How many thickness of thin wall of atmospheric storage tank? 2

[Ekmann]

Dear All,

As per project specification, which specify detail as below.
"Due to the thin wall of atmospheric storage tank"
from my experiment thin wall shall be less than 6 mm.
or r/t >=10
I trying find/search paper prove this but can't found.

So, if who have any document or standard please let me know.

Thank,

 

[LCeballos]

Ekmann,

Go to API-650 Std. Paragraph 5.6.1.1

 

[JStephen]

I interpret the question to mean "What is the definition of 'thin wall'?"

In Roark's Formulas for Stress and Strain, he gives equations for hoop stress in a thick-walled cylinder. Evaluating those equations, you can get an approximate limit where stresses are the same as a thin wall.

 

[Ekmann]

LCeballos,
JStephen,

Many Thanks for your answer.