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Suitable material for Alkali service

Suitable material for Alkali service

Suitable material for Alkali service

(OP)
Customer has no idea which material to use, product is triple offset butterfly valve - example of alkali service was given as caustic soda (ph 13).
Looking through PMAs only an Cy40 material mentions alkali service so need some guidance please!

Thank You!

RE: Suitable material for Alkali service

Check to see if the caustic soda is a mixture of NaOH or sodium hydroxide and water.  Whatever the answer, google the fluid such as NaOH, water & material.

RE: Suitable material for Alkali service

Are you sure that the pH is only 13? This corresponds to a 0.4 wt% NaOH solution.  A pH of 14 corresponds to 7.4 wt% NaOH, and 50% NaOH is the usual solution as commercially shipped. For practically everything you need to know about caustic soda, including storage & handling, see the
OxyChem Caustic Soda Handbook http://www.oxy.com/oxychem/Products/caustic_soda/literature/caustic%5B1%5D.pdf

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