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Untersuchung eines LNG-Kompensators im kryogenen Bereich
Citation Link: https://doi.org/10.15480/882.3529
Publikationstyp
Master Thesis
Date Issued
2020-08
Sprache
German
Author(s)
Advisor
Title Granting Institution
Technische Universität Hamburg
Place of Title Granting Institution
Hamburg
Examination Date
2020-08
TORE-DOI
TORE-URI
Citation
Technische Universität Hamburg (2020)
In shipping, engines powered by heavy fuel cause high level of climate effecting emmissions. LNG is therefore considered as an alternative to heavy fuel, as combustion of LNG will result in a significant reduction in emissions.
This thesis examines the potential use and its feasibility for use of a LNG expansion joint in ships.
For this purpose, an expansion joint is tested in a climate chamber to determine its behaviour. In this experiment, the expansion joint is cooled down with liquid nitrogen down to -160 °C in order to measure the force and strain on the expansion joint.
The experiment is then simulated with a FE-analysis, whereby a stress analysis is also carried out using FEM.
The last step of the verification of the usability of expansion joints in the LNG sector is the calculation of the fatigue life. For this step the maximum stress at the nodes is extracted from the simulation. With this information, using the fatigue class FAT 225, the operational strength is determined in the form of a maximum number of life cycles that an expansion joint can sustain in operation before failure occurs.
Based on the knowledge gained from the experiment and simulation, a number of 2220 life cycles can be determined. This corresponds, for a refuelling interval of 14 days, a life expectancy of about 85 years and thus significantly exceeds the average operating time of ships, both in tourism and in freight transport. The results of this thesis provide a basis for research in this field. In the future it is considered useful to conduct further
experiments for validation. In addition, further experiments may consider a separation of bellows and pipe of the expansion joint. This could ensure a more reliable evaluation of the material behaviour in the bellows and pipe.
This thesis examines the potential use and its feasibility for use of a LNG expansion joint in ships.
For this purpose, an expansion joint is tested in a climate chamber to determine its behaviour. In this experiment, the expansion joint is cooled down with liquid nitrogen down to -160 °C in order to measure the force and strain on the expansion joint.
The experiment is then simulated with a FE-analysis, whereby a stress analysis is also carried out using FEM.
The last step of the verification of the usability of expansion joints in the LNG sector is the calculation of the fatigue life. For this step the maximum stress at the nodes is extracted from the simulation. With this information, using the fatigue class FAT 225, the operational strength is determined in the form of a maximum number of life cycles that an expansion joint can sustain in operation before failure occurs.
Based on the knowledge gained from the experiment and simulation, a number of 2220 life cycles can be determined. This corresponds, for a refuelling interval of 14 days, a life expectancy of about 85 years and thus significantly exceeds the average operating time of ships, both in tourism and in freight transport. The results of this thesis provide a basis for research in this field. In the future it is considered useful to conduct further
experiments for validation. In addition, further experiments may consider a separation of bellows and pipe of the expansion joint. This could ensure a more reliable evaluation of the material behaviour in the bellows and pipe.
Subjects
LNG
expansion joint
FEM-Simulation
fatigue strength
DDC Class
620: Ingenieurwissenschaften
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