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  1. Vattappilly

    Base Plate Design for Type. 2 Saddles

    Does anyone there know the basis of Dennis R Moss method for Designing base plates for Type.2 saddles? I am looking at the Pressure Vessel Design Manual, Third Edition? In the overall length of Lw, what is d1? Is it the distance from the edge of the base plate to the first rib? What is the...
  2. Vattappilly

    Post weld Heat Treatment Section. I and VIII

    Thanks for the comments metengr and weldtek. I can't fully understand metengr's comments about the pressure vessel steels. I mean both Table PW-39 as well as Table UCS-56 talk about more or less same materials, I mean same P numbers. So I don't get why they treat it conservatively in Section.VIII.
  3. Vattappilly

    Post weld Heat Treatment Section. I and VIII

    I believe in ASME Section.I, PW-39 doesn't mention about thermocouples. In Section.VIII div.1, I guess UCS-56 doesn't talk about it although UW-40 mentions about it in UW-40 (c). The reason why I brought this up is because we send all section.VIII vessels outside for PWHT just because we do...
  4. Vattappilly

    UG-42

    Can anyone enlighten me about UG-42 rules? For a 50 psi vessel, On almost all cases, I find that we can do openings per Fig-UG-42 (a). I mean it makes you to do some extra steps such as UG-42 (a) conditions 1 & 2 and supplemental rules, 1-7 (a) (c), But we can do it without increasing the...
  5. Vattappilly

    ASME SECTION VIII Div. 1

    UG-42. On a tank that is designed for 50 psi, I guess we can have 2 openings that are having overlapping reinforcements with out any consequences. I mean if the conditions (1) & (2) of UG-42 (a) are not met, supplemental rules given in 1-7 (a) and (c) are not that hard to meet. My point is...
  6. Vattappilly

    UW-9 (d) of ASME Section.VIII Div.1

    Thanks metengr for the reply to my last question about blue brittle range I do have a question about UW-9 (d) of ASME Section.VIII div.1 We typically separate the longitudinal seams on a shell with 2 courses by 90 degrees. As per the above paragraph we do not need to do that when we radiograph...
  7. Vattappilly

    Blue Brittle Range

    I ran into an Iron-Iron carbide diagram that talks about "Blue Brittle Range" (300-700F) They prohibit peening or working of steels within this range. Does this mean that I have to stay away from that range if I do any cold working on low carbon steel, Such as SA-36 or SA-106 Gr. B.

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