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Dear @IFRs and @HTURKAK, thank you both for answering my question. I'm kinda new in this industry and learn so much with you and this forum. Greetings

Hello, that's my doubt: Just a hypothetical scenario... If i have a small Diesel tank built according to API 650 (like 6m dia and 6m height),and a 500mm manhole on the shell, can I use the manhole to clean the tank? Do I really need a cleanout door to clean the tank or can i use the manhole...

Hi Geoff13, thanks for your answer. Thats exactly what i did, found 6.3mm for roof plate thickness. Many thanks for your answers :)

JStephen, I tried to use the worst joint eff possible, but still got low thicknesses comparated to the method descripted in 5.10.5. I guess you and Hturkak are both right. Really aprecciate your answer. I hope the best for both :)

Dear @Hturkak, thanks for your answer! Well, I'll use the formula given in 5.10.5.

Dear all, im designing a tank under api 650 annex F for academic purpose. the roof is cone type (self-supporting) with 9.5º slope Using the equation given in F.6.1 (written below) i got 0.046 mm t = (P x R)/((cos(alpha)*Sd*E) + CA t = (0.363*2.865)/(0.165*137*1) = 0.046 mm here is my data...

You need to see what standard the tanks were made. See API 620 and API 650 for advice

@Dhujarti Sen, thanks for your answer. I'm worried about this practice too. I'll have a meeting with my client and I'll alert him about this practice. If you have some good info about this, could you send to me?

@HTURKAK: Thanks for the answer! I will get this API RP right now :) @IFRs: Thanks for the answer too :) Will you limit the hole size you going to allow to be patched? My client didn't say anything about this,so , at this first moment, I'll recommend this type of repair for holes that do not...

@IRFs, I am studying an issue for my client, The issue: My client owns hundreds (literally) of API 650 vertical storage tanks at various fuel terminals nation-wide (not USA!). I need to make several step-by-step procedures (according to API) to standarize the maintenance of these tanks. They...

@IFRs, thank you for your answer. :) Do you know where I can find any normative recommendation for this type of repair?

Dear colleagues, Could someone tell me where can I find in API 650 or 653 about tank roof repair using cold work? (for example, BELZONA)

Geoff13, thanks for the aditional info!

@IFRs, this EXACTLY what I was looking for! Thanks a lot. Well, about the calculations, probably another company will do, but I think they will sketch the tank without door sheet in some finite element software and analyze, or just weld some beams on it without calculations. Anyway, when i get...

Dear HTURKAK, thanks again for the answer. Yes, all the tanks have self-supported cone roof and some of them have internal floating roof (gasoline tanks). As I didn't find anything in API 650 and 653 about shell temporary support calculation method, we'll do some calculations and proper...

Dear friends @IFRs and @HTURKAK thanks for the repplies! I apologize for the lack of info in this post, it's my first time in this forum. The tanks have single bottom. I need to make a step by step procedure (in compilance with API650 and API653) to install a double bottom in these tanks. It's...

Hi everyone, my problem is: There are several tanks and I need to standardize the double bottom installation process. It's my first time dealing with API650.I have to open some space in the shell. How I design the supports around the shell to avoid buckling? I have with me API650 and API653...