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I got my addendum from Techstreet. You could also try IHS Global Standards. I think both have it as a free downloadable PDF. I you have a two-sided printer/copier, you should be go to go!

I've ordered a copy, but have not yet receievd it. However, there was a 4th draft copy available on the API website. I downloaded it hoping that API may have fixed some of the problems found in API 650, Appendix E by way of updating Appendix L in API 620. I was disappointed to see that...

It's not defined anywhere that I could find and neither is the S term. In July of last year (2007), I emailed a technical inquiry to Gordon Robertson at API (see below). His only response was, "We had many errors in appendix e and are fixing them…here is the current version that is under...

I have a general concern with the new wind load and overturning criteria. The first equation given in section 3.11.2 can be rearranged to show that 0.9 Mw < MDL is acceptable (assuming there's no internal pressure). That looks to me like a factor of safety less than 1.0

There are also errors in Equations E-18 and E21. For Eq. E-18 the placement of parentheses includes the "-1" term as part of the argument of the cosh function. This is not consistent with other published sources (AWWA D100-05, Philip Myers' book "Aboveground Storage Tanks", and the original...

We are currently designing a tank using one of the Table 2-3 Group VI materials with a Sd of 32000 psi for the bottom two shell courses. Footnote 13 refers us to 3.7.4.6 which says that the material we are using "shall be represented by test specimens that have been subjected to the same heat...

One thing that I found helps with the uplift is 3.2.1.f.2 which puts an upper limit on the required uplift pressure of 1.6 times the maximum design pressure calculated using Appendix F. For large frangible roofs this reduces the uplift pressure considerably.