well, a couple of brazetek heat exchangers in the brewery were looped into a passivation cycle using a strong acid#5 solution. the tanks and all the stainless were left to dry and they're fine, mission accomplished there.
unfortunately the hx's were not rinsed and some blue/green stuff (oxidized copper, looks like) and rusty colored material formed in the bottom outlets, where a bit of solution puddled and stayed. quite a bit of rusty/red powder came out when flushed. manufacturer instructions for these kind of hx's usually tell you to limit sanitizer/acid contact time. bummed that these instructions were not heeded.
question is: can these hx's be revived, or are they probably shot? obviously a visual inspection is limited to what a flashlight can see in the four openings, these suckers can't be opened up.
i ran an normal acid cleaning cycle for kicks, and some rusty powder came out in the cip solution. what the insides look like is god's own mystery.
anyone have any experience with this kind of thing? (btw, i hope this serves to inform others with these types of hx's to not leave strong acid hanging out too long)
any help is greatly appreciated. hopefully i won't have to replace them. thanks all...
unfortunately the hx's were not rinsed and some blue/green stuff (oxidized copper, looks like) and rusty colored material formed in the bottom outlets, where a bit of solution puddled and stayed. quite a bit of rusty/red powder came out when flushed. manufacturer instructions for these kind of hx's usually tell you to limit sanitizer/acid contact time. bummed that these instructions were not heeded.
question is: can these hx's be revived, or are they probably shot? obviously a visual inspection is limited to what a flashlight can see in the four openings, these suckers can't be opened up.
i ran an normal acid cleaning cycle for kicks, and some rusty powder came out in the cip solution. what the insides look like is god's own mystery.
anyone have any experience with this kind of thing? (btw, i hope this serves to inform others with these types of hx's to not leave strong acid hanging out too long)
any help is greatly appreciated. hopefully i won't have to replace them. thanks all...
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