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

2019 ◽  
Vol 20 ◽  
pp. 306-309
Author(s):  
G.S Ammosov ◽  
M.P. Lebedev
Keyword(s):  
Service Life ◽  
Weld Metal ◽  
The North ◽  
Steel Tank

scholarly journals Application of Hard Metal Weld Deposit in the Area of Mixing Organic Materials

2014 ◽  
Vol 62 (5) ◽  
pp. 1161-1169 ◽  
Author(s):  
Jiří Votava ◽  
Vojtěch Kumbár
Keyword(s):  
Service Life ◽  
Weld Metal ◽  
Machine Part ◽  
Base Material ◽  
Hard Metal ◽  
Weld Bead ◽  
Similar Process ◽  
Metal Electrodes ◽  
Weld Deposit ◽  
Metal Weld

Any machine part is subject to degradation processes. Intensive wear occurs either when two bearing surfaces come into contact or when loose particles rub the function surface of a machine part. Soil processing machines are a good example. A similar process of abrasive wear occurs also in mixing machines or lines for material transport, such as worm-conveyors. The experiment part of this paper analyses hard metal weld deposit dedicated for renovation of abrasive stressed surfaces. In order to prolong the service life of a blade disc in a mixing machine Kreis-Biogas-Dissolver, the technology of hard surfacing by an electric arc was used. Tested hard metal electrodes were applied on a steel tape class 11 373. To eliminate mixing with the base material, weld beads were applied in two layers. Firstly, the weld bead was visually analyzed on a binocular microscope. Further, weld bead as well as the base material was analyzed from the metallographic point of view, whose aim was to identify the structure of weld metal and the origin of microcracks in weld bead. Moreover, there was also measured microhardness of weld metal. Abrasive resistance was tested according to the norm ČSN 01 5084, which is an abrasive cloth test. As in the mixing process also erosion wear occurs, there was also processed a test on a Bond device simulating stress of test samples by loose abrasive particles. The abrading agents were formed by broken stones of 8–16 mm in size. Based on the results of the individual tests, the recommendation of usage hard metal electrodes for prolonging service life of machine parts will be made.

The Dynamics of Impacts Tools the Loading Boom Bucket Wheel Excavators

2014 ◽  
Vol 683 ◽  
pp. 213-218 ◽  
Author(s):  
Horst Gondek ◽  
Jiří Neruda ◽  
Jiří Pokorný
Keyword(s):  
Service Life ◽  
Belt Conveyor ◽  
Long Distance ◽  
The North ◽  
Conveyor Belts ◽  
New Type ◽  
The Impact

One of the major problems of long-distance belt conveyor technology, and not only in the North Bohemian mines, are impacts of rock blocks on the belts which increases the belts wear and reduces their service life. Therefore, in this paper there are widely discussed the rock impacts dynamics, a new type of device - the impact rods intended for significant reducing the number of punctures in the conveyor belts and thus for prolongation of their service life and modeling of the proposed devices. Application of the impact rods is estimated in the impact stands of the systems of conveyors removing the coal extracted by the bucket wheel excavator KU 300.

scholarly journals On the chronology of the Late Pre-Roman Iron Age in eastern Germania in the light of selected types of brooches

2020 ◽  
Vol 72 (2) ◽  
pp. 238-259
Author(s):  
Piotr Łuczkiewicz
Keyword(s):  
Service Life ◽  
Iron Age ◽  
Carpathian Mountains ◽  
Central Poland ◽  
The Carpathians ◽  
The North ◽  
Baltic Coast ◽  
Przeworsk Culture ◽  
La Tene ◽  
The Baltic

On the basis of selected types of supra-regional brooches (A.65, Nauheim, Schüsselfibeln, A.18), an attempt was made to check whether they appeared in the eastern part of Germania in the same chronological rhythm as in their home zones. The service life of A.65 brooch and post-oppidial forms A.18 north of the Carpathians corresponds to the chronology in the primary distribution zone, no significant differences can be seen. Another picture – obtained, however, from a small number of finds – is drawn for Nauheim type brooches, which seem to remain in use a little longer in the zone between the Carpathian Mountains and the Baltic coast, until the younger stage of the LT D2 phase. Similarly, bowl-shaped brooches (Schüsselfibeln), probably made mostly in local workshops, were worn in the north for several decades longer than in the zone south of the Carpathian Mountains. In Pomerania they came into use probably slightly earlier than in the area of Przeworsk culture and probably went out of fashion a little faster. This indicates a slightly different rhythm of stylistic and fashion changes between southern and central Poland (Przeworsk culture) and the north – the region of the lower Vistula and the Gulf of Gdańsk. Late La Tène period – Late Pre-Roman Iron Age – chronology – brooches – Przeworsk culture – imports

scholarly journals Studying deformation of support horizontal steel tank when performing a frequency analysis

2019 ◽  
pp. 120-126
Author(s):  
Alexander V. Solodovnikov ◽  
Arina N. Makhneva
Keyword(s):  
Frequency Analysis ◽  
Support Structure ◽  
The North ◽  
Steel Tank

The article is devoted to the study of deformation of support structure of horizontal steel tank, which is located in the North of Tyumen region. This study was carried when performing frequency analysis. It is found that the hardness ring was great deformation when performing frequency analysis of support structure of horizontal steel tank. The support structure of tank has lost its balance, but retained its integrity.

Reliability-Based Design and Assessment for Lifetime Extension of Ageing Offshore Structures

2016 ◽  
Author(s):  
E. Mat Soom ◽  
M. K. Abu Husain ◽  
N. I. Mohd Zaki ◽  
N. U. Azman ◽  
G. Najafian
Keyword(s):  
Service Life ◽  
Offshore Structures ◽  
Risk Level ◽  
Type I ◽  
Offshore Structure ◽  
Design Assessment ◽  
Reliability Based Design ◽  
Remaining Service Life ◽  
The North ◽  
Cost Efficient

The methodology for Reliability-Based Design and Assessment (RBDA) of an ageing fixed steel offshore structure was established to support detailed re-assessment applied to the management of the structure’s safety, integrity analysis and reliability by evaluating the loading acting on the structure. It is a tool for the high-end analysis of the structure for risk-based design assessment and has been succesfully implemented in the North Sea under Shell operating company. The main purposes of RBDA are to manage a structure’s risk level over its remaining service life and to initiate the cost-efficient inspection or mitigation actions (if required). This method consists of Type I and II uncertainties used to determine the probability of failure for the structure over its remaining service life. However, limited work has been done so far on its application at many different regions, particularly in the South East Asia. Therefore, this paper investigates the robustness of the RBDA methodology applied to fixed offshore structures at shallow waters of Malaysia by considering the native environmental criteria, local authorities’ obligation and company requirements. It is shown that this procedure can efficiently assist in understanding the structure’s failure mechanism and correctly define the relevant type of mitigations required.

Analysis of Flow Induced Vibrations Effect on Service Life of Unbonded Flexible Pipe

2004 ◽  
Author(s):  
Zhimin Tan ◽  
Andrew Ethridge ◽  
Terry Sheldrake ◽  
Richard Clements
Keyword(s):  
Service Life ◽  
Internal Flow ◽  
Analytical Models ◽  
Flexible Pipe ◽  
The North ◽  
Axial Tension ◽  
Flexible Pipes ◽  
Flow Induced Vibrations ◽  
The North Sea ◽  
Flow Vortex

High frequency vibrations have been reported on flexible pipes for gas export risers installed on platforms offshore in the North Sea. The vibrations are believed to be caused by internal flow vortex shedding as pressured gas passes through the bore at a certain speed. The vibration frequency is typically above 150Hz resulting in approximately 100 billion cycles over the service life. This paper presents analytical models developed to assess the alternating stresses of the strength components induced by the flow-induced carcass vibration, and the consequent influence over their fatigue damage and overall pipe structure integrity. The studied strength layers include the interlocked carcass layer, interlocked hoop strength (pressure armor) and axial tension layers. The models illustrate the behavior of these components inside both the end fitting structure and the free suspended section. The study of a large 15 inch inner diameter gas export riser is presented with test measurements reported in literature.

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