Reconstructed tanks (chap11 / I -#10)

Question 1

What is definition of reconstructed?

Answer 1

Any work necessary to reassemble a tank that has been dismantled and relocated to a new site.
Tank that has been dismantled and its pieces used together to make a new tank.

Question 2

For design condition-Where to located the max. allowable stress? and what if it is not located in table?

Answer 2

API 650 table 5.2 (for new+reconstructed), if not , than an allowable stress of value lesser of 2/3 Y or 2/5 of T.

Question 3

For hydro test condition-Where to located the max. allowable stress? and what if it is not located in table?

Answer 3

API 650 table 5.2 (for new+reconstructed)), if not , than an allowable stress of value lesser of 3/4 Y or 3/7 of T.

Question 4

Formula to calculate mini thickness of shell of a reconstructed tank?

Answer 4

td=2.6(H-1)DG/SE +CA (no CA for tt)
t=inches
D=ft
H=design liquid level

t=hydrostatic test
d= design condition
E=1 in new tanks (is deseamed if not follow table 4.2)

Question 5

Difference between Sd and St for new and reconstructed tanks vs existing tanks?

Answer 5

Sd and St for new/reconstructed tanks are LOWER than existing thanks.

Why? B/C they have not proven themselves in hydrostatic test/operational conditions.

Question 6

Sd/St are the same for all shell courses?

Answer 6

Yes