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Experimental study on the evaluation of dynamic characteristics for LNG storage tank.

Author(s) : LEE K., YANG Y. M., KIM Y. K.

Summary

The dynamic characteristics of a LNG storage tank are very important factors in evaluating seismic response of the tank, since the seismic loads govern the design in most part of the world. However, there were any experimental data available because of the difficulty in performing a test on the large body of the tank. Recently, the R&D division of Korea Gas Corporation developed and constructed a pilot LNG storage tank with a gross capacity of 1300 m3. The main objective of this pilot tank construction is to accumulate field data under different operating conditions, and use them as the basic data in design, construction, and maintenance. As a part of this project, a field dynamic test, so-called modal test, is performed to obtain the dynamic characteristics of the pilot tank. To obtain the dynamic characteristics of a structure, the outer concrete tank was vibrated with a known excitation and their responses were measured in controlled condition. The tank was excited applying the impact force using the sledgehammer. The field data collection and measurement process utilized in this test was single-input multiple-output method. This study describes the instrumentation and measurement process used in the test. From the measured frequency response functions, resonant frequencies and corresponding mode shapes of the tank were extracted and provided. Also, these results were compared to those calculated from a finite element model. It was shown excellent agreement and the validity of the test results within an error range of 7.0%.

Details

  • Original title: Experimental study on the evaluation of dynamic characteristics for LNG storage tank.
  • Record ID : 2008-1145
  • Languages: English
  • Source: LNG 15. Proceedings of the 15th International Conference and Exhibition of Liquefied Natural Gas.
  • Publication date: 2007/04/24

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