×
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

Low temp. piping
3

Low temp. piping

Low temp. piping

(OP)
Hello:
Somebody told me that normal temperature carbon steel piping can be used below minus 20 deg F, if the working pressure is kept below 30% of its MAWP. I cant find a reference to this in B 31.3-2000. Can somebody please point me in the right direction.

RE: Low temp. piping

(OP)
Thanks SJones.

RE: Low temp. piping

Kamakal & SJones...


Could you tell us all what the content of those paragraphs were ?

It is my understanding that carbon steel cannot be used below -20F based on the allowable stress tables in both ASME B31.3 and B31.1 ??

A little more information ???

  

RE: Low temp. piping

Why don't you take a look at the indicated subclause in order to check its content.

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/

RE: Low temp. piping

To MJCronin,

  The Table 323.2.2 note 3.) has statement,

(3) Impact testing is not required if the design minimum temperature is below ?29°C (?20°F) but at or above ?104°C (?155°F) and the Stress Ratio defined in Fig. 323.2.2B does not exceed 0.3 times S.

which may have some people thinking it is OK to use carbon steel below -20F, but it does set -155F extreme limit.

The ASME B31.3 Chapter III Materials has almost 8 pages of guidance, requirements, and limits for applying materials for temperatures below ambient conditions.  I think that is one reason SJones would have anyone read the subclause in the context of the whole paragraph. There are also considerations for fluid service, listed grades of carbon steel, thickness, welding procedures, along with impact testing requirements that are used with the Table A-1 allowables plus the Table 323.2.2; Fig 323.2.2A; Fig 323.2.2B; Table 323.3.1; Table 323.3.4; and Table 323.3.5.

'A little bit of knowledge can be dangerous.'  

RE: Low temp. piping

Thank you.  The volume of material was one reason, the other was copyright!

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/

RE: Low temp. piping

(OP)
Thanks to everybody for the information.
kamakal

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