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


Disk Strength test

Disk Strength test

Disk Strength test


I have come across the " Disc strength" test requirements for triple offset valves. This is listed in both BS5155 and ISO 12266-1. The problem is that the test calls for testing of valve at 1.5 times the rated pressure. Seals of TOV's are not designed for this. The standard says that some leak is allowed during the test. However it does not say about how the setup is and how is the result judged - based on leakage or based on failure of disc strength. Does any one in this forum know.

RE: Disk Strength test

I am not familiar with the test, but: Are you sure you have the latest issue, refer for instance to :http://www.valveuser.com/974-bs-en-12266-12012.htm ? Are you sure the test is valid for BFL valves?

All BFL valves I know of, including double and trippel offset valves, will not allow any tests above (or possible slightly above?) normal working pressure, at least if they have resilient seats. As you states this will possibly permanently damage the sealing and give leakages.

RE: Disk Strength test

Hi, I think EN 12266-2 optional tests says to test the obturator at 1,5 times (just like the hydrostatic test). This is optional not mandatory and just to chack obturator strentgh so maybe you can talk to your client of a way not to damage the seal.. Leak test (mandatory)are always at 1,1 times the design pressure at ambient temperature. If the test is with air then it must be at 6 bar +- 1 bar

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!


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