Session: MF-02-01 Materials for Hydrogen Service-Polymers 1

Paper Number: 124249

124249 - The Durability Evaluation of O-Ring Repeatedly Exposed to High-Pressure Hydrogen 

Various In high-pressure hydrogen facilities, most hydrogen leakage is caused by damage to the O-ring used to prevent the high-pressure hydrogen. O-rings used in high-pressure hydrogen undergo extrusion and internal cracks due to volume expansion and cyclic exposure to high-pressure hydrogen. Therefore, O-rings used in high-pressure hydrogen facilities must ensure safety through durability evaluation. In this study, the system of cyclic exposure to high-pressure hydrogen was set to evaluate the durability of O-rings. A high-pressure hydrogen tank and hydrogen compressors were installed to facilitate the repeated exposure of O-rings to a large quantity of hydrogen gas and these facilities were connected to the O-ring durability system. The O-ring was designed to evaluate the side seal and face seal simultaneously, and a detector was also installed to detect hydrogen leakage during the experiment. The cross-sectional areas of O-rings repeatedly exposed to high-pressure hydrogen were analyzed to evaluate whether they were damaged by high-pressure hydrogen. The evaluation conditions were varied to identify factors affecting O-ring damage. The effects on the O-ring according to changes in pressure, the holding time, and the decompression speed were compared and evaluated. In addition, the relationship between the properties of the material of O-ring and the influence of high-pressure hydrogen was evaluated. The properties of the O-ring material before exposure to high-pressure hydrogen were compared with those of the O-ring material after exposure to high-pressure hydrogen, and the relationship between this change in property and the durability of the O-ring was investigated. This relationship can be used to develop O-ring materials with high resistance to high-pressure hydrogen. Also, it is believed that this system can be used to evaluate the durability and service life of O-rings used in high-pressure hydrogen.

Presenting Author: Sang Koo Jeon Korea Research Institute of Standards and Science

Presenting Author Biography: He works at the Korea Research Institute of Standards and Science and conducts research on rubber materials for high-pressure hydrogen.

Authors:

Sang Koo Jeon Korea Research Institute of Standards and Science
Nak Kwan Chung Korea Research Institute of Standards and Science
Un Bong Baek Korea Research Institute of Standards and Science
Seung Hoon Nahm Korea Research Institute of Standards and Science