Hydrogen Cyanide Monitoring Flashcards
What is the STEL for HCN?
4.7 ppm
What is the IDLH level for HCN?
50 ppm
What are the four conditions in which HCN monitoring shall be conducted?
- All structure fires - Vehicle fires within a structure or parking garage - Cooking fires where there is damage to the container and the surrounding area - All smoke investigations or unknown odour incidents
How many HCN detectors are deployed and which vehicles are they on?
10 in total Squads – 6 H101 – 2 P109 – 1 P114 – 1
According to the HCN monitoring policy, all firefighters exiting the hazard zone will:
- Remain on air for two minutes to off-gas PPE naturally
- Report to the decontamination area
- Decontaminate immediately with a light fog spray from the 45-mm hand line if low air prevents two minutes of off-gassing
After off-gassing period, turnout gear with an HCN reading higher than _______ shall use a hose line set to light fog and PPV fan to decontaminate.
2.5ppm
The firefighter conducting the HCN monitoring of bunker gear off gassing shall be in ____ ___ and ____.
- full PPE - SCBA
To operate without SCBA, the atmosphere must read _ ppm HCN.
0
Hydrogen Cyanide Monitoring
Acute exposure to (5-10ppm) HCN includes the following 8 symptoms:
- weakness
- headaches
- confusion
- vertigo
- fatigue
- anxiety
- dyspnea
- nausea and vomitting
Hydrogen Cyanide Monitoring
Symptoms of exposure to increasing levels (25-50ppm) of HCN include?
- respiratory distress
- convulsions and coma in some cases
- if cyanosis present, it may indicate inadequate respiration
- collapse is instantaneuos with large amounts
- unconsciousness with convulsions is almost immediatley followed by death
Hydrogen Cyanide Monitoring
HCN levels are fatal at:
135 ppm after ___ minutes.
181 ppm after ___ minutes.
270 ppm after ___ minutes.
HCN levels are fatal at:
135 ppm after 30 minutes.
181 ppm after 10 minutes.
270 ppm after 6-8 minutes.
