[MW:4204] packling&passivation after hydrotest is ideal?

Friends

 

I have a vessel with MOC SA 387 11 cl-1class11 with  410S cladding(Coke drum). The vessel is to undergo PWHT and external blasting and painting.

Please suggest if I go for pickling&passivation after hydrotest that will be more appropriate? In my earlier projects I have done picking&passivation before hydrotest.

What is the best practise? Please advise.

 

Regards

Hrishi

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