Severity
Near-Miss
Was Hydrogen Released?
No
Was There Ignition?
No
Describe the incident, including corrective steps taken and their result.
A bourdon tube ruptured in a pressure gage after 528 hours of operation in a liquid H2 system. The alarm sounded, the system was isolated and then vented.
Lessons Learned
The tube was 403 stainless steel, which is subject to hydrogen embrittlement. It is requested that all gauges that have bourdon tubes be replaced with 303 stainless steel.
A web-based resource developed by Sandia National Laboratories to provide data on hydrogen embrittlement of various materials is available at Technical Reference for Hydrogen Compatibility of Materials.