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  1. JohnBreen

    Branch Connection Stress Analysis

    It is difficult to understand exactly what information you are requesting from the group. You seem to be considering the structural integrity of a single component that will be a part of a piping system. To be able to determine the myriad loadings that will be applied to the individual...
  2. JohnBreen

    Pipe thickness Calculation using ASME B31.3

    You really need to include additional wall thickness for corrosion (internal and external)over the expected life and certain dynamic wave effects e.g. water hammer and (in some cases) bubble collapse. Develop and review a list of these possible internal and external dynamic effects. Also...
  3. JohnBreen

    Compressible fluid volume for blast wave consideration in piping failures

    There was some work done to consider such “Dynamic Effects” prior to 1970. This work was described in 13 references reported in an Atomic Energy Commission document titled “Survey Report on Structural Design of Piping Systems” (TID-25553) as authored by E.C. Rodabaugh and A.G. Pickett). Note...
  4. JohnBreen

    What is the determining factor on whether or not an expansion joint is needed

    As you describe it, your system will be installed at “ambient temperature” and the rise in stress will be caused by the reduction in temperature as the pipe material CONTRACTS when the system is placed into service. In concurrence with most of what has been said above (thanks pennpiper) the...
  5. JohnBreen

    Dynamic Load Factor for Water Hammer

    Here are some"good reads" http://www.accutech2000.com.au/AFT/AFT%20Brochures/AFT-Evaluating-Pipe-Dynamic-Loads-Caused-by-Waterhammer.pdf https://rules.dnvgl.com/docs/pdf/DNV/codes/docs/2008-10/RP-D101.pdf...
  6. JohnBreen

    ASME B31.3 flexibility analysis criteria

    Thanks for the kind words fellow "pipers". My Beautiful Bride has "explained to me" that I am now retired!!!??? So, I guess that means no more hopping around the world - most of my travel will now be attending B31 Code Committee meetings and spending as much time in PA and Texas as MBB allows...
  7. JohnBreen

    ASME B31.3 flexibility analysis criteria

    319.4.1 Formal Analysis Not Required. No formal analysis of adequate flexibility is required for a piping system which: (a) duplicates, or replaces without significant change a system operating with a successful service record. THAT is easy to understand: “NO SIGNIFICANT changes” - what...
  8. JohnBreen

    Modulus of Elasticity Adjustment for Temperature

    http://www.academypublisher.com/ijrte/vol01/no06/ijrte0106046049.pdf
  9. JohnBreen

    Crotch Plate Design Guidelines

    It is difficult to understand what it is you need. What are you designing? Is it a branch connection? I do not understand "crotch plate". Can you expand on the information you are providing?
  10. JohnBreen

    Modulus of Elasticity Adjustment for Temperature

    You can't use a factor to adjust the modulus of elasticity for all materials as it is not linear. Go to B31.X and look at Appendix C for the various materials. Make a temperature dependent table for each material and incorporate that in your spreadsheet.
  11. JohnBreen

    Pipe Stress Engineering

    I think the original PipePlus (before it was renamed with that tag) was written by Mike Chin from Houston. ALGOR is now owned by Autodesk and I believe they are offering a limited time free download of the most recent manifestation of the piping software. Its a long story. John
  12. JohnBreen

    B31.1 cyclic condition question

    ApC2Kp Please excuse a little "nit picking" here. "The B31 allowable stesses for the materials in Table A-1 thru A-7 have been established for 7,000 cyclces" Well, No. The Allowable stress at temperature, as found in the cited Appendices, are based up 1/3 yield or 2/3 ultimate strength...
  13. JohnBreen

    Tresca, Von Mises and Luder bands

    Yet another gold star for BigInch! The ASME B31 Committee chose the Tresca criteria simply because it is the easiest to calculate - no technical issue involved. The ASME B31 Codes strive to present a simplified methodology for design and analysis of piping systems. Glad to see that you are...
  14. JohnBreen

    The "piping Guide" is back.

    Hello All, Over the years we olde piping guys have been asked on this forum to list the books that we believe "every piping engineer" should have on their bookshelf (our past discussions can be found by using the "search facility" up in the top of this page). Too many times we have had to...
  15. JohnBreen

    Solving the Colebrook-White equation in Excel without Solver/VB/macro

    We need more of this sort of sharing.
  16. JohnBreen

    Are residential hydronic boilers required to be ASME H stamped ?

    It depends upon the jurisdiction. Contact info here: http://www.nationalboard.org/ViewOurMembers.aspx
  17. JohnBreen

    high pressure piping and Bourdon effect

    SNORGY Do you happen to know if L.C. Peng's book is available in Canada? Hey, if you order it on "Canada Day" how could ASME possibly turn you down. You Canucks better not try asking them to pay the shipping just because of "Canada Day" though - bunch of tight hosers eh? John.
  18. JohnBreen

    high pressure piping and Bourdon effect

    Bourdon effect is usually less than most analysts imagine. Very large diameter pipe bends with relatively thin wall thickness may see some additional strain due to internal pressure, but internal pressure in pipe necessarily leads to thicker walls in pipe, bends and elbows. L.C. Peng discusses...
  19. JohnBreen

    Pipe Stress Engineering

    SOROURA, "Pipe Stress Engineering" is for everybody who aspires to be a knowledgeable piping engineer. For the "beginner", the first read through the book will take more time but the Pengs do include basic concepts so it will not "lose you". But even after you have a few years "under your...
  20. JohnBreen

    Pipe Stress Engineering

    Hi Leonard I was not aware Glynn and Tony were working on a book. I will ask them about it and get back to you. Regards, John.

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