- Safety Systems
- Measurement / Sensing Device
- Ventilation System
- Exhaust Fan
- Batteries and Related Equipment
Redundant safety systems prevented this event from becoming an incident. The 1%-hydrogen-concentration-level-triggered fan was backed up by a 2%-hydrogen-concentration alarm. The alarm is continuously monitored (24/7) by a remote Network Operations Center (NOC).
Since this event, a pressure switch has been added to alarm in case of a fan failure and is also continuously monitored by the remote NOC.
Future standards will require two ventilation fans, one running continuously and the other triggered to start when a 1% hydrogen concentration is reached.
Adequate ventilation of battery charging facilities is addressed in the Lessons Learned Corner on this website.