Allowable Stress Rounding Rules Changed in 2007

Did you know that the rounding rules for allowable stresses in ASME Section II-D changed in 2007?

If you are anything like me you have to run a lot of calculations on older equipment. Making sure I use the correct allowable stress is not always a straightforward task. One ASME Code change I have to remember is to the rounding rules in the 2007 version of ASME Section II-D. 

In this example using the latest allowable stress rounding rules results in an unconservative required thickness because the original design was calculated using a lower allowable stress. Please do not accidentally give yourself credit for the newer allowable stress rounding rules when re-calculating older equipment.