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Just wondering about whether or not to passivate a new kettle. I assume this is normally done in commercial breweries. I understand this can be done on the homebrew scale with Star San. Any other thoughts or suggestions?
Starsan does NOT passivate SS. Here is the link from our resource section...http://www.lowoxygenbrewing.com/wp-content/uploads/2018/08/ASTM-A967-Standard-specification-for-chemical-treatments-for-stainless-steel-parts.-1.pdf
Oxygen does the passivation. Nitric acid cleans the surface and supplies Oxygen. Citric acid? Anyone know. A clean surface of SS will passivate quickly when exposed to air.
Quote from: diver-bob on August 21, 2018, 02:54:21 amJust wondering about whether or not to passivate a new kettle. I assume this is normally done in commercial breweries. I understand this can be done on the homebrew scale with Star San. Any other thoughts or suggestions?Yes, it is always a good idea to passivate them when new or at least once per year (more frequently if you brew often). Give them a good cleaning with TSP or PBW then passivate them with Star San at the dilution rate of 1 oz. per gallon of water. I normally let the mixture sit in the kettle for about a half hour or so, wetting the sides frequently with a sponge if you don't want to completely fill the kettle (which can get a bit expensive). This was recommended by SS Brewtech when I purchased my conical and it works very well.
Quote from: hopfenundmalz on August 23, 2018, 06:08:25 amOxygen does the passivation. Nitric acid cleans the surface and supplies Oxygen. Citric acid? Anyone know. A clean surface of SS will passivate quickly when exposed to air.How long does it take when just using air?Sent from my iPad using Tapatalk Pro