Download or read book Ignition of Aluminum by Impact in LOX Influence of Contaminants written by D. Roy and published by . This book was released on 2000 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Impact tests in LOX according to ASTM D 2512 were conducted on thin aluminum films (7 to 20 ?m) together with glass fibers films used for the super insulation of vacuum insulated cryogenic vessels. Influence of the film thickness, type of material and number of layers were investigated. Practical information is given concerning the requirements for such insulation.
Download or read book Ignition of Contaminated Aluminum by Impact in Liquid Oxygen Influence of Oxygen Purity written by Etienne Werlen and published by . This book was released on 2009 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Impact tests in liquid oxygen and oxygen enriched liquids have been conducted on aluminum foils (0.2 mm thick) used for heat exchangers of air separation units (ASUs). Some adaptations to the ASTM Standard D2512, "Standard Test Method for Compatibility of Materials with Liquid Oxygen," have been done to ensure the good control of oxygen content in the cryogenic liquid and to get reproducible results in aluminum ignition with hydrocarbon coating. Modified striker pins with a cavity on the contact surface have been used. The vertical guiding and the centering of the striker pins have been ensured by using two machined guides. Test samples were three layers of aluminum foil, two corrugated and one flat, contaminated by various quantities of hexadecane. The criteria for the identification of aluminum ignition (positive tests) have been validated by performing Scanning electron microscope surface analysis on residuals of a few impact tests performed in copper cups. Criteria have also been defined to check that hexadecane combustion took place in negative tests. A sufficient number of tests have been performed to plot the probability of ignition of the aluminum samples as a function of the average thickness of hexadecane coating and as a function of the oxygen content in the cryogenic liquid varying from 50 % to above 99.95 %. The remaining part in the cryogenic liquid was nitrogen and 2.3 % argon except for one series of tests where the influence of the absence of argon could be identified. The results of these tests can be used to assess the risk of ignition of some aluminum exchangers or structures used in ASU.
Download or read book Flammability and Sensitivity of Materials in Oxygen enriched Atmospheres written by B. E. Newton and published by ASTM International. This book was released on 2003 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flammability and Sensitivity of Materials in Oxygen enriched Atmospheres written by David B. Hirsch and published by ASTM International. This book was released on 2006 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flammability and Sensitivity of Materials in Oxygen enriched Atmospheres written by Joel M. Stoltzfus and published by ASTM International. This book was released on 1993 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flammability and Sensitivity of Materials in Oxygen Enriched Atmospheres written by and published by ASTM International. This book was released on 1983 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ignition Testing by Fracture of Oil and Particle Contaminated Aluminum Pipes in High Pressure Oxygen at Ambient and Elevated Temperature written by Matthias Meilinger and published by . This book was released on 2012 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminum and its alloys are the preferred material in air separation units (ASUs) and are submitted to strict cleanliness requirements to avoid combustion reactions in oxygen. Linde Engineering Division has investigated the role of particle contamination for the ignition of aluminum pipes in high pressure oxygen. Tests were carried out with oil coated aluminum pipes in combination with a particle contamination. Accumulations of following particle types were tested: molecular sieve 13X, filter deposits (rust), perlite, quartz sand, and aluminum swarf. The contaminated pipes were pressurized with oxygen up to 150 bar and fractured in a hydraulic apparatus. The conditions and probability of an ignition reaction compared with oiled pipes without particles were of interest. Additionally, similar high pressure tests with a mixture of liquid and gaseous oxygen were performed. A combination of oil and particles enhanced the probability of an ignition at elevated temperatures. The results indicated that temperature is the dominating factor for an oil ignition, not the oxygen pressure. At room temperature, an oil/aluminum ignition could never be initiated. The results give a good understanding regarding the mechanism of an aluminum ignition and help to clarify causes of damage in the ASU industry.
Download or read book Flammability and Sensitivity of Materials in Oxygen enriched Atmospheres written by Ting C. Chou and published by ASTM International. This book was released on 1997 with total page 491 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Report written by and published by . This book was released on 1963 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reactivity of Titanium with Oxygen written by W. A. Riehl and published by . This book was released on 1963 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was undertaken to develop information on which a knowledgeable decision could be based concerning the use of titanium for construction of thin walled LOX tanks. The primary goals were to investigate the reactions of titanium alloys with oxygen under a variety of conditions associated with space vehicles, and to determine if the titanium could be treated or coated in some fashion to eliminate such hazards.
Download or read book Ignition of Contaminants by Impact of High Pressure Oxygen written by L. Bamford and published by . This book was released on 1988 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ignition of hydrocarbon-based oil films by the impact of high-pressure oxygen has been studied as part of an evaluation of cleanliness requirements for oxygen systems. Stainless steel lines contaminated on the inside surface with known quantities of oil were closed at one end, attached to a high-pressure (52 MPa) oxygen system, and pressurized by opening a high-speed valve. Ignition of the oil films was detected by a photocell attached to the closed end of the line.
Download or read book Safe Use of Oxygen and Oxygen Systems written by and published by ASTM International. This book was released on with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Promoted Ignition Combustion Behavior of Tubular Aluminum Samples in Liquid and Gaseous Oxygen Environments written by R. Zawierucha and published by . This book was released on 2003 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Past literature has reported on the occurrence of violent energy releases (VER) involving either high surface area aluminum structured packing or brazed aluminum heat exchanger (BAHX) samples subjected to promoted ignition-combustion testing in liquid oxygen (LOX) environments. In each of these situations, both the aluminum packing samples and the BAHX specimens contained relatively thin sections of aluminum. The aluminum thickness ranged from 0.2 to 0.25 mm for the aluminum packing and the fin portion of "thin fin" BAHXs. Other "thick fin" BAHXs tested had nominal fin thicknesses ranging from 0.41 mm to 0.46 mm. Similar flammability data have not been reported for thick wall (4.1 mm), 3003 tubular aluminum heat exchanger material which may be used in LOX applications. The impetus for this program was to study the promoted-ignition combustion behavior of thick wall, tubular aluminum samples in various LOX environments using both a localized hydrocarbon promoter and uniformly dispersed hydrocarbon film. Tests were also conducted in various gaseous oxygen (GOX) environments using uniformly dispersed hydrocarbon films.
Download or read book Surface Ignition of Aluminum in Oxygen written by B. Newton and published by . This book was released on 2006 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published reports of burning aluminum in oxygen using ASTM G 124-type testing demonstrated that aluminum alloys are difficult to ignite but once ignited are extremely flammable in terms of regression rate and energy release. The ignition resistance of aluminum is associated with its tenacious and protective oxide, which allows aluminum to safely contain high-pressure oxygen in certain applications. The ignitability of aluminum varies between alloys and surface treatments so a test method was developed to evaluate the ignitability of various aluminum surfaces. The test method uses a promoted ignition chamber consistent with ASTM G 124 testing; however, the test sample is configured in the shape of a coupon. Instead of promoting the sample with an electrically heated wire, a controlled electrical arc is generated by drawing an electrode away from the center of the coupon while passing current through the sample. The level of energy applied to the surface of the coupon is semi-quantifiable and kept constant between tests. Based on this semi-quantifiable amount of energy, an ignition pressure is established and the influence of alloy composition and surface treatments on aluminum is evaluated.
Download or read book NASA Scientific and Technical Reports written by United States. National Aeronautics and Space Administration Scientific and Technical Information Division and published by . This book was released on 1966 with total page 1440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Materials Compatibility and Contamination Control Processes written by Society of Aerospace Material and Process Engineers. Symposium. 4th, Hollywood, Calif., 1962 and published by . This book was released on 1962 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
