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Thanks HTURKAK, I had a close look at the worked example is Annex V. I have external pressure due to wind, internal pressure is only 0.25Kpa Noted in the worked example, minimum shell thickness were increased to eliminate the intermediate WG and the tank is further strengthened to withstand...

Thanks Geoff, It makes sense. Tank will be constructed in Fiji island and it is a cyclone area and the customer wants to design it to Category 5 cyclone. When I further worked on the shell stability using Annex V for external pressure (for both wind & external pressure) I have used the below...

V = 80m/s I have used 5.9.7.6 to calculate the minimum required section modulus for the intermediate wind girder. I have positioned the intermediate wind girder as per 5.9.7.3.1 and hence h2 is different in both cases

Thanks Hturkak, when I calculate all these and finally calculate the section modulus of the intermediate girder required I am really confused as I need a bigger section of intermediate wind girder if I take 8mm as the thinnest shell thickness in comparison to 6mm thinner shell thickness. I have...

Dear Experts, I am in the process of designing 15m diameter x 15m high tank. Calculated thickness for the top course is 2.7mm & the minimum requirement as per API650 is 6mm. However the construction team requested it to be 8mm so I have considered 8mm thick top course. Now the question is when...

Thanks Experts. Here are some more detail of the tank. 1. Tank diameter is 27m and height is 16m 2. Plate thickness at the lower course is 16mm and at the top course is 8mm and it got an intermediate wind girder at 7m from the top 3. Method of Construction - Jacking 4. Material grade is A36...

Dear Experts. Our client is asking for tolerances more than what is defined by API650. Much appreciated if you could advise if any one come across this and can this be achieved? 1. The maximum out-of-roundness measured 300mm above the floor to shell weld shall not exceed +/-19mm. [highlight...

Thanks a lot for your time

Dear Experts Is it acceptable to use internal stiffeners in API650 Storage Tanks?

Dear Experts, I have attached a measurement taken, by dropping a plump-bob from top of the tank, on top and bottom of the individual strake to check the plumpness of individual courses. Top course is 1800mm heigh and the rest is 2400mm heigh and of 8mm thick. Tensile Strength of the plates are...

Thanks JStephen, Referring the API650 on the plumbness, tolerance given in 1/200 of the total height. So if I am doing the top to bottom construction and to check the plumbness at any time during construction is it measured 1/200 of the height of the tank constructed? or is it something else...

Dear Experts. We are constructing a 28.4 mtr dia x 17.7mtr hight CS Fixed roof storage tank. Construction is done using Jacking method oe top to bottom construction. I would like to seek your advise on the Roundness Tolerance. As per API 650 for the size of this tank roundness tolerance is +/-...