Maximum Allowable Internal Pressure

[blawn]

Dear All,

In the evaluation of an existing tank for max.allowable internal pressure,there's a formula used by other people
which is:
t yn=thickness of the tank component under consideration at the next inspection at twice the calculated corrosion rate,which is
t act-(2*Cr*Yn)
I just want to know where this concept came from just as I cant find it in the Inspection code,API 653.Or does this formula based
from other inspection code?
Appreciate any reply.
Thanks.

 

[Duwe6]

Basic API inspection premise -- gotta reinspect on or before the Half-Life. So that calc will give you a reinspect date of halfway to the End-of-Useful-Life [at the MAWP that you chose].

 

[blawn]

Dear Duwe6,

Thanks for the feedback.So if it is a Basic inspection premise,it could probably written in a publication or in a reference standards.
Actually there are clients who really dig so deep on my inspection report so I really want to make sure anything presented
on papers is referenced to a standard.I really want to include Maximum Allowable Internal Pressure evaluation on my report but I cant since client will surely ask me where the formula came from.
regards