Ok thank you guys !
Last thing, because there are several differents answers with my ask so i change my way to ask :
How to calculate the frangibility for an anchored tank ?
I dont find the chapter in API 650...
Thanks again !
Ok.. Thank you JStephen
I'll try to explain easier, i had a tank no-anchored with emergency vent on the roof to make the frangibility available, calculated with API 650 and API 620.
Now, my tank is anchored with 1'' but my nozzles to guarantee frangibility of roof aren't correct, i have some...