×
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

safety valve's gag

safety valve's gag

safety valve's gag

(OP)
Dear friends,

It is kindly requested to inform me some information related to application of gag in safety valves.
More over I'd like to know that the reason of gag opening due to Hydrostatic test.

Sincerely yours

RE: safety valve's gag

The gag is to prevent the valve from lifting during hydro test.  In a hydro, you are intentionally overpressurizing the system.  The valve is there to PREVENT that.  So you gag the valve down (finger-tight) so you can build the pressure well past the valve's setpoint.

RE: safety valve's gag

Hi people,

May I take the opportunity to point out that these test gags should be REMOVED and safely stored during normal operation????

I consider test gags as very dangerous, they should be red labelled and checked upon during start up procedure.  

Be aware I have seen them mounted in a full operating plant, scares the hell out of me as people are not aware of their danger! The valve will not open at set pressure with a test gag mounted.

Some manufacturers of safety valves mount them standard as transport protection with the disc screwed down to the seat firmly.....

Get out there, see for yourself if you are safe!

Marcel

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