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Tag Archives: Industrial Painting

Types of Maintenance Painting Surveys

Types of Maintenance Painting Surveys The purpose of maintenance painting is to preserve structures and equipment from premature failure and maintain them in appealing condition. There are three types of surveys that can be conducted to establish a maintenance painting program; minimal walk-through,mid-level and detailed maintenance painting survey. Minimal walk-through survey A minimal walk-through maintenance painting survey involves a subjective visual assessment of the overall condition of the coatings within a given area of the facility (lock, dam, public use area). The coatings within the areas are rated according to the painting needs of high, medium, or low priority, or some other qualitative rating scheme such as no coating work required, touchup only, or complete removal. When using a priority grading scheme, corrosion, process, contamination, safety, etc. all may be utilized as criteria. It may be helpful to conduct a quick walk-through of the facility to obtain an initial understanding of the range of coating conditions found [...]

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Corrosion Control

Corrosion Control Everybody is familiar with the results of the corrosion on metals which are observable as red-brown or green-blue rust (iron oxide). The actual process of corrosion is less noticeable and research still conducted today for better understanding of the mechanisms and how to control it. Although corrosion engineers faced with a difficult challenge, there are several tools that can be implemented in the corrosion control designs, including: Design of Structure Corrosion Inhibitors Material Selection Cathodic Protection Alteration of the Environment Protective Coatings Design of Structure How a structure is designed can influence its resistance to corrosion. Generally speaking, corrosion control designs: Eliminate possible entrapment of water, chemical salts and other matter that could promote corrosion “hot spots”. Hot spots are areas particularly conducive to accelerated corrosion, and are often referred to as “critical areas”. Eliminate complex shapes like back to back angles and orientation of members that could [...]

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Metallic Abrasives

Metallic Abrasives-Shot & Grit Abrasives The abrasive blasting materials is important because they determine the surface profile produced. Metallic  abrasives (shot & grit) are used primarily to blast clean steel and forged or cast iron where a surface profile is seldom critical on the finished product. Some examples of metallic abrasives include: Cast steel is a hard metallic abrasive used to remove scale and other hard surface deposits. Steel grit abrasives have irregular shapes and are effective in cutting away surface deposits or imperfections. Steel grit is expensive and is generally used only in recycling systems and when cheaper abrasives are unavailable. Because steel grit can be recycled, it reduces the overall waste stream. Steel shot is spherical; it can be produced accidentally as a byproduct or intention-ally for blast cleaning. Steel shot is good for heavy brittle deposits. Because of its spherical shape, it ricochets in enclosed areas and causes [...]

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Purpose of maintenance painting program

Purpose of maintenance painting program There are six reasons to properly develop, implement, and maintain a maintenance painting program: facility upkeep, corrosion protection, aesthetics, cost savings, energy conservation, and safety/identification. These factors all enter into the maintenance painting program decision-making process. Facility upkeep Facility upkeep is an all encompassing concept. How smooth or well an operation functions can be a direct result of management’s commitment to both the long- and short-term benefits of continual surveillance and remediation of corrosion. When the owner provides for continued maintenance, unscheduled shutdowns because of equipment and/or structural corrosion related failures can be avoided. The rehabilitation of the facility then can be maintained through planned downtimes and/or scheduled preventative maintenance procedures. Corrosion protection Corrosion protection, combined with loss of structural integrity, is generally the overriding and primary purpose of a maintenance painting program. When properly designed and maintained, major and costly procedures (complete removal and [...]

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Coating Defects 2

Coating Defects 2-Common Coating Failures and Causes Blistering Blistering is dome- or circular-shaped projections of the coating film held away from the substrate Blisters can have irregular shapes, depending on the cause. They may be filled with pure water, solvent, caustic, gas, oxygen, crystals, or rust. The basic cause is a loss of adhesion in localized areas. They can be any size and distribution. Numerous factors can lead to blistering, but the most common is a contaminant of some kind left on the surface after cleaning. In atmospheric service, the blisters may be caused by coating over: oil, moisture, grease, dirt, dust, soluble pigments and retained solvents.In immersion or buried service, blistering can also be caused by electro-endosmosis due to: an overactive cathodic protection system, stray currents, osmosis caused by trapped soluble salts Do not to break blisters unless it is to test them or their contents to determine cause. [...]

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