Author/Authors :
Shekari، Elahe نويسنده Department of Technical Inspection Engineering, Petroleum University of Technology, Abadan, Iran Shekari, Elahe , Shishesaz، Mohammadreza نويسنده Department of Technical Inspection Engineering, Petroleum University of Technology, Abadan, Iran Shishesaz, Mohammadreza , Rashed، Gholamreza نويسنده Department of Technical Inspection Engineering, Petroleum University of Technology, Abadan, Iran Rashed, Gholamreza , Khayer، E نويسنده Iranian Offshore Oil Company, Bahregan Oil District, Iran Abstract Khayer, E
Abstract :
The current study assesses the root causes of hydrogen blisters on low strength carbon steel
equipment. For this purpose, some experiments including hardness test, non-destructive test (NDT),
metallography, and fractograpghy are conducted. The microstructure of two blisters is assessed by
means of optical microscopy and scanning electron microscopy (SEM). The microstructural studies
show that the steel plate has some inclusions and banded ferrite/pearlite structure. The energy
dispersive x-ray spectroscopy (EDS) results indicate that these inclusions mainly contain Mn, S, Al,
Ca, and Si. The results show that the inclusions and planar imperfections found in the NDT have
been the nucleation locations for blisters in the plate. Remediation action plans are recommended to
prevent further occurrence and growth of hydrogen blisters.
