The Paper of Prof. Yasuyuki Takata (Principal Investigator, Thermal Science and Engineering Research Division, I²CNER) and his collaborators was published online in “International Journal of Hydrogen Energy.”
The permeation of hydrogen through metals is of great concern in hydrogen containment
systems. In this study, hydrogen contained in seamless coiled tube vessels made of SUS
316L and Inconel 625 permeated the vessel walls at temperatures from 573 K to 773 K, and
the decreasing interior pressure of the vessels was monitored for an extended period to
characterize the behavior of the pressure change. It was found that the pressure became
lower than the surrounding atmospheric pressure, and the vessels reached a vacuum.
Hydrogen permeabilities through SUS 316L and Inconel 625 were determined from the
pressure drop measurements. In order to ensure the reliability of the measurements, the
permeabilities were also determined with a gas chromatograph that measured the concentration
of hydrogen completely permeating the vessel wall. The permeabilities obtained
with the two methods were in good agreement with each other. The pressure drop
behavior was compared to, and found to be consistent with, theoretical calculations performed
using the obtained permeabilities based on Fick’s law of diffusion.
Title: Vacuum generation by hydrogen permeation to atmosphere through austenitic and nickel-base-alloy vessel walls at temperatures from 573 K to 773 K
Authors: N. Sakoda, R. Kumagai, R. Ishida, K. Shinzato, M. Kohno,Y. Takata