×
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

Comparing of pipe thikness in ASME B31.3 and 31.1

Comparing of pipe thikness in ASME B31.3 and 31.1

Comparing of pipe thikness in ASME B31.3 and 31.1

(OP)
Hello,

In our piping spec for refinery is written
"As a minimum requirement, piping shall be designed in accordance with ASME B31.3, Process Piping. Steam, boiler feed-water and blow down piping, associated with steam generating equipment shall be designed in accordance with ASME B31.1"

I cheked the thickness calculation for above services (steam, blow down, ...) but they also calculated as per ASME B31.3.
My question is this:
1- Is it required the thickness for steam lines in refinery to be calculated as per ASME B31.3 or not?
2- What is the difference between thickness as per B31.1 and 31.3? which code has more safety factor? which thickness is bigger and why?

Thanks and Regards,

RE: Comparing of pipe thikness in ASME B31.3 and 31.1

Suggest that you re-post in the Piping & fluid mechanics engineering forum.

You will get a more lively discussion

-MJC

 

   

RE: Comparing of pipe thikness in ASME B31.3 and 31.1

The diference is in the Allowable Stress Values of the table A-1 from B31.1 and B.31.3. When you calculate the minimun required thickiness of pipes the equation depends from this value and it changes.
The pipe used for Steam, boiler feed-water  services normaly has a corrosion allowance of 0.125 while there are other services where is 0.0625.
These a pair of reasons of the diference
 

RE: Comparing of pipe thikness in ASME B31.3 and 31.1

Process steam lines (Non-boiler External Piping) in Refineries are often designed and constructed per ASME B31.3. That piping specific to the boiler or steam generator (boiler feed blowdown, Boiler Extenal piping is normally per B31.1.

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