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CUI (corrosion under insulation) is a pervasive, difficult and high-liability issue for petrochemical, power, shipping, and other industries. Situational variations (meteorological, geographical, seasonal, etc.) can confound conventionally specified surface preparation attempts to achieve perfect or near-perfect metal hygiene, thus reducing expected coating life by 30 to 75 percent. Because conventional surface preparation processes have historically been unable to adequately relieve microcontamination of metal surfaces, organizations have settled for an uneasy balance between economic and physical feasibilities that exclude the possibility of achieving ideal surface preparation outcomes and rely more heavily upon barrier coatings to supply needed corrosion control.
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Aluminum alloys are widely used in engineering structures and components due to their light weight and excellent mechanical properties. However, the alloying elements which contribute to the good mechanical properties also make the alloy prone to localized corrosion. One of the most common and economic approaches to protect Al alloys from corrosion is to apply coatings as protective layers. For example, powder coatings and magnesium-rich primers (MgRP) are both widely used for the corrosion protection of Al alloys.
It is fair to say that maintenance in the worldwide oil and gas industry has changed dramatically over the past ten years. Facility owners are more than ever looking to reduce shutdown times, to improve plant efficiency and to extend plant lifetimes. With this comes the increased industry understanding about corrosion under insulation (CUI) with its deleterious impact and the ongoing desire for pragmatic high performance and cost-effective coating solutions.
Coating systems are critical in the mitigation of corrosion on pipelines and their integrated parts.Epoxies offer a multitude of positive characteristics including: high adhesion at a chemical level,excellent abrasion resistance, and reduced water permeation rates when compared to vinylesters. A newly engineered cold weather epoxy (“Epoxy-20F”) improves upon these epoxycharacteristics and exceeds that of vinyl esters.
The Offshore Oil and Gas environment is among the most corrosive in the world. It is also one of the mostdangerous. Providing safe working surfaces is a requirement of the Bureau of Safety and EnvironmentalEnforcement (BSEE) and is desired by asset owners and contractors alike. Balancing safety with production,downtime, and turn-around times is always a battle, but one coating manufacturer seems to have solvedthese issues through its development of a single coat zinc carbon nanotube (CNT) non-skid epoxy deck coatthat provides galvanic protection via the sacrificial metal’s electron transfer along the CNT quantum network.
A steel surface has been properly prepared to a white metal blast and it looks great … to the naked eye at least. But is it? Why is a surface that has the correct profile and appears to be perfectly clean typically not good enough? A standard abrasive blast will give you the profile and visible cleanliness, but how clean is it? Testing is the only way to determine. That is testing for conductivity, chlorides, and any other contaminants.
This summary is a look at implementable work and a gage of the value of future work. The strategic implementation of Surface Preparation and Coatings Automation, Standardization and Digitization of Visual Inspection, and Surface Preparation and Coatings Training Certification Program could provide cost and schedule savings. Optimizing Power Tool Surface Preparation potentially will increase Shipbuilders safety, while reducing material and labor costs.
Power tool cleaning has been a common method of surface preparation prior to coating application since the dawn of steel shipbuilding. Power tools are usually handheld pneumatic, or sometimes electric, devices that through impacting or abrasive action can remove coating and corrosion. Most commonly power tool cleaning has been used for re-work or coating repair associated with outfitting. Typically, power tools are limited to the touch up or repair of small areas or areas that cannot be accessed by bulkier equipment such as abrasive blasters.
The coatings landscape is changing dramatically with more stringent VOC laws and extractables standards for drinking water, the products owners can rely on for lining their storage vessels is shifting. The author will discuss the advantages of using high film build, edge retentive 100% solids epoxy technology for steel potable water storage tanks.
The Paint and Coatings industry uses accelerated testing to extrapolate performance in real world situations and ensure coating formulations will withstand the forces of nature and provide long-term durability. This paper will compare the performance data of the three most common accelerated exposure test methods: QUV-A (ASTM D 4587), Xenon Arc (ASTM D 6695), and EMMAQUA (ASTM D 4141) and correlate this data to the same systems exposed for 10 years in South Florida and in North Kansas City, Missouri.
A variety of systems can characterize the properties of final painted surfaces in production to optimize appearance. In order to properly control and improve the coating process, rapid, large-area 3D measurement capability is needed that can work at all stages, from initial raw substrates to the final clear coat. Recent research has identified the key spatial wavelengths of interest and worked to correlate various calculations of surface texture with subjective appearance of the coated surfaces.
This case has been selected because we see this industry doesn’t get much attention and there are several cases came to our attention in the recent past. The corrosion protection of caisson was designed using painting only and no CP system was considered. The location is adjacent to the sea and water table is about 5-6 meters.