×
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!
  • Students Click Here

*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

Jobs

Nylon Ball Valve Seats in Sour Service?

Nylon Ball Valve Seats in Sour Service?

Nylon Ball Valve Seats in Sour Service?

(OP)
Hi there,

Through my so far limited experience, I've noticed that most NACE, low temp, trunnion mounted ball valves in CL600+ come standard with Nylon seat inserts. I'm wondering: are Nylon seats in your typical NACE Low Temp trunnion mounted ball valve CL600+ suitable for sour design/service pipelines?

My client's specs call for RTFE seats for these kinds of valves, however I feel like they could save a lot of money and lead time if they accepted Nylon seats in sour service applications. When we order valves for them, they have to be modified simply to put the RTFE seats in because they come stock with Nylon seats which obviously adds cost and lead time. I have done some of my own research and although I still don't have a clear answer, I've got the impression that Nylon seats aren't suitable for sour service, which is strange to me considering the valve is considered NACE compliant (although I'm 99% sure that NACE MR0175 refers to only metallic materials in sour service). That just seems crazy to me that a valve would be considered NACE compliant and yet still not be suitable for sour service.

Any guidance on this issue would be greatly appreciated. Thanks.

A

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