Protective Coatings for Hot Water Vessels 2

[sbush]

Can anyone recommend an air-dryed coating system for painting the interior of carbon steel pressure vessels for hot water service at 160 - 220 degrees F. Our normal paint supplier (Tnemec) doesn't have a product that can reach the 220 deg. limit. We have an oven, but would prefer not to use it if we don't have to. It must be a spray on coating (airless or conventional).

S. Bush

http://www.water-eg.com

 

[unclesyd]

Here is company that your might want to contact. They grabbed up Plasite who used to have a coating that would take the temperature.

http://www.carboline.com/index.html

What is the end use of the hot water there might be other possibilities?

 

[SJones]

Whichever manufacturer you choose, make sure they can back up their recommendation with immersion test results and (if you have a reasonable operating pressure) decompression testing to demonstrate that the coating won't blow off when you depressurise the vessel.

Steve Jones
Materials & Corrosion Engineer

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

 

[sbush]

Thanks, unclesyd. Carboline is working on our application right now.

To sjones: the working pressure is 50 psi maximum.

Carboline has expressed initial concern about the potential for coating/surface separation due to "cold wall effect" because these vessels will not be insulated on the exteriors.

We had a problem with vessel lining separation using a PVC lining known as Miccrosol, several years ago. The manufacturer of the system, Michigan Chrome, thought that it might be caused by cold wall effect because the vessels weren't insulated. But, now I wonder if it could be from decompression or both.

Has anyone had any similar experiences?

S. Bush

http://www.water-eg.com

 

[sbush]

Has anyone ever used used a thermal-sprayed metallizing process with either zinc or aluminum wire for protective coating of a pressure vessel for hot water immersion service?

S. Bush

http://www.water-eg.com

 

[SJones]

I have heard of it being used inside oil & gas process vessels but can't find the references at the moment. It is certainly worthy of consideration, with aluminium being the best choice as zinc may suffer from a potential shift at temperature that causes accelerated corrosion of steel.

Steve Jones
Materials & Corrosion Engineer

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

 

[sbush]

To SJones:

If you find that article, please let me know. Thanks!

S. Bush

http://www.water-eg.com

 

[SJones]

NACE Corrosion 98, Paper 508, I Smuga-Otto, K E Szklarz

http://www.nace.org/nacestore/produ...8508+DEVELOPING+A+METHODOLOGY+FOR+PERFORMANCE

NACE Corrosion 99, Paper 616, T Rosbrook, M A M Swidzinski, C J Houghton

http://www.nace.org/nacestore/produ...e=99616+Thermal+Spray+Aluminium+Past,+Present

Steve Jones
Materials & Corrosion Engineer

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