×
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

Joint Efficiency Factor for 46 year old oil pipeline

Joint Efficiency Factor for 46 year old oil pipeline

Joint Efficiency Factor for 46 year old oil pipeline

(OP)
Hi all,
To derate the 46 year old pipeline, what joint efficiency factor to be used ( any refence) or not to reduce the factor and calculate based on wall thickness.
Thanks
10815L

RE: Joint Efficiency Factor for 46 year old oil pipeline

I think a new pipe is in order??

RE: Joint Efficiency Factor for 46 year old oil pipeline

What kind of pipe, steel, iron, concrete? Material specification? How was it stuck together? Gas flame, welded, glued?

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

RE: Joint Efficiency Factor for 46 year old oil pipeline

(OP)
Hi,
its oil tarnsfer pipeline, material is CS (carbon steel) specification "API 5L GrB". due corrosion we would like to derate it for future use.the remaining thickness is 0.13 inches. is this ok if i use 0.9 or .85 joint efficiency factor in Barlow's equation for the safe operation conditions (extra safety factor), please advise me.
Thanks

RE: Joint Efficiency Factor for 46 year old oil pipeline

Why not leave that at 1.0? It is a function of the pipe weld type. Take your safety factor by increasing the metal loss some more, because "The reduction in strength was estimated by considering average general metal loss with an added saftey margin of X inches subtracted in lieu of calculating remaining strength based on actual measurements of maximum corrosion pit depths and group patterns."

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

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