×
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

extreemly smooth pipelines

extreemly smooth pipelines

extreemly smooth pipelines

(OP)
Anybody got a good reference for coating that can lower the absolute roughness for pipeline piping?

Normally i use 0.05mm (0.001 inch) for plant piping and 0.025 mm for new pipelines.

I have however heard that certain internal coating (epoxy?) can lower the roughness to as low as 0.005-0.01 mm!

Do anybody have a reference to a vendor for any such product?

Best reagards

Morten

RE: extreemly smooth pipelines

You could electropolish the ID.

Good luck,
Latexman

RE: extreemly smooth pipelines

Check with the dairy industry.  Milking parlors and process plants have very high standards as to internal quality of piping.  Don't have any ASTM specifics handy.

RE: extreemly smooth pipelines

If it is a fairly short line (I think the limit is about 2 miles) and has no bends tighter than 40d then you could pull a liner through it.  A couple of companies make them, the liners are evacuated so that they collapse, you pull them through the line and then pressure them up to form-fit them to the line.  Thickness is around 1/4 inch so you do lose some ID but they give you a couple of orders of magnitude smoother finish than anything I've ever seen done to commercial steel (and some pretty effective corrosion protection.

I don't have the details with me today, but I did a Google search on "pipeline liner rehab" and found a picture at http://www.weatherford.com/weatherford/groups/public/documents/general/wft023125.pdf

David

RE: extreemly smooth pipelines

(OP)
It seems like i need a little more info:

Length: Long +100 km
size: Large +40 inch

Best regards

Morten

RE: extreemly smooth pipelines

MortenA
The epoxy coatings you talk about are a problem at weld seams.  I've seen wads of the coating in downstream measurement equipment over time.  I've been told that the problem happens when seams fall in the middle of sags and overbends.  It is also a problem when you cut the pipe to get a short joint.

For a 40-inch line you could have someone in a pressure suit spray epoxy the line after the welds cool.

David

RE: extreemly smooth pipelines

(OP)
Or maybe just leave the last inches near the field joint un-coated and live with an average value slightly higher?

Best regards

Morten

RE: extreemly smooth pipelines

Morten, why do you want to reduce the roughness? Is it to reduce pumping cost, reduce corrosion, reduce contamination sites?  If it is pumping cost, how much can you save and at what capital cost?  Is this economically feasible?

Harvey

Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com

RE: extreemly smooth pipelines

(OP)
Im only doing the capacity calculations. This is for a new pipeline so its not about reducing the roughness of an existing pipeline. I was really just hoping for some names winky smile

Best regards

Morten

RE: extreemly smooth pipelines

I know Tuboscope do internal coating for well tubulars - they were trying to flog it to us recently- and I think they also do pipeline internal coatings.

I'd also try coating companies like Balmoral Webco and Bredero-Shaw

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