Material Selection for Caustic Soda 1

[kootheBUNNY]

Hi! ) May I ask what is the suitable material for a pump impeller having a medium of caustic soda with a temperature of around 29-38C? And if you guys could suggest a reference book about material selection for certain chemicals, i would greatly appreciate it. Thank you!

 

[shvet]

Q1: API 610 ann. G
Q2:

https://www.eng-tips.com/viewthread.cfm?qid=498076

 

[pierreick]

Hi,
Consider this handbook from Dow chemicals.
Pierre

 

[MJCronin]

Ummmmmmm....."a medium of caustic soda" is vague, IMHO ... What is your percent caustic ....?????

The DOW handbook for Caustic Soda has been around for decades and is certainly the go-to in this subject matter.

While several materials are acceptable for use, how long do you want your pump impeller to last ?

Alloy 20 (and other premium materials) are usually worth the extra cost .... If you want to extend maintenace intervals

https://www.xylenepower.com/nickelpub10019_causticsoda_20pg.pdf

But, a few questions present themselves:

1) What kind of caustic pump are you using ?.... Which vendor ?... Conventional or seal-less ?
2) Are you allowing for additional Caustic NPSH margin with your pump selection ?
3) What kind/type of mechanical seal are you using ? ... how did you make your selection ?
4) Are you considering how you will flush the pump internals with clean water casing when the pump is shutdown ?

These might help ....... GOOD LUCK SIR !!!! .............KEEP US POSTED ABOUT YOUR FINAL SELECTIONS !!!!

https://www.eng-tips.com/viewthread.cfm?qid=207269

https://www.eng-tips.com/viewthread.cfm?qid=224670

https://www.eng-tips.com/viewthread.cfm?qid=475287

More information please ....

MJCronin
Sr. Process Engineer

 

[EdStainless]

Materials Selector for Hazardous Chemicals
Michael Davies
Ammonia and Caustic Soda
Publication No. MS-6
Materials Technology Institute

This book contains everything that you need to know about materials and Caustic.

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P.E. Metallurgy, consulting work welcomed

 

[kootheBUNNY]

The %NaOH is around 48-50.

Also, do you have a PDF file or link to that book, Ed?

 

[pierreick]

Hi,

https://www.amazon.com/-/zh_TW/Michael-Davies/dp/1576980316

597$
Pierre

 

[pierreick]

Hi,
In line with Dow chemical handbook,

https://nickelinstitute.org/media/4341/nickelpub10019_causticsoda_20pg.pdf

Good luck.
Pierre

 

[MJCronin]

BUNNY man ...

Thanks for all of your help and professionalism in answering legitimate questions ..

Posing and answering questions help us all in improving this forum

Sir, you are a true mature professional .... and not a self-centered and hostile "third-world" information suck

Thanks again, sir



MJCronin
Sr. Process Engineer

 

[EdStainless]

Not a legal one. If you have specific questions about concentration/temperature/flow I could pull some tables for you.
(I have it legally, but not to share)

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P.E. Metallurgy, consulting work welcomed

 

[Iomcube]

We in chloralkali industry safely use PP pipes for this