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  • Users: nachocivicos
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  1. nachocivicos

    Self-energizing O rings

    Thank you very much for your help! After reviewing calculations, I am not sure of which "h" value to use regarding sketch (7); I have noticed final thickness strongly depends on this parameter, which was previously advised to me to be taken as equal to weld leg. But after this advice I am...
  2. nachocivicos

    Self-energizing O rings

    Hi, In case of Self-energizing O-rings, strante behaviour appears when comparing integral and loose type flanges (ASME VIII, Div.1, Mandatory App. 2), calculated thickness for loose-type (sketch 4a) appear to be lower than for integral-type (sketch 7). How is it possible? I believed thickness...
  3. nachocivicos

    INTEGRAL VS. LOOSE FLANGES CALCULATION

    gr2vessels, Thank you for your analysis; It helped me see it a bit more clear. But my last question still remains: for example for sketch 7, which value should I take for parameter h in calculations? It does not seem to correspond to any weld dimensions... Thank you very much again, J.I.G.C...
  4. nachocivicos

    INTEGRAL VS. LOOSE FLANGES CALCULATION

    Hi, Regarding flange calculations according to ASME Section VIII Div. 1 Mandatory Appendix 2, the paragraph 2-7 seems quite obscure to me; loose or integral-type formulas appear to be "interchangeable" to some degree provided a hub "is considered" or not (?). I would appreciate very much some...
  5. nachocivicos

    Variable section opening

    doct9960, Thank you for your fast reply, and sorry for the missing information above, where I did not tell I have multiple openings. My problem arises not from size requirements, but from spacing requirements in UG-36 (c) (3)(d), where the mentioned opening with say d1 = 1 1/2" is nearer than...
  6. nachocivicos

    CROSSED LINK BETWEEN UG-36 AND UG-39?

    Hi, In case of openings in flat heads, I am not fully sure of the logic linking UG-36 and UG-39 in ASME VIII Div. 1. As a first "general" appearance in the "OPENINGS AND REINFORCEMENTS" subject, one could think that openings meeting UG-36 requirements do not need to be further checked for...
  7. nachocivicos

    Variable section opening

    Hi, I have to design a variable section opening in a flat head; it begins with 32 mm diameter inwards, follows with a conical enlargement and ends with a BSP female thread 1 1/2", but I have not found any reference in ASME Sec. VIII Div. 1 to variable section openings. Any other similar...

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