Dear Hrishi From your querry it is understood that customer wants blasting and painting of external surface only and does not require internal pickling and passivation. Do not carry out pickling and passivation unless it is a customer specification requirement. Pickling and passivation can do harm unless thorough flushing is done which could be difficult in a closed vessel. Gopu
--- On Thu, 4/2/10, K.M Hrishikesan <hrishikm07@gmail.com> wrote:
From: K.M Hrishikesan <hrishikm07@gmail.com>
Subject: [MW:4204] packling&passivation after hydrotest is ideal?
To: materials-welding@googlegroups.com
Date: Thursday, 4 February, 2010, 10:14 AM
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 -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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