"passivation of 316L welds"
"At present our fabricators do not passivate any of the 316L stainless steel welds, but only grind the top surface back to a smooth finish. Is this acceptable? The media in contact with these welds in future would consist mainly of 'towns' water at up to 80C."
For your specified service, grinding welds flush without a passivation treatment is most probably acceptable.
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