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Thanks IFRs, I thought so. I just got a bit confuse about the "most",English isn´t my native language. Thank you guys for such a good topic.

Hi everybody, Nice topic to read this one. I was reading the API650 and I would say that all the annex S tanks would be annex M tanks also. Can you please give me an example of an annex S tank which wouldn´t be a annex M?? Thanks.

Thanks for the answers. By the design of the tank it isn´t possible to have frangible joint, either cann´t use free vent. Yes it is a 1/4" thick roof plate. I have just check and the lowest roof vent activation is 1.73 inWC.

Hi, I am sizing the Emergency Pressure Relieve Valve for an API 650 Tank. It does not have internal pressure so the MAWP is limited to the basic calc of roof weight/cross sectional area of the tank which results in MAWP=1.96 inWC. I have already sized the set for the PVRV in 1 inWC. When I...

IFRs thanks for your answer. Anyway I correct a mistake in my post: My question arises when the result for the Aa is negative. What does it mean?

Hi everybody, When I am determining the frangible roof area (A), I use the formula in 5.10.2.6. Checking the roof to top angle compression ring. It is limited to details a-e in fig. F-2. Based on these details, I can determine the participating area for the shell (As) and the participating...

Thanks Fegenbush, So, if the tank does not have frangible joint. Can I specify any permissible detail of compression ring in figure F-2? Thanks

Hi everybody My question is the next one: Is it true that frangible joint is only use for tanks in which internal pressure doesn´t exceed the weigth of the roof? I am asking because I am about to design a tank with working pressure= 8 in H2O. About this pressure, what should be the design...

Hi everybody, I am just working on the appendix G and I got a doubt, what is the criteria for frame members dimensions design? Thanks,

Continue with the last post, I have found different kind of cases for the Reinforcement Calculations for Internal Pressure. Which are as follows: The attached ASME B16.5 flange limits the nozzle MAWP. Available reinforcement per UG-37 governs the MAWP of this nozzle. The vessel wall thickness...

Dear all, In the compress report specifically in pressure summary. The MAWP for the nozzles depends of what? I am asking because I think the MAWP should be given by the ASME B16.5 and I am doing a vessel in which the report indicates a MAWP lower than given for ASME B16.5 at the indicated...