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Gold/Mining/Energy : Napier International Technologies Inc. (T.NIR) -- Ignore unavailable to you. Want to Upgrade?

To: Rich Kaiser who wrote (257)	6/8/1998 11:49:00 PM
From: Ginco	Read Replies (2) \| Respond to of 2444

Rich anything you could add to this? Message 4316149 PACIFIC NW POLLUTION PREVENTION RESOURCE CENTER POLLUTION PREVENTION RESEARCH PROJECTS DATABASE Project Title: Aircraft Depainting Technology Date Last Updated: 11/96 Project Summary: Current chemical paint strippers contain hazardous components like phenols, methylene chloride and chromates. Paint removal operations at maintenance depots have been determined to be a major contributor to hazardous waste generation at the Department of Defense. Alternative methods of coating removal that meet increasing waste disposal constraints are being developed to maintain aircraft rework operations while reducing hazardous waste generation. These techniques need to be optimized and evaluated for use at Naval Aviation Depots. The goal of this project is to develop and test a non-hazardous replacement for chemical paint stripping used on various Navy aircraft, weapons, and ground support equipment. Because there are so many different substrates/alloys and coating systems currently used by the Navy, these non-hazardous paint removal processes will have to be versatile. Naval aircraft have different load bearing structures (higher strength) to withstand aircraft carrier landings. In addition, the Navy's operational environment can have a seriously deleterious effect on the structural integrity of aircraft skins. These issues complicate the stripping process for naval aircraft. This program will identify the best alternatives from existing and developmental methods such as non-hazardous chemical paint strippers, (i.e. materials that do not contain chromates, methylene chloride, phenol, etc.), mechanical removal procedures (PMB, water jet stripping, etc.) and thermal removal methods (laser, FlashjetTM). Procedure efficiency, effects on substrate surface, hazardous waste generation and applicability will be investigated in order to determine the best procedure for Navy applications. Comparison of techniques as well as advantages/disadvantages will also be performed. Mechanical removal procedures eliminate the use of hazardous chemicals, however, several individual mechanical techniques damage the substrate surface during the removal process. Since some sections of aircraft skins are very thin, this is not acceptable. However, if several techniques are combined to remove the coating the surface damage could be eliminated/minimized to an acceptable level. For example one possible combination is flash lamp/dry ice stripping (Flashjet). The flash lamp degrades the coating system and the dry ice simultaneously removes the residue at a reduced pressure, causing less surface damage. Finally, the treatment of the blast media used in these mechanical techniques will be studied in terms of waste generation. During 1995, investigation of advanced coatings removal processes led to the implementation of an Ultra-High Pressure waterjet (UHP-WJ) system at Naval Aviation Depot Jacksonville. The UHP-WJ system removes abrasion resistant metallic/ceramic coatings from Naval aircraft engine components. This system eliminates the need for acid chemical and abrasive blasting stripping of these coatings. The UHP-WJ system filters and recycles its process water and therefore generates near-zero waste. This system will operate on a full production basis in early 1996 and return on investment (ROI) is expected less than six months. Nine P-3 aircraft were successfully depainted with a non-hazardous air pollutant chemical at Naval Aviation Depot Jacksonville. Data was gathered on the loss of effectiveness below 700 F and the associated waste from this process. In July, 1995, the flash lamp/dry ice prototype process was successfully demonstrated on a Navy F/A-18 radome at McDonnell Douglas Aerospace in St. Louis. Project Keywords: paint stripping, materials substitution, waste recycling/reuse, flashjet, waterjet, enzymatic paint degradation Organizing Performing Research: US Navy -- Naval Air Warfare Center Aircraft Division Warminster, Naval Research Laboratory, Naval Aviation Depots, and the Lead Maintenance Technology Center for the Environment Primary research Contact: Joseph Kozol Naval Air Warfare Center Aircraft Division Patuxent River 4.3.4.1.0.0.A MS 03 Bldg 2188 Patuxent River, MD 20670-5304 Phone (301) 342-8068 FAX (301) 342-8062 INTERNET: KOZOL_JOSEPH%PAX5@MR.NAWC.NAVY.MIL