API 579 time used for FCA

[fedefer85]

Hello everyone.
I have a pressure vessel with an acceptable LTA and remaining life >10 years. It will be inspected in 5 years from now. I used 5 years to calculate the FCA. Should I use 10 years?

FCA definition says that is: "the corrosion allowance required for the future operational period of a component".

Thanks a lot.
Regards.

 

[r6155]

Do not confuse Future Corrosion Allowance (FCA) with "original specified corrosion allowance".
Reread API 579 and use your engineering judgment.
API 579 is clear and easy to understand.

Regards

 

[fedefer85]

I didn't confuse FCA with CA, is the definition provided in API 579. And I've read the code and decided to use 5 years for FCA. I just asked if anyone would use 10 years instead of 5.
Thanks

 

[r6155]

API 579 do not establish inspection intervals. You decide. Several countries establish them.

Regards

 

[fedefer85]

You are confusing everything, read my thread and my reply again: I didn't ask for the frequency of inspection. I'm asking for the time used for the FCA.

Thanks anyway.

 

[TGS4]

I would have specified something a little beyond the 5 years to your next inspection interval (because inspection intervals often don't work out that cleanly). I probably would have run a series of times to calculate FCA, in order to determine the time-to-failure.

 

[r6155]

@ fedefer85
If the remaining life >10 years why it will be inspected in 5 years from now? Your engineering judgement is not clear.

If you have already decided on a 5 years interval, if you have read and understood API 579, why are you asking a question for a 10 years interval?
Not sure now?

You can inspect every year if you want. In this case you will be fired at my company.

Am I the one who confuses everything?

I take my time to help you.

Regards

 

[fedefer85]

OMG... It will be inspected in 5 years, without a doubt. WHAT I AM ASKING IF THE FCA IS BETTER TO BE CALCULATED 2*INTERVAL OR NOT! It's simple as that the question. And I wouldn't work with you, thanks anyway.
Avoid further replying.
Good luck