×
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

Pneumatic Test Pressure for External Pressure Vessel

Pneumatic Test Pressure for External Pressure Vessel

Pneumatic Test Pressure for External Pressure Vessel

(OP)
Dear Experts,

I have designed a pressure vessel subjected to an external pressure of 15 psi. I want to know whether this vessel requires a pneumatic test as per ASME Section VIII, Div-1, UG-99(f). I am relicating the statement here - "Single-wall vessels designed for a vacuum or partial vacuum only, and chambers of multichamber vessels designed for a vacuum or partial vacuum only, shall be subjected to an internal hydrostatic test or when a hydrostatic test is not practicable, to a pneumatic test in accordance with the provisions of UG-100. Either type of test shall be made at a pressure not less than 1.3 times difference between normal atmospheric pressure and the minimum design internal absolute pressure"

I am confused with this "minimum designed internal absolute pressure". In my case, there is no design absolute internal pressure! Shall I consider the internal design pressure to be zero? or shall I calculate internal MAWP for the design?

RE: Pneumatic Test Pressure for External Pressure Vessel

Your internal design pressure is -15 psi gage or zero psi absolute, assuming your "15 psi external" is a gage pressure. Your difference either way is 15 psi differential and test pressure is 20 psig internal.

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