×
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

Mill test pressure

Mill test pressure

Mill test pressure

(OP)
I would like to know what exactly means mill test pressure, is the pressure at the factory before a piece of pipe leaves the manufacturing plant or is it a design pressure...?
Thank you

RE: Mill test pressure

Mill test pressure is a pressure test conducted by the mill which supplied the pipe.

RE: Mill test pressure

I would assume that it is the pressure actually used for testing the pipe in the manufacturing process, and bears no relation to your design pressure.  Presumably the design pressure would be lower, particularly if used at higher temperatures.  The test pressure should be set by the ASTM standard under which the pipe is made, while the design pressure would be controlled by the pipe or vessel spec the piping is used for.

RE: Mill test pressure


Pardon my ignorance but if I should require pipe for a certain design pressure, should I go for a pipe of about the same mill test pressure? A pipe with mill test pressure of about 3.5 times my design pressure?

How does mill test pressure guide me in evaluating the suitability of the material [pipe, say] for my requirement?


RE: Mill test pressure

You need to review the MTR carefully and determine if the mill test pressure = hydrostatic test pressure per either ASTM or ASME Standard Specifications. I have seen on incoming MTR's mill test pressure as the hydrostatic test pressure.

RE: Mill test pressure

General specification for pipe mill hydrotest is SA 530,
this specification clearly defines the hydrotest pressure.
This pressure test must be conducted by the pipe manufacturer, or another code permitted material certifying
bodies.( PG-11 in section I permits boiler manufacturer making certification, also section VIII Div1. etc..)

RE: Mill test pressure

As per ASME Code you should test your piping or equipment system after fabrication with test pressure which is stipulated in Code.
This is regardless of mill pressure test in mill shop.
So we can not consider the mill pressure test instead of field pressure test which is requirement of Code.
 

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