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http://dx.doi.org/10.5394/KINPR.2021.45.4.212

Structural Safety Assessment of Piping Used in Offshore Plants According to Thermal Load and Motion  

Ryu, Bo Rim (Department of Marine System Engineering, Graduate School, Korea Maritime & Ocean University)
Kang, Ho Keun (Division of Coast Guard Studies, Korea Maritime & Ocean University)
Duong, Phan Anh (Department of Marine System Engineering, Graduate School, Korea Maritime & Ocean University)
Lee, Jin Uk (Department of Marine System Engineering, Korea Maritime & Ocean University)
Publication Information
Journal of Navigation and Port Research / v.45, no.4, 2021 , pp. 212-223 More about this Journal
Abstract
The objective of this study was to evaluate structural safety according to environmental conditions acting on the piping of offshore structure and the motion of the structure. As for conditions acting on the piping, the maximum and minimum temperature conditions were used to analyze the design conditions of N2 generator. The motion of the structure was calculated and applied according to the DNV(Det Norske Veritas) rule. Each condition was combined and a total of 26 load combinations were constructed according to thermal load, motion load, and presence or absence of pipe support. Analysis was performed using a commercial program MSC Patran/Nastran. Thermal analysis was performed by applying the steady-state method, Sol 153. Thermal-structural coupled analysis was performed using Sol 101, a linear-static method. As a result of the analysis, the stress tended to increase when temperature inside the pipe was lower in Set 1 and Set 2, when temperature was higher in Set 3, and when the temperature difference between the inside and outside of the pipe in Set 4 was increased. However, the sum of stresses in the condition with only temperature load and the condition with only the kinetic load did not show the same value as the stress in the composite load condition of two loads. That is, the influence of the motion load varied depending on the direction of motion, the arrangement of pipes, and the position of the support. Therefore, it is necessary to comprehensively consider the size and direction of the motion load acting on the piping, the arrangement of the piping, and the location of the pipe supports during the design of piping.
Keywords
offshore plant; piping analysis; structural safety; thermal load; thermal-structural analysis;
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