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  • Other Sources  (9)
  • 2010-2014  (9)
  • 1
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    NASA Rocket Propulsion Test Replacement Effort for Oxygen System Cleaner - Hydrochlorofluorocarbon (HCFC) 225 (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: Gaseous and liquid oxygen are extremely reactive materials used in bipropellant propulsion systems. Both flight and ground oxygen systems require a high level of cleanliness to support engine performance, testing, and prevent mishaps. Solvents used to clean and verify the cleanliness of oxygen systems and supporting test hardware must be compatible with the system's materials of construction and effective at removing or reducing expected contaminants to an acceptable level. This paper will define the philosophy and test approach used for evaluating replacement solvents for the current Marshall Space Flight Center/Stennis Space Center baseline HCFC225 material that will no longer be available for purchase after 2014. MSFC/SSC applications in cleaning / sampling oxygen propulsion components, support equipment, and test system were reviewed then candidate replacement cleaners and test methods selected. All of these factors as well as testing results will be discussed.
    Keywords: Spacecraft Propulsion and Power
    Type: M14-3288 , National Space and Missile Materials Symposium (NSMMS); Jun 23, 2014 - Jun 26, 2014; Huntsville, AL; United States
    Format: application/pdf
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  • 2
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    The Search for Nonflammable Solvent Alternatives for Cleaning Aerospace Oxygen Systems (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: To obtain a high degree of cleanliness without risk of corrosion or hazardous reactivity, hydrochlorofluorocarbon (HCFC)-225 is used for cleaning and cleanliness verification of oxygen system components used on NASA fs bipropellant launch vehicles, associated test stands and support equipment. HCFC-225 is a Class II Ozone Depleting Substance (ODS ]II) that was introduced to replace chlorofluorocarbon (CFC)-113, a Class I ODS solvent that is now banned. To meet environmental regulations to eliminate the use of ozone depleting substances, a replacement solvent is required for HCFC ]225 that is effective at removing oils, greases, and particulate from large oxygen system components, is compatible with materials used in the construction of these systems, and is nonflammable and non ]reactive in enriched oxygen environments. A solvent replacement is also required for aviator fs breathing oxygen systems and other related equipment currently cleaned and verified with HCFC ]225 and stockpiled CFC -113. Requirements and challenges in the search for nonflammable replacement solvents are discussed.
    Keywords: Chemistry and Materials (General)
    Type: M12-2280 , 2012 International Workshop on Environment and Alternative Energy; Dec 04, 2012 - Dec 07, 2012; Greenbelt, MD; United States
    Format: application/pdf
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  • 3
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    The Search for Nonflammable Solvent Alternatives for Cleaning Aerospace Oxygen Systems (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Oxygen systems are susceptible to fires caused by particle and nonvolatile residue (NVR) contaminants, therefore cleaning and verification is essential for system safety. . Cleaning solvents used on oxygen system components must be either nonflammable in pure oxygen or complete removal must be assured for system safety. . CFC -113 was the solvent of choice before 1996 because it was effective, least toxic, compatible with most materials of construction, and non ]reactive with oxygen. When CFC -113 was phased out in 1996, HCFC -225 was selected as an interim replacement for cleaning propulsion oxygen systems at NASA. HCFC-225 production phase-out date is 01/01/2015. HCFC ]225 (AK ]225G) is used extensively at Marshall Space Flight Center and Stennis Space Center for cleaning and NVR verification on large propulsion oxygen systems, and propulsion test stands and ground support equipment. . Many components are too large for ultrasonic agitation - necessary for effective aqueous cleaning and NVR sampling. . Test stand equipment must be cleaned prior to installation of test hardware. Many items must be cleaned by wipe or flush in situ where complete removal of a flammable solvent cannot be assured. The search for a replacement solvent for these applications is ongoing.
    Keywords: Chemistry and Materials (General)
    Type: M12-2295 , 2012 International Workshop on Environment and Alternative Energy; Dec 04, 2012 - Dec 07, 2012; Greenbelt, MD; United States
    Format: application/pdf
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  • 4
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    Contamination Control and Hardware Processing Solutions at Marshall Space Flight Center (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Contamination Control Team of Marshall Space Flight Center's Materials and Processes Laboratory supports many Programs/ Projects that design, manufacture, and test a wide range of hardware types that are sensitive to contamination and foreign object damage (FOD). Examples where contamination/FOD concerns arise include sensitive structural bondline failure, critical orifice blockage, seal leakage, and reactive fluid compatibility (liquid oxygen, hydrazine) as well as performance degradation of sensitive instruments or spacecraft surfaces such as optical elements and thermal control systems. During the design phase, determination of the sensitivity of a hardware system to different types or levels of contamination/FOD is essential. A contamination control and FOD control plan must then be developed and implemented through all phases of ground processing, and, sometimes, on-orbit use, recovery, and refurbishment. Implementation of proper controls prevents cost and schedule impacts due to hardware damage or rework and helps assure mission success. Current capabilities are being used to support recent and on-going activities for multiple Mission Directorates / Programs such as International Space Station (ISS), James Webb Space Telescope (JWST), Space Launch System (SLS) elements (tanks, engines, booster), etc. The team also advances Green Technology initiatives and addresses materials obsolescence issues for NASA and external customers, most notably in the area of solvent replacement (e.g. aqueous cleaners containing hexavalent chrome, ozone depleting chemicals (CFC s and HCFC's), suspect carcinogens). The team evaluates new surface cleanliness inspection and cleaning technologies (e.g. plasma cleaning), and maintains databases for processing support materials as well as outgassing and optical compatibility test results for spaceflight environments.
    Keywords: Space Processing
    Type: M12-1881 , M12-1871 , National Space and Missile Symposium; Jun 25, 2012 - Jun 29, 2012; Tampa, FL; United States
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  • 5
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    Laboratory Evaluation of Drop-in Solvent Alternatives to n-Propyl Bromide for Vapor Degreasing (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Based on this limited laboratory study, solvent blends of trans-1,2 dichloroethylene with HFEs, HFCs, or PFCs appear to be viable alternatives to n-propyl bromide for vapor degreasing. The lower boiling points of these blends may lead to greater solvent loss during use. Additional factors must be considered when selecting a solvent substitute, including stability over time, VOC, GWP, toxicity, and business considerations.
    Keywords: Chemistry and Materials (General)
    Type: M12-1709 , Environment, Energy Security & Sustainability Symposium; May 21, 2012 - May 24, 2012; New Orleans, LA; United States
    Format: application/pdf
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  • 6
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    Powering the NASA-wide Institutional GIS with ArcGIS Server Technology (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA-wide GIS Portal Overview - Common Uses of the Portal. Proof of Concept Applications (1) Real Estate Editor (2) Personal Property (3) Asset Mapping. Plans
    Keywords: Computer Systems
    Type: SPPT-7300-0001 , 2011 Esri International User Conference; Jul 11, 2011 - Jul 15, 2011; San Diego, CA; United States
    Format: application/pdf
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  • 7
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    NASA Rocket Propulsion Test Replacement Effort for Oxygen System Cleaner Hydrochlorofluorocarbon (HCFC) 225 (2014)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: No abstract available
    Keywords: Spacecraft Propulsion and Power
    Type: M14-3709 , National Space and Missile Materials Symposium (NSMMS); Jun 23, 2014 - Jun 26, 2014; Huntsville, AL; United States
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  • 8
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    Cleaning Process Development for Metallic Additively Manufactured Parts (2014)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Additive Manufacturing of metallic components for aerospace applications offers many advantages over traditional manufacturing techniques. As a new technology, many aspects of its widespread utilization remain open to investigation. Among these are the cleaning processes that can be used for post finishing of parts and measurements to verify effectiveness of the cleaning processes. Many cleaning and drying processes and measurement methods that have been used for parts manufactured using conventional techniques are candidates that may be considered for cleaning and verification of additively manufactured parts. Among these are vapor degreasing, ultrasonic immersion and spray cleaning, followed by hot air drying, vacuum baking and solvent displacement drying. Differences in porosity, density, and surface finish of additively manufactured versus conventionally manufactured parts may introduce new considerations in the selection of cleaning and drying processes or the method used to verify their effectiveness. This presentation will review the relative strengths and weaknesses of different candidate cleaning and drying processes as they may apply to additively manufactured metal parts for aerospace applications. An ultrasonic cleaning technique for exploring the cleanability of parts will be presented along with an example using additively manufactured Inconel 718 test specimens to illustrate its use. The data analysis shows that this ultrasonic cleaning approach results in a well-behaved ultrasonic cleaning/extraction behavior. That is, it does not show signs of accelerated cavitation erosion of the base material, which was later confirmed by neutron imaging. In addition, the analysis indicated that complete cleaning would be achieved by ultrasonic immersion cleaning at approximately 5 minutes, which was verified by subsequent cleaning of additional parts.
    Keywords: Mechanical Engineering; Quality Assurance and Reliability
    Type: M14-3711 , JANNAF Additive Manufacturing for Propulsion Applications Technical Interchange Meeting; 3-5 Sept. 2014; Huntsville, AL; United States
    Format: application/pdf
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  • 9
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    Detection of Natural Oil Seeps in the Atlantic Ocean Using MODIS (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Natural oil seepage is the release of crude oil into the ocean from fissures in the seabed. Oil seepage is a major contributor to the total amount of oil entering the world s oceans. According to a 2003 study by the National Academy of Sciences (NAS), 47 percent of oil entering the world s oceans is from natural seeps, and 53 percent is from human sources (extraction, transportation, and consumption). Oil seeps cause smooth oil slicks to form on the water s surface. Oil seeps can indicate the location of stores of fossil fuel beneath the ocean floor. Knowledge of the effect of oil seepage on marine life and marine ecosystems remains limited. In the past, remote sensing has been used to detect oil seeps in the Gulf of Mexico and off of the coast of southern California. This project utilized sun glint MODIS imagery to locate oil slicks off of the Atlantic coast, an area that had not previously been surveyed for natural oil seeps using remote sensing. Since 1982, the Atlantic Ocean has been closed to any oil and gas drilling. Recently, however, the U.S. Minerals Management Services (MMS) has proposed a lease for oil and gas drilling off the coasts of Virginia and North Carolina. Determining the location of seepage sites in the Atlantic Ocean will help MMS locate potential deposits of oil and natural gas, thereby reducing the risk of leasing areas for petroleum extraction that do not contain these natural resources.
    Keywords: Oceanography
    Type: SSTI-2220-0209 , SSTI-2220-0211 , International Symposium on the A-Train Satellite Constellation 2010; Oct 25, 2010 - Oct 28, 2010; New Orleans, LA; United States
    Format: application/pdf
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