×
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

API 6D Valve Leak Rate

API 6D Valve Leak Rate

API 6D Valve Leak Rate

(OP)
I have some valves that are leaking under approx 80 psig. They are 3" steel ball valves with a PFE seat, 1/4 turn with a stainless full port ball. The spec sheet says they are designed to API 6D and were tested with API 598. What is the designed leakage rate from new? Where would I find the API specs on this? thx!

RE: API 6D Valve Leak Rate

API-598 Table 5.

RE: API 6D Valve Leak Rate

If you go to API 598 you will find high pressure test with water at 1.1 x rating pressure as ASME B-16.34, low pneumatic test at 5 bar and very low pneumatic test 0,5 bar (this last one is supplementary).
My default to buy the valves is high pressure test wit water and low teste with air EVER.

RE: API 6D Valve Leak Rate

Pern1971, I note that you indicate your valves are designed to API 6D, if constructed to that standard then 6D requires that there be no visible leakage during tests for such soft seated valves. I understand API 598 has similar criteria.
Cheers,
John

RE: API 6D Valve Leak Rate

API 6D and API 598 both call for a tight shut off if the valve is soft seated, the leakage rate differs between the specifications when you move to metal seat designs. the preesure you work to will depend on class rating, as mentioned above both the API specs refrence B16:34 for pressures based on a material basis. Please take note that both the API standards are factory acceptance standards are nul-invoid if the valve has been subject to service.

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