Anticorrosion Coating for bends

[Mboundi]

Hi,
I have to select an anticorrosion coating for the bends of a 16" offshore pipeline with a design temperature of 35°C. Ambient temperature is 15°C. Design life 50 years.

Designer propose a polyurethane coating system (airlees spray applied) with 5 mm of thickness.
Wath is the best choice between polyurethane coating and epoxy coating?

Is this thickness acceptable?

Thx

 

[BigInch]

With epoxy, especially offshore, you might want a poly coating on top for mechanical strength anyway.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[Mboundi]

OK BigInch.

But I have some doubt about the thickness of coating (5 mm).
Data sheet of materials that I encountered in the past gave a maximum thk of 3 mm.

Thx for support!

 

[BigInch]

5 mm is not a problem. Perhaps the 3 mm was just a thickness to be applied, not a maximum.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[BigInch]

Actually 5 mm sounds very thin.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[SJones]

The best choice is the one that passes all of the qualification testing that you will, of course, have defined. Thicker does not mean better.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[rodneybennet]

You may also want to check

http://www.composite-agency.com/materials-forum.htm,

specifically the thread on FBE epoxy coating by Neal Prescott:

http://www.composite-agency.com/messages/3968.html

Regards,
Rodney

 

[BigInch]

Yes, even not having experience with that product, I would tend agree with that, especially noting where he says the thickness of the abrasion resistant FBE (no additional mechanical protection coating) is 150 mm.
5 mm no.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/