×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

materials selection for pipes

materials selection for pipes

materials selection for pipes

(OP)
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

RE: materials selection for pipes

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."

RE: materials selection for pipes

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-...

MJCronin
Sr. Process Engineer

RE: materials selection for pipes

Try the Handbook of Corrosion Data published by ASM International.

RE: materials selection for pipes

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

RE: materials selection for pipes

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.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

eBook - The Future of Product Development is Here
Looking to make the design and manufacturing of your products more agile? For engineering and manufacturing organizations, the need for digital transformation of product development processes just became more urgent than ever so we wanted to share an eBook that will help you build a practical roadmap for your journey. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close