Application of a base reinforced with a horizontal geosynthetic layer for the foundation of a steel tank

Ice formation under controlled conditions was studied in a cold room using a cylindrical steel tank 120 cm in diameter and 76 cm deep. Paddles turned by a variable speed motor moved the water about the axis of the tank. Twenty-one thermistors were used to record temperatures above and below the surface of the water. Ice was allowed to form with the cold room temperature held at −2 °C, −5 °C, −10 °C, and −20 °C and with water speeds (measured 4 cm from the tank wall) from 0 to 73 cm/s.At zero water speed ice formed first as needles randomly oriented over the surface. With flowing water, border ice width increased linearly with time, but independently of water speed. The rate of increase of the border width w fits the equation dw/dt = (4/9)|Ta|0.68 where Ta is the Celsius air temperature.Frazil was never observed at water speeds less than 24 cm/s, but was always formed at this or greater speeds, regardless of cold room temperature. The volume of slush accumulated was greater at greater water speeds and at colder air temperatures. Observed slush volumes are compared with semiempirical values of the ice mass obtained from theoretical equations. The data suggest that growth of ice crystals began when the water was supercooled by approximately 0.02 °C.

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Fast and Reliable Multiresidue Analysis of Aromas in Wine by Means of Gas Chromatography Coupled with Triple Quadrupole Mass Spectrometry

Analytica ◽

10.3390/analytica2020005 ◽

2021 ◽

Vol 2 (2) ◽

pp. 38-49

Author(s):

Ettore Guerriero ◽

Massimo Iorizzo ◽

Marina Cerasa ◽

Ivan Notardonato ◽

Bruno Testa ◽

...

Keyword(s):

Direct Injection ◽

Headspace Analysis ◽

White Wine ◽

Quadrupole Mass ◽

Multiresidue Analysis ◽

Liquid Liquid Extraction ◽

Volatile Organic ◽

Steel Tank ◽

First Time

The paper would like to show a direct injection into GC-MS/QqQ for the determination of secondary aromas in white wine samples fermented in two different ways. The procedure has been compared with more traditional methods used in this field, i.e., headspace analysis and liquid–liquid extraction. The application of such direct injection, for the first time in the literature, allows us to analyze Volatile Organic Compounds (VOCs) in the range 0.1–100 µg mL−1, with Limits of Detection (LODs) and Limits of Quantification (LOQs) between 0.01–0.05 µg mL−1 and 0.03–0.09 µg mL−1, respectively, intraday and interday below 5.6% and 8.5%, respectively, and recoveries above 92% at two different fortification levels. The procedure has been applied to real wine samples: it evidences how the fermentation in wood (cherry) barrel yields higher VOC levels than ones in wine fermented in steel tank, causing production of different secondary aromas and different relative flavors.

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Determination of the region of the limiting states occurrence in RVS-20000 with the subsidence of the external bottom contour

MATEC Web of Conferences ◽

10.1051/matecconf/201823906002 ◽

2018 ◽

Vol 239 ◽

pp. 06002

Author(s):

P.V. Chepur ◽

A.A. Tarasenko ◽

A.A. Gruchenkova

Keyword(s):

Technical Condition ◽

Element Analysis ◽

Metal Structures ◽

Software Complex ◽

Managerial Decisions ◽

The Finite Element Analysis ◽

Steel Tank ◽

Intrinsic Stiffness ◽

Bottom Contour

The problem of the limiting states occurrence in the structures of a vertical steel tank is investigated in this work. To study the SSS of the metal structures of the object, the authors created a numerical model of the RVS-20000 tank in the ANSYS software complex. The model considers the maximum number of elements with their geometry and connections affecting the tank SSS under non-axisymmetric loading, including beyond the elasticity of steel. Dependences between the parameters of intrinsic stiffness of the VST are obtained. The results of the finite element analysis made it possible to develop a technique for assessing the technical condition of the structure with the development of irregular subsidence of the external bottom contour. The proposed technique can be used by both operating and design organizations in making managerial decisions regarding the repair of RVS-20000 subjected to the base subsidence.

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Influence of the volume of deposited weld metal on the service life of the vertical steel tank in the North

Procedia Structural Integrity ◽

10.1016/j.prostr.2019.12.156 ◽

2019 ◽

Vol 20 ◽

pp. 306-309

Author(s):

G.S Ammosov ◽

M.P. Lebedev

Keyword(s):

Service Life ◽

Weld Metal ◽

The North ◽

Steel Tank

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Microstructure and superconducting properties of attrition-milled Bi2Sr2CaCu2Ox

Journal of Materials Research ◽

10.1557/jmr.1994.0297 ◽

1994 ◽

Vol 9 (2) ◽

pp. 297-304 ◽

Cited By ~ 11

Author(s):

J.S. Luo ◽

H.G. Lee ◽

S.N. Sinha

Keyword(s):

Electron Microscopy ◽

Milled Powder ◽

High Energy ◽

Double Layers ◽

Superconducting Transition ◽

Superconducting Properties ◽

X Ray Diffraction ◽

Transmission Electron ◽

Steel Tank ◽

Practical Implications

The microstructure and superconducting properties of Bi2Sr2CaCu2Ox (Bi-2212) during high-energy attrition milling were investigated in detail by a combination of x-ray diffraction, scanning electron microscopy, transmission electron microscopy, and magnetization techniques. The starting superconducting powder was milled in a standard laboratory attritor using yttria-stabilized ZrO2 balls and a stainless steel tank. After selected time increments, the milling was interrupted and a small quantity of milled powder was removed for further analysis. It was found that the deformation process rapidly refines Bi-2212 into nanometer-size crystallites, increases atomic-level strains, and changes the plate-like morphology of Bi-2212 to granular submicron clusters. At short milling times, the deformation seems localized at weakly linked Bi-O double layers, leading to twist/cleavage fractures along the {001} planes. The Bi-2212 phase decomposes into several bismuth-based oxides and an amorphous phase after excessive deformation. The superconducting transition is depressed by about 10 K in the early stages of milling and completely vanishes upon prolonged deformation. A deformation mechanism is proposed and correlated with the evolution of superconducting properties. The practical implications of these results are presented and discussed.

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Cracking Response of a Concrete Wall to Cryogenic Temperature

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.365.71 ◽

2015 ◽

Vol 365 ◽

pp. 71-76

Author(s):

Lahlou Dahmani ◽

Rabah Hammar ◽

Mohamed Oussalem Mechiche

Keyword(s):

Cryogenic Temperature ◽

Heat Conduction Problem ◽

Outer Wall ◽

Distribution Data ◽

Cryogenic Temperatures ◽

The Finite Element Method ◽

Ansys Software ◽

Concrete Wall ◽

Steel Tank ◽

Concrete Tank

Liquefied natural gas (LNG) has the cryogenic temperature of –160°C to ensure the minimum storage volume when stored in LNG containers. Among various types of LNG storage containers, the full containment above-ground type with a double safety system (outer concrete tank and inner steel tank) is very common. Normally, the inner tank contains LNG, but when the LNG leaks from the inner tank, the outer concrete tank comes into contact with LNG. Under this accidental case, it is indispensable for the outer wall to keep the liquid tightness in order to safely contain the LNG before taking any countermeasure. It is, therefore, proposed to take up a heat conduction problem using the finite element method with the ANSYS software to obtain temperature distribution data of a concrete wall at cryogenic temperatures.

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Differentiate low impedance media in closed steel tank using ultrasonic wave tunneling

Ultrasonics ◽

10.1016/j.ultras.2017.07.018 ◽

2018 ◽

Vol 82 ◽

pp. 130-133 ◽

Cited By ~ 1

Author(s):

Chunying Wang ◽

Zhaojiang Chen ◽

Wenwu Cao

Keyword(s):

Ultrasonic Wave ◽

Steel Tank ◽

Closed Steel

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