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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.
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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.
Since 1982, there has been a move to Thermal Sprayed Aluminum (TSA) coating in the “splash zone” of offshore structures. Our experience indicates that an experience applicator, good surface preparation and quality of wire combined to achieve required thickness and apply the sealer to seal the entire surface.
In this paper the approach of an Oil Company is demonstrated from the initial choice between different primers: inorganic zinc and organic (epoxy) zinc., to all the preliminary pre-qualification tests, the subsequently field test performed, and the procedures adopted, costs included.
Corrosion protective coatings deteriorate for a number of reasons including insufficient surface preparation and deficient thickness. This paper discusses the mechanisms of failure and provides a technical overview regarding the deterioration aspects of coatings.
The purpose of this work is to study the impact of the quality of steel surface preparation and the level of soluble salt contamination on the performance and durability of protective coating systems.
Three recent international pipeline projects illustrate that the typical surface profile height and abrasive blast cleaning requirements in today’s coating standards and specifications have not been sufficient to define the adequate level of the abrasive blasting.
Today the complaint is that there are too many standards for surface preparation by water jetting. A comparison of the NACE/SSPC, German, Navy, and proprietary standards, the areas of application, and future goals will be presented.
Currently, Ships’ Force (SF) conduct maintenance and repair painting during pier-side periods as well as while ships are underway. SF commonly use epoxy primers, such as MIL-DTL-24441, Type IV, for maintenance painting and in some cases, chloride contamination and surface profile is not adequately controlled. The Naval Research Laboratory (NRL) conducted a study to verify the efficacy of replacing the current epoxy primers commonly used by SF with more “user friendly” high-build, high-solid primers.
There are a number of petrochemical plants that experience equipment failure and production loss due to corrosion. Proper maintenance of their existing equipment greatly reduces a plant’s down time therefore allowing production to continue. For those facilities that do not have an existing maintenance-painting program, we have developed a beginners / non-technical program guide that is easy to understand and implement as it addresses many plant’s existing and future coating systems.
This paper examines the restoration of the Robert F. Kennedy (Triborough) Bridges - lead removal and painting approaches for the three bridges which compose one of the largest and most controversial structures in NYC. The techniques employed reflect typical approaches as well as some unique operations associated with the rehabilitation of major bridge structures.