

    Thanks Mike, my doubt comes from an Italian Code that doesn't allow this particular joint in case of corrosive medium, but actually it seems to me that ASME doesn't specify any limitation regarding service issues (even though I don't like this geometry in case of corrosive medium). Thanks for...
  15. CrisDom

    Joggle joint per Fig. UW-13.1(i) in corrosive service

    Is a joggle joint according to Fig. UW-13.1(i) allowed for vessel in corrosive service? Thanks Regards
  16. CrisDom

    Weld size parameter "c" in ASME VIII Div.2

    You're referring to Div.1 for definition of "c", whereas my doubts are relevant to Div.2, where "c" is not clearly identified. So I think it's better to split Div.1 and Div.2, in order to avoid confusion, since symbols and definitions are different. Moreover I don't agree with you when you say...
  17. CrisDom

    Weld size parameter "c" in ASME VIII Div.2

    goutam freelance, I agree with your safe option, but I just would like to know the correct interpretation of ASME sketch. You know that Code is Code, so it would be hard to say that something is wrong. r6155, I agree with you that Table 4.9.2 Detail 2 is wrong, but is there any official...
  18. CrisDom

    Weld size parameter "c" in ASME VIII Div.2

    Dear r6155, I caught your point. However, I think Div.1 App.2 sketches are quite clear. Moreover App. 2 clearly defines "c" value as the smallest between tn and tx. So, based on the numerical value of "c", you can determine the min dimensions for welds (case by case, depending on specific...
  19. CrisDom

    Titanium time-depndent properties

    Dear All, I've to design a vessel using Titanium (SB-265 Gr.2). Design T is 300°C and, based on ASME Sect.IID, it seems to me that no creep phenomena are foreseen (indeed no note T relevant to time-dependent properties are recalled for Titanium materials). Is that correct? Actually an old...
  20. CrisDom

    Weld size parameter "c" in ASME VIII Div.2

    Dear r6155, "c" is not the weld throat, since "tc" (in Div.2) or "0.7c" (in Div.1) is the weld throat. Regards

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