Excessive venting of hydrogen from the tank due to lower facility consumption, in combination with extreme temperature conditions, placed thermal stress on the gland nut, causing a leak. The low consumption of hydrogen resulted from the shutdown of some production equipment and the delay of additional production equipment coming online. The tank size is too large for the facility's current hydrogen demand.

The hydrogen supplier will conduct annual training on handling all types of gases used by the facility and will include the local fire department in this training. The facility will continue daily rounds to look for visual evidence of leaks, and the hydrogen supplier will exchange the 9,000-gallon tank for a smaller 4,500-gallon tank to significantly reduce pressure build up from lower usage.