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!

*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.

Jobs

ASTM C828

ASTM C828

(OP)
Air testing of a sanitary sewer installation under ASTM C828 calls for pressure to remain above 2.5 psig for a duration that is proportional to the length of line being tested. This seems counter-intuitive to me. If only a few pipe joints are subject to pressure in testing a shorter sewer line, why is an allowable pressure loss per joint reduced when testing a longer sewer line?

RE: ASTM C828

I don't have a copy of ASTM C828, but do have a summary of it's test procedure. The test is about the volume of air lost, not the pressure. For a given diameter, say that the length of the line doubles. Both the number of joints and the volume of air in the pipe double. The test time doubles, also. Therefore, the average leakage per joint remains unchanged. For the low pressure used for the test, pressure is inversely related to volume. Pressure is measured for convenience - pressure measurement is easy, volume measurement is not.

www.SlideRuleEra.net idea
www.VacuumTubeEra.net r2d2

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


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