Long-term artificially aging process and vibration analysis of pipes

2012 ◽  
Vol 3 (1) ◽  
pp. 15-19
Author(s):  
D. Kocsis ◽  
R. Horváth ◽  
S. Manó ◽  
Z. A. Godó
Keyword(s):  
Vibration Analysis ◽  
Aging Process ◽  
Experimental System ◽  
Measuring Instruments ◽  
Engineering Society ◽  
Aging Test ◽  
Vibration Tests ◽  
Property Changes ◽  
Pipe Materials

Abstract The identification of property changes and damage in various structures is one of the major points in the engineering society. This work contains the method and results of a long-term aging process implemented by an experimental system. We applied a chemical and heat artificial aging test on metal and plastic pipes to indicate the degradation levels and results with suitable measuring instruments. During our measurements of aged pipes vibration tests were performed to get information about the changing of the vibration spreading properties of different materials. We were searching for information about the property changing of widely used pipe materials to estimate the rate of degradation and the service life of these instruments more accurately.

The Prediction of Long-Term and Emergency Sealability of Silicone and EPDM Gaskets

2010 ◽  
Author(s):  
Mitsuyuki Nakano ◽  
Haruko Sasaki ◽  
Kanji Hanashima
Keyword(s):  
Power Plant ◽  
Silicone Rubber ◽  
Nuclear Power ◽  
Physical Property ◽  
Rubber Gasket ◽  
Long Term Stability ◽  
Containment Vessel ◽  
Aging Test ◽  
Property Changes

At nuclear power plants, containment vessel acts as pressure barrier in such an emergency as a loss-of-coolant accident. It is important as safety equipment to prevent radiological from leaking outside. Rubber gaskets, which are used for sealing faces of containment vessel, are needed to maintain certain sealability not only in stable condition but also in an emergent situation. Among important characteristics of the rubber gasket are not only physical property changes after general aging test (for example, tensile strength changes after heat resistance test) that indicate long-term stability of gasket itself, but also after radiation resistance test which gives potential to good substitute characteristic in terms of sealability in such cases. Physical property changes after general aging test do not always substitute sealability in an emergency, because they do not reflect effects of radiation. That is why nuclear power plant engineers must choose suitable rubber materials that have high performance in radiation resistance. In Japan, silicone rubber gaskets have been used for containment vessel for a long time since 1970th, but in the United States, ethylene propylene diene terpolymer (EPDM) gaskets have been widely used. NICHIAS has silicone rubber and EPDM materials for containment vessel and these gaskets have been used in nuclear power plant. But it is not obvious why different materials have been used in two countries because few relative comparisons of the two materials have been carried out. Especially silicone rubber and EPDM gaskets have many combinations of chemical compositions, so it is difficult to evaluate gasket suitability for containment vessel. There are many kinds of studies concerning long-term stability and life of gasket, but we all must know what characteristics relate sealability under radiation exposure condition and are suitable for guidepost of sealability under previous condition. This report compares silicone rubber gasket with EPDM gasket on physical property changes under irradiation and thermal treatment. We report compression set test results about one each type of silicone rubber and EPDM gasket under irradiation from Co60. And we also report relationships in physical property changes between irradiation and thermal treatment. Finally NICHIAS predicts long-term and emergency sealability of these gaskets from the results of evaluation. We hope it will be a part of design guideline of rubber gasket for containment vessel.

scholarly journals Changes in surface characteristics and adsorption properties of 2,4,6-trichlorophenol following Fenton-like aging of biochar

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Liqiang Cui ◽  
Qinya Fan ◽  
Jianxiong Sun ◽  
Guixiang Quan ◽  
Jinlong Yan ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Surface Properties ◽  
Aging Process ◽  
Surface Characteristics ◽  
Natural Soil ◽  
Peanut Shell ◽  
Soil Environment ◽  
Polluted Soils ◽  
Physico Chemical

AbstractFenton-like system formed in a natural soil environment deemed to be significant in the aging process of biochar. Aged biochars have distinct physico-chemical and surface properties compared to non-aged biochar. The aged biochar proved to be useful soil amendment due to its improved elements contents and surface properties. The biochar aging process resulted in increased surface area and pore volume, as well as carbon and oxygen-containing functional groups (such as C=O, –COOH, O–C=O etc.) on its surface, which were also associated with the adsorption behavior of 2,4,6-trichlorophenol (2,4,6-TCP). The biochar aging increased the adsorption capacity of 2,4,6-TCP, which was maximum at pH 3.0. The 2,4,6-TCP adsorption capacity of aged-bush biochar (ABB) and aged-peanut shell biochar (APB) was increased by 1.0–11.0% and 7.4–38.8%, respectively compared with bush biochar (BB) and peanut shell biochar (PB) at the same initial concentration of 2,4,6-TCP. All biochars had similar 2,4,6-TCP desorption rates ranging from 33.2 to 73.3% at different sorption temperatures and times. The desorbed components were mainly 2,4,6-TCP and other degraded components, which were low in concentration with small molecule substance. The results indicated that the aged-biochar could be effective for the long-term remediation of naturally organic polluted soils.

Hardening of Aged Duplex Stainless Steels by Spinodal Decomposition

2004 ◽  
Vol 10 (3) ◽  
pp. 349-354 ◽  
Author(s):  
F. Danoix ◽  
P. Auger ◽  
D. Blavette
Keyword(s):  
Mechanical Properties ◽  
Impact Toughness ◽  
Spinodal Decomposition ◽  
Stainless Steels ◽  
Aging Process ◽  
Atom Probe ◽  
Duplex Stainless Steels ◽  
Detailed Knowledge ◽  
Iron Chromium

Mechanical properties, such as hardness and impact toughness, of ferrite-containing stainless steels are greatly affected by long-term aging at intermediate temperatures. It is known that the α-α′ spinodal decomposition occurring in the iron–chromium-based ferrite is responsible for this aging susceptibility. This decomposition can be characterized unambiguously by atom probe analysis, allowing comparison both with the existing theories of spinodal decomposition and the evolution of some mechanical properties. It is then possible to predict the evolution of hardness of industrial components during service, based on the detailed knowledge of the involved aging process.

scholarly journals Supersonic oscillation impact upon aging process of different metal alloys

2020 ◽  
Vol 2020 (2) ◽  
pp. 10-15
Author(s):  
Vladimir Alexandrov ◽  
Boris Kudryashov ◽  
Kirill Ivanov ◽  
Viktor Vdovin
Keyword(s):  
Aging Process ◽  
Metal Alloys ◽  
Stress Strain ◽  
Strain Property ◽  
Property Changes

A short literary review on the super-sound impact upon different alloy aging is shown. The super-sound impact upon aging processes martensite alloys is considered. A super-sonic plant allowing increasing a super-sound impact upon martensite steel aging is developed. There are shown the investigation results of frequency and intensity of sound oscillation upon stress-strain property changes in aging processes.

scholarly journals Long-term stability analysis and its relationship with the steel structure of gauge blocks from several manufacturers

2021 ◽  
Vol 1193 (1) ◽  
pp. 012077
Author(s):  
A Mínguez ◽  
J Moreno ◽  
J De Vicente
Keyword(s):  
Stability Analysis ◽  
Statistical Method ◽  
Dimensional Stability ◽  
Steel Structure ◽  
Metallographic Analysis ◽  
Measuring Instruments ◽  
Dimensional Metrology ◽  
Long Term Stability ◽  
History Of

Abstract Gauge blocks are one of the most widespread measurement standards (etalons) in dimensional metrology laboratories. Among all its properties, it is worth highlighting the importance of dimensional stability. This property allows to classify these measuring instruments in quality grades. Although the gauge blocks should be dimensionally stable, it can be observed that there is a drift that can be observed when the calibration history is revised. In this document, authors present a statistical method for the estimation of the dimensional stability of gauge blocks using the calibration history of samples from the main manufacturers. In addition, all the samples have been subjected to metallographic analysis to evaluate the structure.

Aging in Place

2018 ◽  
pp. 259-276 ◽  
Author(s):  
Ben Yuk Fai Fong ◽  
Vincent T. Law
Keyword(s):  
Social Networks ◽  
Aging Process ◽  
Local Community ◽  
Long Term Care ◽  
Aging In Place ◽  
Social Psychological ◽  
Term Care ◽  
Residential Homes ◽  
The Social

Aging is a function of time and is a natural and integral part of the life cycle. Aging process differs among individuals and brings all kinds of changes, affecting not just the physical body and its functions, but also to the social, psychological and financial situations to individuals. Aging in place (AIP) is a common preference among older people for remaining in their local community and maintaining their social networks throughout the aging process. Issues about appropriateness of aging in place, long-term care, and residential homes are discussed. Some models and recommendations are discussed, completed with thoughts on future studies.

Microplastics act as vectors for antibiotic resistance genes in landfill leachate: The enhanced roles of the long-term aging process

2021 ◽  
Vol 270 ◽  
pp. 116278
Author(s):  
Yinglong Su ◽  
Zhongjian Zhang ◽  
Jundong Zhu ◽  
Jianhong Shi ◽  
Huawei Wei ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
Resistance Genes ◽  
Landfill Leachate ◽  
Aging Process ◽  
Antibiotic Resistance Genes

Guidelines for Repair Welding of Pressure Equipment in Refineries and Chemical Plants: Part 2—Repair Welding Method

2011 ◽  
Author(s):  
Keisuke Shiga ◽  
Yukio Hirai ◽  
Ogayu Yasushi
Keyword(s):  
Chemical Plant ◽  
Chemical Plants ◽  
Safe Operation ◽  
Research Committee ◽  
Repair Welding ◽  
Welding Method ◽  
Engineering Society

It has been recognized that repair welding plays an important role of in the long term, safe operation of pressure equipment. In 2009, the Japan Welding Engineering Society (JWES) published guidelines for repair welding of pressure equipment, to meet the great need for the safe operation and proper maintenance of aging plants. This paper gives brief descriptions of three types of repair welding method, “Flaw excavation and repair welding”, “Butt-welded insert plates”, and “External fillet welded patches”, which welding methods are based on Chemical Plant Welding Research Committee of JWES.

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