Mario,

Thanks for your feed back.

I'm sorry, I forgot to inform that the tank was designed
based on API 650 11th Ed., Add. 2 as Client requirement, not
the latest one.

In this edition there is no requirement for S1≥0.6;
the equation E.4.6.1-3

Ai≥0.5S1(I/Rwi) = 0.625SP (I/Rwi) is for Site Class E & F.

Regarding Rwi, I would like to inform
- At first I calculated using COADE Tank, and set
as un-unchored tank; Rwi=3.5.
- Since Client requested Anchor Bolt for the tank, then, I re-calculated,
and set as anchored tank.
Rwi = 4. I want to correct, the Ai=0.058594 (not 0.066964 as
my previous info).

Based on my calculation using COADE Tank, the software always
take the smaller Ai value (0.058594), even the equation E.4.6.1-1
will produce higher Ai value.

Pls Integraph team to advise (I utilized COADE Tank ver. 3.30.

Thank you & regards,
Amar F