materials selection for pipes 1

[andradesilva]

Hi,

I would like to select a material for pipes which will transport saline water. However, I can't find materials selection charts for corrosion resistance.

Where can I find (books, articles) a chart or table which compares several engineering materials according to these metrics:

-Corrosion rate (mm/year or mm/month) on pure water and on saline water,for common engineering materials
-Corrosion potential, in general, for common engineering materials.

I tried to find this information, but I could only find a few results for very specific materials.

Thank you,
Best regards,
AndradeLopes

 

[SJones]

https://www.nickelinstitute.org/search/?searchTerm=pure+water

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

The preferred approach is to identify standard industry practice, not attempt a solution from first principles. Many folks have before us a cleared the path.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[mk3223]

Hope it helps...
Corrosion Data Survey by NACE

https://store.nace.org/corrosion-data-survey-metal-section-sixth-editio

 

[MJCronin]

Selecting the best piping material for liquid transport depends on many factors besides corrosion resistance.

Some of these are:

- Bending Strength, with attention paid to span lengths and support types
- Surge pressure in the system and the strength of the welded joint or coupling attachments
- Pressure drop and overall lifetime cost of pumping
- Valve and flange costs
- Stiffness and resistance to vibration.

Your "saline water" can mean many things ...

Generally speaking, I suggest that you consider complete plastic PVC/CPVC systems first (only if your maximum operating temperatures are low) then go to the nickle based alloys based on cost and the pREN number.

Flange and Valve costs for both types of systems are FAR MORE than the carbon steel flanges !!!

Also consider the cost of installation .... plastic systems are cheaper to install

More information in the 7th edition of the Classic ...:

https://www.amazon.com/Piping-Handbook-Mohinder-L-Nayyar/dp/0070471061

MJCronin
Sr. Process Engineer

 

[mrfailure]

Try the Handbook of Corrosion Data published by ASM International.

 

[EdStainless]

Can you use non-metallic? Either plastic or FRP?
With metals you will need to know the minimum pH, max temp, and max Cl levels.
If the pH is below 6 and the Cl above a few thousand ppm then you are talking about high alloy (expensive) materials.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[LittleInch]

For saline water oxygen content and temperature is also critical.

Very low (ppb) levels of oxygen and then you can use Carbon steels, highly oxygenated warm / hot sea water and you're into plastics or exotic (i.e. super expensive) materials.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.