Coating Blistering in SAGD water treatment vessels
Coating Blistering in SAGD water treatment vessels
(OP)
In our SAGD facility, vessels in water deoiling unit and water treatment unit are internally coated with Two-Component Epoxy. We are experiencing severe blistering of the coating. Some blisters are 4" in dia. Does anybody dealing any issues like this? Willing to share some knowledge?





RE: Coating Blistering in SAGD water treatment vessels
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Coating Blistering in SAGD water treatment vessels
Lots of possibilities. There are failure analysis experts who specialize in paint. Cost is probably $1,000 and up. The low end is if you can take good samples and photos yourself and send them to the expert, and the cause is readily found. "And up" can also depend in large part how many lawyers are involved.
RE: Coating Blistering in SAGD water treatment vessels
RE: Coating Blistering in SAGD water treatment vessels
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Coating Blistering in SAGD water treatment vessels
RE: Coating Blistering in SAGD water treatment vessels
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Coating Blistering in SAGD water treatment vessels
RE: Coating Blistering in SAGD water treatment vessels
TomDOT: Aren't the osmotic blisters common in relatively clean water? inside the blisters the residual salts will produce the concentrated solution and natural equilibrium shift causes water to accumulate inside the blisters. isn't it? we are dealing with produced hard water? do you still expect Osmotic blistering?
RE: Coating Blistering in SAGD water treatment vessels
RE: Coating Blistering in SAGD water treatment vessels
Have you looked inside a blister yet? Collected blister liquid with a needle and syringe? Knowing what the paint looks like (discolored? soft? is the blister inside the coating, or behind all of the coating?) and what the liquid characteristics are helps. (pH, color, SMELL, if you dry some out on glass, is there residue? What does the residue look like?) - and compare the in-blister liquid to the vessel liquid.
Lots of paths to investigate, which is why I suggested an expert.
RE: Coating Blistering in SAGD water treatment vessels
http://www.jotun.com/www/com/20020116.nsf/viewunid...
NACE Corrosion 2004, Paper 04034
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Coating Blistering in SAGD water treatment vessels
Secondly, from our experience, the process water is not clean as it comes from the local ground water (usually brackish water) which contains very high concentrations of Chlorides, between 200-900 PPM, - depending on geographic area.
As for coatings, there are some very good coatings that work in the SAGD vessels, however, in the water treatment plants, there has been no coating hold up within the WAC's, SAC's or demineralized vessels. This is a very complex issue, but during the regeneration cycles, the exothermic reactions that occur during this stage are so great, the temperatures are greater than most internal coatings can handle ( 100C/212F +). The repetiveness of the regen cycle breaks down the coatings quickly, some quicker or longer than others, but they will all deteriate with time.
There are other coatings on the market that may handle the service conditions/regen cycles, but these coatings are not condusive to applying in the vessels inthe small parts within the vessels.
The solution we have found has been rubber linings.
If you can provide more information on your vessels operating conditions and type, I would be glad to discuss what has worked and not worked from our experiences. I hope this is helpful.
RE: Coating Blistering in SAGD water treatment vessels