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This technical report provides practical information on the use of encapsulated blast media for repairing existing interior and exterior coatings on railroad tank cars (hereafter referred to as tank cars). This report: 1) introduces the technology; 2) describes typical abrasives, equipment, and processes used; and 3) provides a comparison to some other coating repair surface preparation methods typically used in the rail industry.
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This standard practice addresses the need for quality application of coatings to the interior surfaces of steel rail tank cars transporting molten sulfur. It covers surface preparation; selection and application of coating materials; inspection of the completed coating system; and testing using adequate, readily available instruments. This standard provides guidelines to the builder, owner, shipper, and all those involved in the production and use of rail tank cars intended for the transport of molten sulfur.
The purpose of this technical committee report is to increase railcar industry awareness of nonvisible surface contamination (NVSC), its impact, and its removal before coating application to the railcar. For the purpose of this report, NVSC is defined as any substance that may affect coating performance and does not leave a visible deposit on a bare or previously coated carbon steel surface. This report discusses how NVSC may have a harmful effect on the performance and lifespan of a coating system. This report also identifies types of NVSC and methods for its removal.