Caustic Solutions - MOC

One of the most frequent questions I’ve been asked over the years is, what material of construction should I use for pipe and fittings for a caustic (NaOH) solution?

I usually refer to this chart we have in our pipe spec for caustic:

The chart has three zones. Find which zone your caustic solution’s maximum temperature and NaOH concentration are in. Use that zone’s, or higher, material of construction.

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