DESIGN FAILURE MODE AND EFFECTS ANALYSIS (DFMEA) OF THE ROD OF THE SUBSEA PIPELINE LOCKING SYSTEM IN AN OPEN PLET

• DOI: 10.22533/at.ed.3262101062

• Palavras-chave: DFMEA, FMEA, structural analysis, open PLET, subsea pipeline.

• Keywords: DFMEA, FMEA, structural analysis, open PLET, subsea pipeline.

• Abstract:

  One of the most important equipment in a subsea oil and gas production field is the PLET (pipeline end termination), which in its open configuration (open PLET) allows the locking of part of this pipeline at a time after the launch of the equipment itself. Based on preliminary analytical calculation and assumptions made, it was found that the critical component of this system is the locking rod, reason why, in addition to the mentioned calculation, a finite element analysis was performed, obtaining displacement and stress. However, the detection of the regions most susceptible to failure cannot be ruled out only by the calculated safety factors corresponding to these regions. To perform a more comprehensive mapping, a design failure mode and effects analysis (DFMEA) was conducted, resulting in an ordination of the critical regions of the studied component. As the main result, the DFMEA presented the transition region between the thread rod and the slender cylinder as the critical one, both with regard to compression and torsion combined, as well as when the referred efforts are aggregated to the contact with the mobile pin thread.

• Número de páginas: 15