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  1. OscarAb

    ASME Section VIII, Division 1 Appendix 2 hub thickness calculation (g0) thread794-476789

    In response to thread794-476789. I have recently found a code interpretation regarding the use of the higher allowable stresses in calculating the hub thickness go on an ASME Section VIII, Division 1 Appendix 2 integral flange. The interpretation number is BPV-VIII-1-18-17.
  2. OscarAb

    Two Bolt Flanges

    I am working on an older (ASME Section VIII Division I, 1964 edition) shell and tube "hair-pin" type heat exchanger that has the following oddities. 1. Two-bolt process nozzles on the shell side and are cast into a fitting with only the following description, 2.5" IPS. - Does anyone have a code...
  3. OscarAb

    Solution Anneal vs Heat treatment U-Bends (UCS-56)

    In regards to post-forming heat treatment of SA-179 U-bends for a thickness of <= 0.134" via Soak time (15min) at temperature (1150°F)(ASME Section VIII, Division 1 UCS-56) vs Brought to temperature via electric resistance (no soak time) to temperature (1150°F) 1. Has anyone studied the...
  4. OscarAb

    Vapor belt (distribution cylinder) vs Jacket Vessel

    Innovation2, In Appendix 9, figure 9-5(b-3), dimension tc (nominal thickness of closure memeber) and trc (required thickness of closure memeber), in which the formula is found in Appendix 9 paragraph 9-5(c)(2). Do you considered the additional reinforcement required for the large opening in...
  5. OscarAb

    Vapor belt (distribution cylinder) vs Jacket Vessel

    I have been having a debate with a colleague, in regards to the design of a distribution cylinder (vapor belt) on a shell and tube heat exchanger. Several thoughts on this are: 1. Mandatory Appendix 9: Jacketed Vessels a. Historically, this is the method that has been used in the...
  6. OscarAb

    Hot Rolled Steel Bars AISI 1018 Fine Grain Special Quality

    Can AISI 1018 hot rolled steel bars be recertified to ASME SA-105-N or SA-350-LF2. If so can you please provide the reference code.
  7. OscarAb

    Short Radius Elbow vs Long Radius Elbow Allowable Stress'

    C2it, I do not have a copy of the 2010 edition of B31.3 but in the copy I have on my desk (2004) the reference to Note 5 says to see also Appendix A and the reference to MSS-SP-119 in ASME B31.3 (2004) is note 4. However note 3 in ASME B31.3 (2004) has the cautionary note which removes the...
  8. OscarAb

    Short Radius Elbow vs Long Radius Elbow Allowable Stress'

    I have found what I am looking for and indeed there was a reduction in allowable stress, I just could not remember the referenced code. The applicable code and paragraph was B31.3 table 326.1, Note 5 and B16.28 and ASME Section VIII, Division I. "The pressure-temperature ratings for ASME/ANSI...
  9. OscarAb

    Short Radius Elbow vs Long Radius Elbow Allowable Stress'

    I should have clarified myself, I am talking about ASME B16.9 butt welded fittings. For example: ASME B16.9 Short Radius Elbow = 1 x NPS Long Radius Elbow = 1.5 x NPS Lets take an 18"-SCH XH seamless long radius elbow, Material: SA-234-WP11 a Design Temperature of 400°F, ASME Section VIII...
  10. OscarAb

    Short Radius Elbow vs Long Radius Elbow Allowable Stress'

    I recall a number of years ago, when using short radius elbows for ASME Section VIII, Division I vessels there was a reduction to the allowable stress compared to that of a long radius elbow. Does anyone in the community remember what the reduction was and if so what was the document that...
  11. OscarAb

    UHX 13.4 Fixed Tubesheet Exchanger and Vacuum condition

    Thank-you for your comments Mike and I agree with all of them. I would only use a max delta T as a starting point to see if the design would be sufficient or would require additional work/material. Our local design survey requires an appropriate MMT at the vacuum conditions in order to...
  12. OscarAb

    UHX 13.4 Fixed Tubesheet Exchanger and Vacuum condition

    MIke, Thank-you for your insight and quick response. I agree with all of your comments, the reason for the question is that our local design survey office requires us to run the cases with the appropriate MMT in order to register the exchanger for a CRN and U-Stamp. I certainly agree that...
  13. OscarAb

    UHX 13.4 Fixed Tubesheet Exchanger and Vacuum condition

    ASME Section VIII, Division I, paragraph 13.4(a)(7), sub-paragraph 2. Indicates; "When vacuum exists, each loading case shall be considered with and without the vacuum." As the mean metal temperatures (Ts,m and Tt,m) have a significant effect on calculating the tubesheet thickness. The...

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