Passivation of SS
Passivation of SS
(OP)
Is passivation and pickling mandatory for SS pipe lines. What are the common (easy to follow) practices followed in industry for passivation inside pipe lines.
Thanks
Thanks
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RE: Passivation of SS
We would order the pipe pipe pickled/passivated and weld the field joints with an inert gas purge or nitrogen purge or a fast freeze welding process without a purge. If absolutely required due to service we would use a pickle paste on the ID if we had to weld from one side only (depends on diameter and accessibility).
RE: Passivation of SS
I have found corrossion on SS lines near welding even in water service. Is this due to non passivation?
Regarding application, how is the paste applied for complicated spools.
Regards
Andy
RE: Passivation of SS
From a cost standpoint, I would not recommend pickle paste for complicated pipe spools; pickle and passivate the whole spool when corrosivity of the process fluid warrents.
RE: Passivation of SS
sensitization, as suggested by stanweld, could occur because of incorrect stainless selection. Can you check the exact stainless Type used where you found corrosion?
http://www.welding-advisers.com/
RE: Passivation of SS
Thanks
RE: Passivation of SS