Coatings are the first line of defense in protecting the integrity of your assets. CST Trico Bond bolted epoxy steel tanks using the OptiBond&#; coating process delivers outstanding performance and is the industry standard for epoxy durability, is corrosion resistance, and resists UV breakdown and abrasion. As the world&#;s leader in factory coated tanks, CST understands that the process by which a coating is applied is as important as the coating itself.
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Tight manufacturing tolerances and numerous process controls are in place to ensure that the preparation of the steel, application of the Trico Bond coating and the curing of the coated material is unmatched. While other companies make claims about how proprietary the name of their epoxy product is, CST continues to invest in the OptiBond process to ensure it delivers superior performance and long-lasting results when applying CST Trico Bond coatings.
With more than 130 years of experience and over 250,000 field-tested applications around the world, no other manufacturer comes close to our level of knowledge of how to apply epoxy coatings and how they endure in some of the harshest environments. CST is proud to have our potential customers visit our ISO : Certified manufacturing facilities and see first-hand why CST&#;s coating processes are in a class of their own.
Benefits of Factory-Applied Coatings
CST applies all coatings in an ISO : Certified facility, under controlled environmental conditions using its proprietary OptiBond coating process to deliver the finest epoxy coating available in the storage tank industry. This eliminates weather factors that occur when applying coatings in the field after constructing a tank. There is no waiting for the weather to be within specific conditions in order to apply the coatings. Each step in the OptiBond coating process is carefully monitored so that inconsistencies in the coating can be detected in the earliest possible stage of the process. Completion of the tank can be performed in as much as 1/3 the time as alternative materials and methods. On-site delays due to weather are eliminated, and service can start earlier and return on investment begins sooner.
The CST OptiBond Coating System
CST Industries utilizes proprietary coating technology that provides maximum corrosion resistance and long tank life. Our experience has led to continuous technology and process improvements. The result is the finest epoxy coating available in the liquid tank industry. The OptiBond coating system is derived from years of in-field experience and performance data.
The OptiBond Coating Process:
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Experience with Epoxy coating for interior of large diameter tanks
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(Chemical)
(OP)
27 May 03 18:04We are in design process of for a large tank farm (4-tanks, 300K gallons each, one spare), for use in RCRA waste tank farm on a fast-tracked project. Tanks will be insulated and heated to maintain fluid temperature of 100F.Waste will contain less than 10% NaOH, water, and less than 40% organic, some of which (5-10% total) will separate out in an upper layer during storage.Waste may be stored from several months to 2 years before disposal facility can be constructed. Iron contamination for one of the potential treatment processes is an issue.Organics will consist of a relatively large-chained mercaptan, Ethylmethyl Phosphonic Acid (EMPA), Methyl Phosphonic Acid (MPA), relatively large-chained disulfide, and other organics of small concentration. Tanks will have nitrogen blanketing.Designer is recommending a epoxy lining (Plasguard ) concern has been raised about epoxy coating failures with respect differences in thermal expansion of the coating versus underlying carbon steel (tank diameter is 42 ft), coating rigidity, and/or acceration of epoxy coating adhesion loss with respect to "hot water" acceration.I am interested in hearing from someone with experience with coating large tanks storing similar materials.Thanks
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(Chemical)
3 Jun 03 09:02I have used another Plasite product for lining demineralized water tanks and have experienced no failures to date. Demineralized water is very corrosive.
Surface preparation is the most important step. White metal blast and a good QA/QC program is mandatory for a long service life.
Insulating the tank and heating the contents would minimize my concern about coating adhesion. You are minimizing differential heating as the sun tracks across the sky.
Have you considered a vinyl ester coating? Or field erected FRP tanks?
(Mechanical)
14 Jun 03 17:32I had a similar problem with demin water storage in a 30 feet diameter tank , 15 feet high. The most economical solution was to buy an epoxy coated tank , fabricated from small pannels , bolted together to create the tank.
I had major quality problems during construction , the construction crews being 'imported' unqualified people , who managed to let gear fall on the surface of the pannels and mishandle the stored pannels.
Luckily for them , all surface damages were on the oustide of the pannels , and a new protective coating was sufficient to permanently repare the damages.
However , the whole construction process is a very tedious and carefull job , not leaving me with a confortable feeling , even now. If I had to redo the whole thing , I probably would have settled for a big concrete 'swimming pool' covered with several layers of an adequate internal lining , even when this was more expensive.
(Specifier/Regulator)
23 Jun 03 11:44Guys,
The difference between the latter 2 tanks and the original owners query is that your tanks are in Demin water service, and his isnt. I would suggest a far better solution to the original problem is to line the tanks with a solvent free (100% Volume Solids) Glass flake reinforced Vinyl Ester coating applied in 2 coats at 500-750 microns per coat
(20 to 30 mils.) This will be more suitable to the environment you will experience. There are some very valid points about surface preparation and stringent independent QA/QC. Do not rely on the application contractor to provide this on your behalf.
(Chemical)
29 Jun 03 20:18We have coated the internal sections of waste water (RCRA) tanks with polyurea (100% polyurea aromatic) and have good success. Polyurea is a fast (less than 15 seconds) curing high performance coating. Highly chemical resistant. It exhibits high adhesion characteristics on steel, concrete, wood, fiberglass, etc. The key (repeat "KEY") to a successful application is surface preparation. It is important that the surface be cleaned, blasted to a 2 to 4 mil profile, cleaned again with a hot solution of TSP (trisodium phosphate), pressure washed with + psi water. If steel is new this should get it prepared for coating. If the steel was in service, it should be checked for chloride residual. If none dry, and apply 120 mils of polyurea. The application should be from the top down in a cross/hatch pattern to get even coverage of coating.Before applying coating to floor of tank, re-pressure wash to remove any environmental contamination and overspray that occurred while applying to the top and walls. Then dry and apply polyurea to metal. Make sure all termination points are outside of tank. In other words, spray out the flanges and tie back on the exterior of the tank by a 6 inch margin. Otherwise there is a possibility for coating to delaminate from intrusion of liquid. The tank should be cured for at least 3 days before opening to service.See: www.rapidcoating.com
(Materials)
24 Jul 03 15:44You might check with Devcon:If an epoxy winds up not being adequate, you might consider a thermally sprayed metallic coating.
(Chemical)
29 Jul 03 11:40Has 100% FRP construction been considered? There are a few companies that can build FRP tanks as large as you require. Resistance to organics is of primary concern, but a novalac epoxy vinyl ester resin (i.e. DEREKANE 470) should suffice.For manufacturers to build this type of equipment, see:With straight fiberglass construction, there are no concerns with chipping, peeling, or other degradation of a liner. The corrosion barrier as well as the structure are all resistant to chemical attack.
(Materials)
29 Jul 03 13:24 http://www.belzona.com/polymers.html
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