storage tank design

[aani1984]

Tanks
now i got.

AAni

[inam]

hi every one its my first time......
my question is whats the criteria for selecting the curb angle/top angle?
for example my tank is 13m, so the minimum requirement for curb angle will be 2*2*1/4.so my question is should i straight away select this one or can go for 3*3*1/4 given that this new angle maintains the tank frangibilty

help!!!!

[Ali366]

hi every one its my first time......
my question is whats the criteria for selecting the curb angle/top angle?
for example my tank is 13m, so the minimum requirement for curb angle will be 2*2*1/4.so my question is should i straight away select this one or can go for 3*3*1/4 given that this new angle maintains the tank frangibilty

help!!!!

I'm not quite following what your question is. Looks like the answer is in your question. 2x2x1/4 is the minimum required size. You can go with any larger sizes if you need.

As addressed in API 650 Clause 5.1.5.9 (e) the designer may use other sizes if he/she designs the tanks with frangible roofs, tanks with self supporting roofs, tanks to appendix F, etc.

But note that if the roof is to be frangible, it is not desirable to go with larger and stronger top angle. See 5.10.2.6 items a.5, b.2, c.1.

Cheers,