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  1. YuJie_PV

    ratcheting: The loading results in only primary stresses without any cyclic secondary stress

    hi all experts, i am reading part 5 of ASME VIII-2, and find such sentence in paragraph 5.5.1.6: Protection against ratcheting is satisfied if one of the following three conditions is met: (a) The loading results in only primary stresses without any cyclic secondary stresses. ... i've thought...
  2. YuJie_PV

    some questions regarding the buckling analysis(5.4 of ASME VIII-2)

    hi all experts, i am looking at para.5.4 of 2023 asme VIII-2, and have some questions regarding the buckling analysis, please shed me some light: 1. "if the applied loading results in a compressive stress field within the component, buckling may occur, and an evaluation in accordance with 5.4...
  3. YuJie_PV

    1/2 loading for 1/2 model in ansys?

    hi experts, I'm working on a finite element analysis (FEA) of a pressure vessel, and I’m using a 1/2 model for the vessel and the nozzle. In this setup, should the forces and moments applied to the nozzle be considered as half of the complete loading, assuming the loading is symmetric? Any...
  4. YuJie_PV

    Membrane or Membrane+Bending when assessing local failure protection per ASME VIII-2

    hi All, i have a question regarding local failure criteria in the example of ASME PTB-3, shown as below: "5.3.2 Example E5.3.2 – Elastic Analysis In addition to demonstrating protection against plastic collapse, the following elastic analysis criterion shall be satisfied for each point in the...
  5. YuJie_PV

    does ASME provide design-only certification of VIII-1 to a company?

    hi all, the salesman of my company checks with me if design-only certification is available under ASME VIIII-1. many years ago, i accidentally heard that ASME would provide design-only certification to a company? what is the current status? is design-only certification for ASME VIII-1 available...
  6. YuJie_PV

    under what situation, the creep analysis is mandatory?

    hi, all, a pressure vessel is designed to ASME BPVC VIII-1 or VIII-2, under what situation shall the creep analysis be mandatory? At temperatures in the range where creep and stress rupture strength govern the allowable stress? if yes, i am confused why creep analysis is required while...
  7. YuJie_PV

    An ASME interpretation regarding UW-11(a)(5)(-b)

    i am reading Interpretation "BPV VIII-1-19-11", and encounter a problem: Background: A vessel has a 14" NPS nozzle which is 15mm (0.59") thick with a Category C butt weld between the nozzle neck and a flange. The nominal thickness at the welded joint does not exceed the thickness in UW-11(a)(2)...
  8. YuJie_PV

    the reason of the change with UW-11(a)(4)?

    i accidentally find one change of UW-11(a)(4) in ASME VIII-1 since 2019 edition. UW-11(a)(4) of 2017 edition: (4) all butt welds in nozzles, communicating chambers, etc., with the nominal thickness at the welded joint that exceeds the thickness in (2) above or attached to the shell or heads of...
  9. YuJie_PV

    MOC for a tower with MDMT -70C ?

    hi, all i've a question regarding MOC of a tower, which is constructed to ASME VIII-1 it's a deethanization tower with diamter of 2.5m, and height of about 50m，Design pressure 4.6MPa, Design Temp 150C， MDMT-70C. i would like to fabricate the tower with a low alloy material. i don't like to use...
  10. YuJie_PV

    is such practice for fatigue analysis normal?

    hi all, i come across an issue regarding how to exempt the fatigue analysis for the air cannons. the situation is such that i am working with an equipment to which several air cannons are attached. the cannons are used to prevent accumulation of powder in the filter. the air cannons are just...
  11. YuJie_PV

    is RT/UT available to angle joint?

    Hi all, it's regarding NDE of angle joint defined in ASME VIII-1. angle joint is indicated as NA in table UW-12 regarding NDE, but i checked with engineer experienced in NDE, and find RT， and UT could be performed for angle joint in case that the diameter is large enough. i am confused now...
  12. YuJie_PV

    hot dip galvanized bolts forbidden on Stainless Steel vessel?

    Hi all experts, we are implementing a project which locate alongside the sea. that means corrosion is serious. recently, our corrosion engineer raise additional statement that "hot dip galvanized bolts are forbidden on Stainless Steel vessel", even the operating temperature is ambient. the...
  13. YuJie_PV

    Is there a paradox between UCS-68(b) and UCS-68(c)?

    hi, all i encounter an issue when reading UCS-68. UCS-68(c) states that "The resulting exemption temperature may be colder than −55°F (−48°C) when the PWHT exemption in (b) is applicable.". what does that mean? i have an example offering where the issue lies: a vessel constructed of SA-516 70N...
  14. YuJie_PV

    UCS-67_the coincident ratio exemption does not apply to weld metal?

    hi, all experts, it's about UCS-67 in ASME VIII-1. i read "CASTI Guidebook to ASME VIII-1", and find the following statement: "When the minimum design temperature is less than -55°F (-48°C) and the parent materials are exempt from testing because of a low coincident ratio, the weld is still to...
  15. YuJie_PV

    governing thickness of forged neck welded to shell per UCS-66

    hi all, i am reviewing a calculation of the MDMT of the forged neck. it's about how to determine the governing thickness. it's a forged nozzle constructed of SA-105 produced to fine grain practice and normalized heat treatment. it's butt welded to the shell constructed of SA-516 70N, which is...
  16. YuJie_PV

    may SA-36 be used to MDMT -50C as tie rods?

    hi all, i've a question regarding to UCS-66 in ASME VIII-1: it's a heat exchanger constructed to ASME VIII-1 with MDMT -50C. may i use SA-36 for the tie rods in tube bundle? per my experience, SA-36 is not suitable for such cold temperature, but i find the following paragraph: UCS-(b)(3) When...
  17. YuJie_PV

    ASME VIII-1 Figure UCS-66.3 (b)and curve selection

    hi,all, i encounter a problem regarding to determination of MDMT per UCS-66. it's nozzle welded into shell. the nozzle and shell are evaluated based on their governing thickness, and UCS-66 curve respectively. i am clear with it, just how to deal with the tg1,tg2,tg3 in figure UCS-66.3(b)...
  18. YuJie_PV

    is it allowed to avoid fatigue analysis by raising design pressure?

    hi, all, my colleague come to me with a question, that he have a tubular exchanger with the channel side subjected with cyclic loading. the operating pressure ranges from 0 to 0.3MPa, and the design pressure is set at 0.6MPa。the operating temperature is not high, around 170C。 according to the...
  19. YuJie_PV

    is such simplification method on fatigue evaluation acceptable?

    hi experts, ​i am checking a FEA REPORT of a buffer tank designed to asme viiii-1. in the meantime, the buffer tank is subjected to cyclic loading, thus VIII-2 part 5 is referred to evaluate the risk of fatigue failure. and now i have following inquiries: 1, is it mandatory to check other...
  20. YuJie_PV

    thermal stress due to temperature change?

    Hi all, it's known that thermal stresses are stresses that result when a temperature change of the material. there is a general practice in this industry that people just consider the thermal stress resulting from thermal gradient. we never consider thermal stress due to material elevated to...

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