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I have had to design tanks with this type of slope on ethanol tanks. You have to make sure that the foundation is correct so that the shell and bottom are completely supported. The bottom of the bottom shell course has to be cut to conform to the slope and you have to make sure the field starts...

ITSdesign has just released their new version with shell nozzle calculations which includes nozzle replacement calculations and weld shear path failure calculations. It also checks weld spacing between nozzle welds and bottom weld, horizontal welds seams, and wind girders or vacuum rings. As...

Yes, there are errors in Appendix E of the 11th Edition. It will be corrected when Addendum 1 comes (still waiting to see the final proof copy) sometime "soon". API issued the wrong version of the appendix and decided to wait until Addendum 1 to correct it. In the meantime it has led to a lot of...

Addendum 1 (which should be released this month) addresses this situation. Appendix H tanks with circulation vents can be designed with Pe = 0. However, all other closed top tanks must be designed with a minimum Pe = 1 inch of water.

No, addendum 1 has not been released as yet. It was supposed to be back from the editors for final review almost a month ago but I have not received any notice saying it was back yet. I was hoping it would be released before inquiries had to be submitted for the upcoming API committee meetings...

You might also have to look at whether the tank will need anchoring. The dome roof manufacturer should be giving you some vertical uplift loads due to wind. This will increase the overturning moment which might then require anchorage.

It is my understanding from the API committee meetings that there are several errors in the 11th edition app. E. There is an addendum to the 11th edition originally scheduled to be released in October or November of 2007 but now scheduled to be released sometime in February 2008. I am waiting to...

If the values are correct it will increase the combination stress from seismic and liquid. I asked API this question along with several others on the seismic and was told that there are corrections to these coming in the Addendum 1 to be released in January.

In the 11th edition under 5.9.7.1 you calculate H1, the maximum distance between wind girders. Per paragraph d you have to calculate a divisor if your values specified for calculating the wind pressure are greater than what is shown in a-c. You are calculating one value of Kz for determining...

The 11th edition is 5.9.7.1 but the wording is essentially the same. Note d stills says the same thing and so my question still remains. Do you only use values that are higher than what was in paragraph a? So if the velocity is 115 mph do you use 120 or 115 mph? Likewise, Kz was used as 1.04. If...

In API-650 we can use ASCE 7 for determine the wind pressure. One of the factors is zg which uses a value of z. In ASCE 7-02 under "Other Structures" z was defined as the centroid of the area under consideration. In ASCE 7-05 it does not seem to say this. For a 40' high tank, should z be at the...

In 3.9.7.1 a. there is a formula for calculating the velocity pressure p to then be compared to 36 psf as noted in d. This is then to be used to determine H1. If the V is 115 mph, should the value of V used to calculate p be 115 or 120? In d it says that you do this when other factors are...

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