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.

Jobs

Ball and Stem Materias - Ball Valves

Ball and Stem Materias - Ball Valves

(OP)
Good day, my client piping class requires us in a ball valve, the ball and the stem are in material SS grade 316.

One of our 20” rating 300 valve was replaced under warranty by the supplier, and the new valve has supplied materials, ball is in A105 + ENP (Electroless Nickel Plating) and stem is in AISI 4140 + ENP (Electroless Nickel Plating). Since the production time is very long, we want to move consultation with our client to accept the available valve, but to have a better argument, I want to know the differences, advantages and disadvantages if these materials (ball and stem) change.

The valve will be used in a natural gas compression station at the entrance of the station, and its position is normally open.

If anyone can help me, I appreciate it, and exuse my english.

Regards,

Viviana Rico Medina

RE: Ball and Stem Materias - Ball Valves

As a corrosion resistant coating, ENP has established anti-corrosion performance. The principal issue with it is reliability: it can be prone to breakdown. Where this happens, a bimetallic corrosion mode is established with the substrate leading to accelerated corrosion.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

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

RE: Ball and Stem Materias - Ball Valves

(OP)
Hi Steve, thanks a lot for your answer, did you have any experience where de ENP coating was breakdown?

Our aplication is natural gas and the valve is normally open, it could be improve the life cicle of the material? i refer the fact that the valve is "fail closed", and this fail is only in a shutdown event.

Thaks again.

Best regarts

VRM

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!


Resources


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