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pipe material compatibility with distilled water

pipe material compatibility with distilled water

pipe material compatibility with distilled water

(OP)
Is distilled water as corrosive to stainlees steel (316L) as DI water? is copper or aluminum compatible with distilled water?

RE: pipe material compatibility with distilled water

Distilled water may be slightly more corrosive, since it may contain more Cl- than DI.  Per ASTM D1193, DI can produce 18 Meg-ohm water (Type I Reagent Water) with max 1 ppb Cl-, while (single) distillation (Type II) can produce 1 Meg-ohm water with max Cl-.
All high purity water should be protected from air to avoid CO2 absorption.
316L > Al >> Cu for piping.  The 316L & Al form more stable passive surface oxide films, while Cu dissolves excessively.

RE: pipe material compatibility with distilled water

commonly 316L is used for water service ranging from municiple potable all the way to UHP.  I only get concerned when the water is hot.

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