I have been debating about what to do with the material requirements for an Appendix J tank. What is specified in J.2 is that the material must meet the requirements of Section 4. This would mean that if you use A36 material in a shop built tank with a design metal temperature of -10 degrees F, you would have to impact test the material. What is strange to me is that if I built that same tank to Appendix A the material does not have to be impact tested per A.2. I plan on presenting the question to the API committee at the next meeting. In the meantime, I have added a checkbox to the design page of our software where you can select to use the material limitations of Appendix A. Each user will have to determine whether their customer will allow them to use the material as specified in Appendix A instead of the requirements of Section 4.
We have made some additional modifications and corrections to ITSdesign. Be sure to read the revision notes to see what we have done.