Statistical modeling of drill pipes operational life-time under a regular loading

2020 ◽  
pp. 30-33
Author(s):  
V.I. Kucheryavy ◽  
◽  
A.M. Sharygin ◽  
V.L. Savich ◽  
S.N. Milkov ◽  
...  
Keyword(s):  
Statistical Modeling ◽  
Life Time ◽  
Operational Life ◽  
Drill Pipes

Local infiltration devices at parking sites – Experimental assessment of temporal changes in hydraulic and contaminant removal capacity

2007 ◽  
Vol 55 (4) ◽  
pp. 193-200 ◽  
Author(s):  
S. Achleitner ◽  
C. Engelhard ◽  
U. Stegner ◽  
W. Rauch
Keyword(s):  
Mass Balance ◽  
Drainage System ◽  
Life Time ◽  
Point Of View ◽  
Traffic Load ◽  
Worst Case ◽  
Parking Lots ◽  
Removal Capacity ◽  
Operational Life ◽  
Chemical Conditions

On site infiltration of stormwater is a common practice in order to avoid hydraulic overload of the urban drainage system. If hydrological conditions allow on-site infiltration – this is even mandatory from a legal point of view. Focus in this work is on surface infiltration of stormwater from parking lots. Proper operation of those devices is assumed to be appr. 15 years, as permits granted are limited to this time. Questions are raised whether this considered life expectancy is feasible. One apprehension is a possible clogging effect reducing the hydraulic capacity of the swale. The second aim was to identify magnitudes of accumulated pollutant loads with respect to limitations onto lifetime. The experimental investigation covered infiltration swales of different ages from eleven supermarket parking lots in Tyrol. Hydraulic permeabilities were assessed as well as chemical conditions of the soil material regarding hydrocarbon index (HI) and heavy metals (Cu, Zn, Pb and Cd). Further mass balance of contaminants has been performed in order to assess the operational life time based on pollutant load consideration. Calculations were based on load estimations using literature based minima and maxima concentrations from surface flows. Testing the correlation of hydraulic and pollutant measurements against site specific parameters (age, traffic load) revealed no distinct relation. In general all measured pollutants were found under limit concentrations. Mass balance calculations showed that limit concentrations are not exceeded either for worst case loading and considering 15 years of operation.

scholarly journals Design of Distribution Transformer Health Management System using IoT Sensors

2021 ◽  
Vol 3 (3) ◽  
pp. 192-204
Author(s):  
R. Rajesh Sharma
Keyword(s):  
Distribution System ◽  
Distribution Systems ◽  
Health Management ◽  
Life Time ◽  
Distribution Transformer ◽  
Electrical Transmission ◽  
Remote Monitoring System ◽  
Operational Life ◽  
Electricity Power ◽  
Step Down

Transformers are one of the primary device required for an AC (Alternating Current) distribution system which works on the principle of mutual induction without any rotating parts. There are two types of transformers are utilized in the distribution systems namely step up transformer and step down transformer. The step up transformers are need to be placed at some regular distances for reducing the line losses happening over the electrical transmission systems. Similarly the step down transformers are placed near to the destinations for regulating the electricity power for the commercial usage. Certain regular check-ups are must for a distribution transformer for increasing its operational life time. The proposed work is designed to regularize such health check-ups using IoT sensors for making a centralized remote monitoring system.

STATISTICAL MODELING OF A SHAFT’S LIFE-TIME OPERATIONAL PERIOD OF DRILLING PUMPS

2019 ◽  
pp. 24-27
Author(s):  
V.I. Kucheryavy ◽  
◽  
V.L. Savich ◽  
S.N. Milkov ◽  
◽  
...  
Keyword(s):  
Statistical Modeling ◽  
Life Time

Study of a Gamma Radiation Impact on Concrete Properties Under Severe Accident Conditions

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Zbyněk Hlaváč ◽  
Jaroslava Zatloukalová ◽  
Michal Košťál ◽  
Evžen Losa
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Radiation Effects ◽  
Experimental Studies ◽  
Life Time ◽  
Severe Accident ◽  
Research Centre ◽  
Concrete Properties ◽  
60Co Source ◽  
Operational Life

Abstract Concrete is an important structural material used in nuclear power plant (NPP) design. Due to relatively high amount of hydrogen as well as the presence of heavier elements, it also acts as a biological shielding. One of the important tasks for prolongation of operational life time is the determination of concrete components' condition after long-term irradiation. The paper aims to present the current activities in the CV Řež institute (Research Centre Řež—CVR) regarding the investigation of ionizing radiation effects on concrete properties. In its first part, the paper deals with experimental identification of the character of mixed neutron and gamma spectra in the concrete part of the VVER-1000 Mock-Up. Using the knowledge, the radiation field character can be scaled up to the commercial power plants with VVER-1000 light water reactor. It also provides justification for usage of the 60Co source for performed irradiation experiments with concrete. The second part of the article describes the experimental studies of the properties of gamma-irradiated concrete samples by strong 60Co source. This irradiation experiment can be understood as the first step in characterizing concrete degradation as gamma flux in biological shielding is significantly higher than that of neutron flux. In order to better understand the concrete properties and the behavior under irradiation, nondestructive as well as destructive testing methods were applied. We found that after 48 days of irradiation by the 60Co source the sample obtained dose from gamma corresponding to approximately 1% of the total during the NPP lifetime operation. Concrete microstructure degraded and the modulus of elasticity slightly decreased within 5%. Conversely, destruction tests prove significant flexural strength decrease by 27% in case of normal test and by 63% at the loss of coolant accident (LOCA) test.

VVER-440 NPP Reactor Vessel and Reactor Internals Design Review Calculation Using ASME BPVC

2009 ◽  
Author(s):  
Tama´s Pa´lfi ◽  
Pe´ter Pa´lfi ◽  
Sa´ndor Ra´tkai ◽  
Sa´ndor Dancso´
Keyword(s):  
Structural Analysis ◽  
Nuclear Power ◽  
Complex Analysis ◽  
Life Time ◽  
Life Extension ◽  
Division Iii ◽  
Design Review ◽  
Operational Life ◽  
Asme Code ◽  
Design Calculations

Structural analysis of VVER-440 reactors in Paks done in Hungary in the framework of the project for the life time and capacity extension of the nuclear power plant. The main purpose of the calculations is a comprehensive design review of the main components on the base of the internationally accepted ASME BPVC [1] Division III; in order to support the introduction of the ISI methodology required by ASME XI. The new complex analysis creates a gateway between the Russian PNAE [2] and the ASME Code, and reconsiders the scant design calculations. The structural calculations are performed for all the loads and operational cycles of the units taking into account the planned 50 years of operation. The results of the new fatigue calculations are used as TLAA for supporting the technical possibility of the life extension. The newly constructed computation models and the detailed uniform documentation performing as a comprehensive tools to solve further possible structural analysis related issue in the period of extended operational life of the NPP Paks.

scholarly journals Extension of Operational Life-Time of WWER-440/213 Type Units at Paks Nuclear Power Plant

2009 ◽  
Author(s):  
Tama´s Ja´nos Katona ◽  
Sa´ndor Ra´tkai ◽  
A´gnes Ja´nosine´ Bi´ro´
Keyword(s):  
Nuclear Power ◽  
Thermal Power ◽  
Life Time ◽  
Engineering Practice ◽  
Engineering System ◽  
Term Operation ◽  
Operational Life ◽  
License Renewal ◽  
Ageing Management

Operational license of WWER-440/213 units at Paks NPP, Hungary is limited to the design lifetime of 30 years. Prolongation by additional 20 years of the operational lifetime is feasible. Moreover, enhancement of the reactor thermal power by 8% will increase both the net power output and the competitiveness of the plant. Paks NPP is one of the first considering the power up-rate and preparation of long-term operation of WWER-440/213 design. Systematic preparatory work for long-term operation of Paks NPP has been started in 2000. A regulatory framework and a comprehensive engineering practice have been developed. According to the authors view, creation of a gapless engineering system via consequent application of best practices, and feed-back of experiences together with proper consideration of WWER-440/V213 features are the decisive elements of ensuring the safety of long-term operation. That systematic engineering approach is in the focus of recent paper. Key elements of justification and measures and actions for ensuring the safety of long-term operation of Paks NPP WWER-440/213 units are identified and discussed. These are the assessment of plant condition and review of adequacy of ageing management programmes, also the review, validation and reconstitution of time limited ageing analyses as core tasks of license renewal.

Diphenylphosphin-substituiertes, chirales Polyepichlorhydrin, ein Träger für die heterogene, asymmetrische Katalyse / Diphenylphosphine-Substituted, Chiral Polyepichlorohydrin, a Support for the Heterogeneous, Asymmetric Catalysis

1993 ◽  
Vol 48 (11) ◽  
pp. 1589-1594 ◽  
Author(s):  
H. P. Fritz ◽  
J. Blümel ◽  
D. Dengler
Keyword(s):  
Asymmetric Catalysis ◽  
Life Time ◽  
Optically Active ◽  
Side Group ◽  
Subsequent Reaction ◽  
Operational Life ◽  
Rhodium Atom ◽  
Insoluble Polymer ◽  
Heterogeneous Asymmetric Catalysis ◽  
Cp Mas Nmr

Chiral polyepichlorohydrin was obtained as a crystalline, optically active powder by coordinative polymerization of S(+)-epichlorohydrin. Subsequent reaction with lithium diphenylphosphide in THF resulted in substitution of about 90% of the chlorine atoms by the P(C6H5)2 group to give an insoluble polymer, which was characterized by elemental analysis, 31P CP MAS NMR, and IR spectroscopy. On addition of solutions of bis(1.5-cyclooctadiene)-rhodium tetrafluoroborate to the polymer “heterogenization” of the complex occurred. The reason for the as yet short operational life time during the hydrogenation of α-acetamido cinnamic acid is the leaching of the metal complex moiety. The rhodium atom is coordinated to only one phosphorus atom of the polymer in the side group and rather weakly to one oxygen atom of the polymer chain.

Process Development and Die Shear Testing in MOEMS Packaging

2007 ◽  
Author(s):  
Nikhil Lakhkar ◽  
Abiodun Fasoro ◽  
Amit Patil ◽  
Woo Ho Lee ◽  
Dan Popa ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Process Development ◽  
Critical Path ◽  
Life Time ◽  
Mems Devices ◽  
Optical Mems ◽  
Mems Packaging ◽  
Die Attach ◽  
Data Rates ◽  
Operational Life

Micro-Opto-electro-Mechanical Systems (MOEMS), which are MEMS integrated with photonics, share the traditional challenges of MEMS packaging with the additional issues of optical interconnects and optical surface contamination. Optoelectronic systems require signals through a package using fiber-optics, coaxial or other interconnection approaches. Precise optical component alignment and accurate thermal management is critical to achieve component and system performance capabilities. As the requirements for higher signal speeds and higher data rates grow, and as operating frequencies move to the higher GHz regions and beyond, the choice of packaging technology becomes critical. Optical MEMS packages not only have to provide electrical connections but also support high precision optics and mechanics, vital for operation of optical MEMS devices. Analogous to MEMS, packaging is also a critical path in reliability and cost of MOEMS devices. One of the commonly observed failures is the de-lamination between the chip (die) and the die attach. The focus of this paper is the development of a reliable fluxless die attachment process suitable for MOEMS assemblies with long operational life time. The reliability assessment was carried out at the Texas Microfactory™ at UT Arlington according to the MIL-STD-883F for die shear reliability.

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