×
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

O-Ring seal between Pipe joints...

O-Ring seal between Pipe joints...

O-Ring seal between Pipe joints...

(OP)
Hello,

           We have a 66" O.D. Scraper launcher barrel which has an O-ring on its door. it has been noted that frequent opening and closing to the launcher's door causes a leakage from the door. The type of fluid running in the pipe is treated water.

My questions are:

1) Is there a possibility that the Metal Groove designed for the O-Ring expands causing the ring to loss it's shape?
2) Can this problem be solved using a larger ring?
3) Are there any recommendations you can help us with?


Information about the ring
O-Ring: 1630.65 MM ID, 1644.65 MM OD, 7.0 MM WD/THK, NBR 70 Shore A Hardness, -40 to 110 DEG C, Hydraulic, Pneumatic service, Nitrile Rubber, INCH, BLACK, US AS568A, RING O; Gasket; 1/4" DIA; 64-3" OD.

Ammar A. Zaatari
Plant Engineer
SWID/SWIEU
Tel:  03 877-2263
Fax: 03 877-2239

RE: O-Ring seal between Pipe joints...

Launcher doors are always hard to seal, especially the larger ones such as yours.  How often do you replace the ring?  Does it leak when a new ring is fitted? Are you using any grease?  How bad is the leak?  Do you not isolate the launcher for normal operation and only have it online when you are pigging?

RE: O-Ring seal between Pipe joints...

A larger cross section O-ring will be more forgiving of surface imperfections in the mating surface.  My experience with closures of the size range you mention is on pressure leaf filters.  The most reliable sealing units I've dealt with use a "D" shaped ring that is roughly 0.5"x0.75".  The pressure range sealed is usually 75-100 PSIG, oil service, and temperature from 100-350 °F.  The closure doors have a breech lock assembly, where an outer ring is rotated by hydraulic cylinders and multiple wedges riding on lugs on the vessel and its head create the clamping load.

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