Severity
Incident
Was Hydrogen Released?
Yes
Was There Ignition?
No
Incident Date
Describe the incident, including corrective steps taken and their result.
The cap on a full cylinder of hydrogen was difficult to remove. A wrench was applied to turn the cap. When the cap was turned, a part of the wrench contacted the valve and opened it. Since the cap was still on the cylinder, the valve could not be closed. The area was evacuated until the cylinder had emptied.
Lessons Learned
A tool is provided for removing the cylinder cap that cannot contact the valve.