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Fourteen countries, 20 states, and 76 bases…that sounds like quite a deployment! But what if, instead, you are charged with the evaluation and maintenance of over 500 water-storage tanks and related structures on those bases. Who would you turn to for professional guidance? How would you keep all of the details of the structures’ conditions and recommendations for maintenance organized in a manner that would allow you to rate and prioritize tank maintenance requirements?
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Starting in the 1940’s, solution vinyl resin coatings were used extensively to protect steel structures in fluctuating immersion service from corrosion. However, these systems fell out of favor when more restrictive volatile organic compounds regulations were implemented in the 1990’s. Since then, traditional epoxy systems have become a workhorse in the protective coatings industry. Unfortunately, these materials tend to degrade in sunlight, and experience has revealed their service life to be suboptimal compared to legacy coatings systems such as vinyls
The upper limits for the inhibitor PBTC (2-phosphonobutane 1,2,4-tricarboxylic acid) when used as the sole treatment, and in combination with other inhibitors. Both synergism and antagonism were observed for the inhibitor blends, with the interaction type being a function of ratio.
As an owner of a painting and decorating company, wouldn’t you love to be able to sit down and pick the brain of your fiercest competitor? Of course you can’t, but the idea of finding out why they’re successful, or how they solved a particular problem, is an intriguing thought. If you can’t talk to your competitor, why not talk to a painting company that would be your competitor if you were in another state? That is what Peer Groups are all about.
An experimental setup was designed to investigate the cathodic protection (CP) penetration into coating disbondment. Embedded detection probes underneath the disbondment enabled pH and steel potential measurements without disturbing the environment inside the disbondment.
As a Central source for water distribution, emergency services, and communications transmission, the Penn Avenue Tower represents a focal point for the City of Richfield, Minnesota. The 1.5-million-gallon water tower is a multi-column elevated style tank located in a residential and commercial business area on shared property with the City’s No. 2 Fire Station. An engineering evaluation identified the need for complete replacement and maintenance repair of exterior and interior coating systems, along with accessory modifications.
Coating practitioners are aware that single coat, thick film solvent-free epoxy linings have gained acceptance for their promise of productivity benefits which include a potential quick return to service for newly applied tank linings. From the vantage point of owners, applicators, inspectors and coating manufacturers this paper examines productivity and performance issues associated with a tandem approach of using a thin film solvent borne epoxy holding primer (especially over pitted steel) with a coat of solvent-free epoxy lining as opposed to using a single coat of a solvent-free lining applied direct to metal.
Waterborne coatings are of growing importance in appliance, automotive refinish, concrete, traffic marking and high performance coatings due to increasing environmental regulation to reduce volatile organic compounds (VOC) and ease of handling. The resins commonly used for conventional solvent borne coating are usually modified by increasing their hydrophilic nature prior to being incorporation into a waterborne coating formulation.
Coatings designed for heavy duty applications in the maintenance and protective coatings market are exposed to aggressive environments such as aggressive chemical solvents, marine atmospheres, UV light, abrasion, among others. In the US as well as other areas of the world, coatings designed for these applications have been primarily solvent-borne.
In an effort to address cost issue associated with shop application of conventional 3-coat systems, FHWA completed a study to investigate the performance of eight one-coat systems and two control coatings for corrosion protection of highway bridges. Based on prior performance, a three coat system and a two coat system were selected as the control coating systems.
Alloy UNS N07718 (hereafter abbreviated as 718) is one of the most versatile precipitation-hardened nickel-based corrosion-resistant alloys (CRAs) used for both surface and sub-sea components in oil and gas production service. API 6ACRA1 provides heat treatment windows and acceptance criteria for 718 in these oil and gas production environments, in which the heat treatment is intended to obtain high strength and to minimize the formation of δ-phase at grain boundaries. As pointed out in NACE MR0175 Part 32 (Table 1), field failures of 718 components in sour service are primarily related to stress corrosion cracking (SCC) at elevated temperatures and hydrogen embrittlement in the lower temperature range. The latter is specifically called galvanically induced hydrogen stress cracking (GHSC or GIHSC), which is typically caused by atomic hydrogen uptake from galvanic corrosion or cathodic protection (CP) when 718 is used with steel components in a seawater environment. CP is normally used to protect steel component from corrosion in subsea environments.