×
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

hydrostatic testing of pipelines
2

hydrostatic testing of pipelines

hydrostatic testing of pipelines

(OP)
I am in the process of pressure testing an HDPE pipeline that currently contains water and i'm sure a certain amount of air. Is it imperative that I expel the air first? and why. How will it effect my test if air is left in the line. Thank you

RE: hydrostatic testing of pipelines

STAFFMAN:  It is usual to remove all the air when hydrotesting.  The air can compress and if the pipe fails there will be an explosion and shrapnel all over.  If the test medium is water, everyone just gets wet.  It goes without saying to keep all people a safe distance away from the test article.

Regards
Dave

RE: hydrostatic testing of pipelines

Perhaps a non-issue...but on typical rubber-jointed pipe, you have a leakage allowance.  I assume the volumetric leakage rate would be a lot higher if you were leaking air than if you were leaking water.

RE: hydrostatic testing of pipelines

There are specific testing protocols for HDPE pipelines that are different to ferrous pipelines. Download a copy of AS 2566.2 from Standards Australia or find similar treatise in WRC or AWWA websites. You may want to investigate the Driscopipe website as they may have the test procedure there.

The main difference is that the HDPE suffers from creep during the application of the test pressure. This is compromised by air in the syste. The test procedure is aimed at ensuring that you measure a pressure rate to reflect the creep and that all the air has been expelled.

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