Suitable material for Alkali service

[Steph100]

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!

 

[JLSeagull]

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.

 

[JimCasey]

There are many compatibility charts accessible in the web.

Here are a couple.

http://www.flowserve.com/vgnfiles/Files/Literature/FCD/dvatb0005.pdf

http://www.upchurch.com/TechInfo/chemComp.asp

Look at Monel for Caustic.

 

[kenvlach]

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[1].pdf