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...
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...
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...
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...
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...
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...
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...
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?
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.
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
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...
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...
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...
