pipe material compatibility with distilled water

[Diabolico]

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

 

[kenvlach]

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.

 

[EdStainless]

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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