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Conference Paper - This paper describes the requirements of the standard, additional inspection points, and several uses of the standard in the field where clear specification language was imperative to successful project completion. NACE 5/SSPC-SP 12 standard confined to water jetting - which makes use of ultra-high pressure water that is nonabrasive. Four levels of visible post-cleaning condition and three levels of non-visible condition are defined.
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A method to test new surface preparation techniques for preparing existing offshore structures for maintenance painting has been developed. This paper will explain how the tests were conducted, how effective each method was at removing salts, and how the coatings performed in the ISO and NASA tests.
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.
This paper documents the removal of floor coatings from concrete surfaces utilizing UHP water jet tools. Traditional methods, including shot blasting and grinding, meet the required production rates, but may fail to remove all of the invisible contaminants. They can also introduce dust into the environment.
Neptune Bulk Terminals in Vancouver, British Columbia needed to re-coat two of its ocean-going Potash Ship Loader conveyors within a 27-day window to prevent interruption of international ship loading schedules. The contractor elected to use ultra high pressure water jetting (UHPWJ) for the steel surface preparation rather than the sand blast medium used on the previous loader conveyors. This required innovative desiccant dehumidification equipment to facilitate rapid drying of the steel upon completion of the UHPWJ work due to an increased moisture load.
There is a wide gulf in the industry between the capabilities of water jetting and wet abrasive blast equipment capabilities and the perception of their capabilities. The misinformation frequently leads to miscommunication between the various parties involved in projects where the equipment and associated standards are used.
High pressure (HP) and ultra-high pressure (UHP) waterjetting for coating removal and surface preparation has several advantages compared to the industry standard abrasive grit blasting process. However, a major drawback of waterjetting is subsequent flash rusting of the steel surface. The color of the flash rust is typically orange, red, or brown of various shades depending on the color of the underlying steel, the nature of the surrounding environment, and the duration of exposure to the environment.
Recent US Navy and NSRP projects have explored alternative inspection techniques for evaluating flash rust on waterjetted surfaces. This paper will summarize investigations into new inspection techniques which have been performed over the past few years.
HISTORICAL DOCUMENT. This NACE International/SSPC joint standard practice covers the preparation of concrete surfaces before the application of protective coating or lining systems. The standard includes two updated tables, Table 1 details classes of surface preparation, and Table 2 provides minimum acceptance criteria for concrete surfaces before coatings are applied and relevant test methods. The updated Appendix (nonmandatory) includes two additional tables, Table A1 provides typical surface properties of finished concrete, and Table A2 provides an extensive list of surface preparation methods for concrete surfaces. This standard should be used by specifiers, applicators, inspectors, and others who are responsible for defining a standard degree of cleanliness, strength, profile, and dryness of prepared concrete surfaces.
HISTORICAL DOCUMENT. Defines the Very Thorough Cleaning (WJ-1) degree of surface cleanliness - one of four levels (WJ- 1,2,3,4) achieved by the use of waterjet cleaning.
HISTORICAL DOCUMENT. Defines the Very Thorough Cleaning (WJ-2) degree of surface cleanliness - one of four levels (WJ- 1,2,3,4) achieved by the use of waterjet cleaning.