The module stool is a key structure to link the module and the deck in floating production, storage and off-loading (FPSO). The welded joints of the module stool should be guaranteed to possess enough toughness against cracking and rupture. Based on the international standard BS 7448 and DNV-OS-C401, a low temperature (−18°C) crack tip opening displacement (CTOD) test has been conducted on the weld centre and the fusion line of the module stool of a 300 kt FPSO, to be used in the Bohai PL19-3 offshore oil field. The results show that the CTOD values of the specimens of the module stools whose crack tips are located in the weld centre and the fusion lines, respectively (welded with preliminary welding procedure specification), meet the requirements of DNV-OS-C401 (not less than 0.150 mm). Therefore, the preliminary welding procedure specification test can be used to weld the module stool for which no further heat treatment is needed. Accordingly, the quality of the module stools is assured, the fabrication efficiency is improved and the production cost is reduced.
Research on low temperature CTOD toughness for welded joints of the module stool of an FPSO
Ships and Offshore Structures ; 5 , 1 ; 75-80
2010-03-18
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
CTOD , welded joints , FPSO , module stools
Research on low temperature CTOD toughness for welded joints of the module stool of an FPSO
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