Incident overview
The bonnet gasket on the isolation valve between the brine chiller and the oil pot leaked approximately 10 lbs ammonia into the mechanical room. Two (2) refrigeration technicians had completed draining oil from the oil pot and when the isolation valve was closed the bonnet gasket leaked ammonia into the brine chiller insulation. The ammonia detection alarm did NOT (it was turned off as normal practice – but not in the SOP!) activate and the arena was closed to the public at the time of the event.
