DesignCalcs 2016.0 Release Notes (Release Candidate)

Owned by Mike Clark
Mar 05, 2018
4 min read

The lists below were for the 2016.0 Release (Release Candidate)

New Features

  1. The fixed and floating tubesheet math and output was updated to consider the Ptmin and Psmin changes in the 2015 edition of Section VIII, Division 1 part UHX.  Now the code defines Psmin and Ptmin for thermal cases as the vacuum pressure if vacuum is used.  Before it was just defined as 0 for thermal cases.  These changes only affect 2015 code year vessels.


Issues Resolved

  1. An issue was resolved with the 3D graphics that showed nozzles and their children in the wrong places at times.  This was a bug that only occurred in the 2015.1 and 2015.2 Beta releases.


Misc

  1. The Appendix A tube to tubesheet joint weld configurations changed their labeling in Appendix A in the 2015 code.  The labeling changed from a number to a letter.  No math was altered.  To accommodate this change, DesignCalcs shows both the letter and number in the drop down selection.  If the vessel code year is 2015, it will show a letter now in the output and will continue to show a number for older code years.



The lists below were for the 2015.2 Release (Beta)

New Features

  1. Nozzle reinforcement calculations now will take advantage of the seamless equivalent feature if applicable.  The 2015 Edition of the code introduced this in the UG-37 reinforcement calculations.  For 2015 and newer vessels, the nozzle neck material, host material, and the repad material will all determine if they need a seamless equivalent (this applies to welded product forms that have a build in 85% joint efficiency for their allowable stress).  If the material needs a seamless equivalent, DesignCalcs will attempt to find one based on a matching protocol - see Seamless Equivalent Criteria.  If a seamless equivalent is found, the reinforcement math will use the allowable stress from the seamless equivalent instead.  If a seamless equivalent could not be found, the allowable stress will instead be divided by 0.85.  This code change favors a more economical design.


Issues Resolved

  1. An issue was resolved with the value of Lnoro used in the calculation of A5 in the nozzle reinforcement math.  The shown value of Lnoro was correct; but the value used to get the result for A5 was not in certain cases.  The specific error was that the value of t used was based on the corroded nominal when pipe was used instead of the corroded minimum.  The corroded minimum is now correctly used.
  2. An issue was resolved with the New and Cold MAWP for nozzles in hosts using outside dimensions.  In this case, if an external corrosion was used, it was incorrectly applied to the host outside dimensions.  This correction will result in a higher New and Cold MAWP for cases affected.
  3. An issue was resolved with the New and Cold MAWP calculation for nozzles in pipe caps.  In this case, the hot stress was incorrectly used, instead of the cold stress.  The correction will result in a higher New and Cold MAWP for cases affected.
  4. An issue was resolved for the fr calculation for nozzles in pipe caps.  The issue occured in rare cases for trell and trcyl were rounded the the same value and then comparison of the two would set the Sv value in the fr equations to the higher of the two S values used to determine trell or trcyl.  The same comparison occurs; but now rounding the values for the comparison does not occur.  This issue is not likely to affect many designs and is more likely to affect lower pressure designs resulting in very low trell and trcyl values.  In addition, designs affected by this issue are more likely to see a more favorable design after the resolution.  





The lists below were for the 2015.1 Release (Beta)

New Features

  1. All of the Section II, Part D materials for the 2015 code year and approved for Section VIII, Division 1 construction have been added to DesignCalcs.
  2. The Seamless equivalent matching concept has been added to Pipe Cap. Now a welded product form will look for a seamless equivalent automatically.
  3. The matching criteria between customary and metric material lines and between yield, ultimate, and allowable stress lines have been improved. There are a few cases where matches were lost under the new criteria; however, many more matches were made.
  4. B16.5 2013 has been added for Rated Flanges for vessels with a 2015 BPV VIII code year selection.

Issues Resolved

  1. Metric Material Viewer had the 750 and 775 degrees Celsius temperature columns swapped for allowable stress. The correct allowable stress was with the correct temperature and no math was affected by this display only error.
  2. Fixed a small display error in the material viewer that made the 2011 page number label look odd.
  3. Corrected an issue in the clamp report displayed numerical substitution equation for Mg where the the value of Hd was being show instead of the value for Hg. The result was correct.

Misc

  1. The default code year is now 2015.
  2. Thin Walled Expansion Joints in a 2015 code year vessel will be designed per the 2013 code.  This is made clear on the first page the Thin Walled Expansion Joint report.  The reason for this is that the feature in DesignCalcs is rarely used.  This stance will be reconsidered if CEI receives user requests to include the 2015 code changes to Appendix 26.
  3. The reference in the shell report to Appendix 1-1(a)(1) has been simplified to Appendix 1-1 to be consistent with paragraph numbering changes in the 2015 code.  This affects shells designed using outside dimensions.
  4. The reference in the ellipsoidal and torispherical head reports, "The Appendix 1-4 Footnote Applies", has been changed to, "The Appendix 1-4 Strength Penalty Applies".  This has been done to make the note consistent paragraph number changes in the 2015 code and to make it more clear what is going on with the allowable stress used in the design formulas.