extreemly smooth pipelines 1

[MortenA]

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

 

[Latexman]

You could electropolish the ID.

Good luck,
Latexman

 

[ornerynorsk]

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.

 

[zdas04]

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

 

[MortenA]

It seems like i need a little more info:

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

Best regards

Morten

 

[zdas04]

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

 

[MortenA]

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

Best regards

Morten

 

[katmar]

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

 

[MortenA]

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 ;-)

Best regards

Morten

 

[DrillerNic]

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

 

[SJones]

http://www.pipelinings.com/home.htm

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdo/