corrosion by caustic solutions

[Chumpes]

hi guys !
We follow PWHT / Ni-Alloy philosophy as per NACE SP0403 for control of caustic-SCC as a function of temperature, caustic concentration and absence of aggravating factors (vaporization...).

My question is more related to generalized aqueous corrosion of carbon steel by caustic solutions. Does anyone could provide reference for control of generalized aqueous corrosion of carbon steel in caustic service?
We are used to limit normal operating temperature below 65°C but i wonder about
- velocity limits,
- presence of oxygen,
- influence of pH around 14,
- influence of temperature,
- influence of chloride ions concentration.

Thanks a lot !

 

[EdStainless]

Materials Selector for Hazardous Chemicals, MS-6, Ammonia and Caustic Soda, pub by Materials Technology Institute of the Chemical Process Industry, 2004, ISBN: 1-57698-031-6

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P.E. Metallurgy, Plymouth Tube

 

[metengr]

http://www.mti-global.org/assets/do...-Egnlish/Bulletin 18 - non-member English.pdf

 

[bimr]

We are used to limit normal operating temperature below 65°C but i wonder about

You might want to check on that as Oxy recommends limiting the temperature in steel service to 38°C.

Caustic Storage and Handling

 

[Chumpes]

thank you, caustic people !