Podcast
Questions and Answers
What is a possible effect of wearing wet gloves for a prolonged period under cold conditions?
What is a possible effect of wearing wet gloves for a prolonged period under cold conditions?
- Plugged sweat glands
- Painful cramps in the most commonly worked muscles
- Affected hands (correct)
- Red bumpy rash with severe itching
What can cause painful cramps in the most commonly worked muscles?
What can cause painful cramps in the most commonly worked muscles?
- Wearing wet gloves for a prolonged period under cold conditions
- Hot, humid environment
- Plugged sweat glands
- Heavy sweating from exercise (correct)
What is a characteristic of a rash caused by a hot, humid environment?
What is a characteristic of a rash caused by a hot, humid environment?
- Affected hands
- Onset can be immediate or delayed
- Painful cramps in the muscles
- Red bumpy rash with severe itching (correct)
When can the onset of painful cramps occur?
When can the onset of painful cramps occur?
What is a possible cause of plugged sweat glands?
What is a possible cause of plugged sweat glands?
What is a common location where painful cramps can occur?
What is a common location where painful cramps can occur?
What is a possible effect of heavy sweating from exercise?
What is a possible effect of heavy sweating from exercise?
What is a characteristic of a hot, humid environment?
What is a characteristic of a hot, humid environment?
What can cause a red bumpy rash with severe itching?
What can cause a red bumpy rash with severe itching?
What is a potential effect of skin contact with the gas?
What is a potential effect of skin contact with the gas?
What is the primary effect of high altitude on the human body?
What is the primary effect of high altitude on the human body?
What is the threshold for immediate danger to life and health?
What is the threshold for immediate danger to life and health?
What is the recommended action when dealing with a serious ammonia leak or spill?
What is the recommended action when dealing with a serious ammonia leak or spill?
What is a characteristic of sulphur dioxide?
What is a characteristic of sulphur dioxide?
What is the primary concern at high temperatures with low humidity?
What is the primary concern at high temperatures with low humidity?
What is a potential hazard of methane in a mine during rescue operations?
What is a potential hazard of methane in a mine during rescue operations?
What is a characteristic of carbon monoxide?
What is a characteristic of carbon monoxide?
What is the recommended action when dealing with a leaking ammonia cylinder?
What is the recommended action when dealing with a leaking ammonia cylinder?
What is the effect of high temperatures with high humidity?
What is the effect of high temperatures with high humidity?
What is oxygen deficiency caused by?
What is oxygen deficiency caused by?
What is a potential source of gas in mines?
What is a potential source of gas in mines?
What is a potential effect of contact with eyes?
What is a potential effect of contact with eyes?
What is the recommended action when dealing with a gas leak in a mine?
What is the recommended action when dealing with a gas leak in a mine?
What is a warning sign of methane presence?
What is a warning sign of methane presence?
What is the primary risk associated with the use of diesel motors underground?
What is the primary risk associated with the use of diesel motors underground?
What is a characteristic of explosive gases and smoke?
What is a characteristic of explosive gases and smoke?
What is the recommended action when dealing with a leaking cylinder that cannot be repaired?
What is the recommended action when dealing with a leaking cylinder that cannot be repaired?
What is the minimum percentage of oxygen required in the air for the unit to function?
What is the minimum percentage of oxygen required in the air for the unit to function?
What happens when the unit is exposed to higher levels of carbon monoxide?
What happens when the unit is exposed to higher levels of carbon monoxide?
What is the purpose of the heat exchanger in the breathing tube?
What is the purpose of the heat exchanger in the breathing tube?
What is the reaction that produces heat in the unit?
What is the reaction that produces heat in the unit?
What is the purpose of the quick start system?
What is the purpose of the quick start system?
What is the maximum humidity level in which the unit can function?
What is the maximum humidity level in which the unit can function?
What is the service life of the unit when properly stored?
What is the service life of the unit when properly stored?
What is the purpose of the regulator in the backpack assembly?
What is the purpose of the regulator in the backpack assembly?
What is the purpose of the facepiece (mask) in the backpack assembly?
What is the purpose of the facepiece (mask) in the backpack assembly?
What is the main composition of toxic smoke?
What is the main composition of toxic smoke?
What is the significance of rollover in a fire?
What is the significance of rollover in a fire?
What is the rating of a fire extinguishing agent marked as 4A 60B C?
What is the rating of a fire extinguishing agent marked as 4A 60B C?
What does the 'C' in the rating 4A 60B C stand for?
What does the 'C' in the rating 4A 60B C stand for?
During which stage of a fire is dense black smoke typically visible?
During which stage of a fire is dense black smoke typically visible?
What is the significance of smoke emanating under pressure from cracks around windows or doors?
What is the significance of smoke emanating under pressure from cracks around windows or doors?
What is the color of the smoke during the decay stage of a fire?
What is the color of the smoke during the decay stage of a fire?
What is the rating of a fire extinguishing agent marked as 10A 80B C?
What is the rating of a fire extinguishing agent marked as 10A 80B C?
What is the significance of smoke-stained or blackened windows?
What is the significance of smoke-stained or blackened windows?
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Study Notes
Hazards of Working in Confined Spaces
- Wearing wet gloves for a prolonged period under cold conditions can affect hands
- Hot and humid environments can cause red, bumpy rashes with severe itching
- Plugged sweat glands can lead to skin issues
Gas Hazards in Mining
- Air gas mixture can be hazardous due to blasting, mine fires, diffusion of gases, and decay of mine timber
- Methane and radon can diffuse from ore or country rock
- Gas can be released from thermal water, including carbon dioxide and hydrogen sulfide
- Diesel motors and absorption of oxygen by water can also contribute to gas hazards
Effects of Altitude, Humidity, and Temperature
- High altitude can cause breathing difficulties due to low oxygen content
- High temperatures with high humidity can be enervating and cause discomfort
- High temperatures with low humidity can cause blistering effects
Acetylene and Ammonia Hazards
- Acetylene can cause fires and explosions
- Ammonia can cause skin burns, stinging pain, and redness
- Ammonia contact with eyes can cause mild irritation to severe burns
Gas Exposure Limits
- 100 ppm of ammonia is immediately dangerous to life and health (IDLH)
Fire Hazards in Mining
- Carbon monoxide can be present in fires and give little warning
- Oxygen deficiency can occur due to combustion or chemical reactions
- Explosive gases and smoke can irritate and obstruct vision
- Methane can cause explosions and fires
- Sulphur dioxide can be present in fires in sulphide ore bodies and give advance warning
- Other gases like hydrogen sulphide, nitrous oxides, and hydrogen cyanide can also be present
Respiratory Protection
- Respirators must provide at least 19.5% oxygen in the air
- They must function in environments with no more than 95% humidity
- They must protect against 1% carbon monoxide for one hour
- They must generate heat when exposed to higher levels of carbon monoxide
- They must have a service life of 10 years and a shelf life of 15 years
Types of Respiratory Protection
- Dräger PSS BG4
- Bio Marine BioPak 240R
Fire Stages
- Incipient stage: fire is just starting
- Growth stage: fire is spreading
- Fully Developed stage: fire is intense and spreading quickly
- Decay stage: fire is burning out
Fire Characteristics
- Dense black smoke indicates a growing fire
- Fire gases filling the fire area indicate a growing fire
- Rollover is visible in a growing fire
- Little or no visible flame in a fully developed fire
- Smoke emanating under pressure from cracks indicates a growing fire
Extinguishing Agents
- 4A 60B C rating indicates an agent can extinguish 60 ft² of Class B fire
- 10A 80B C rating indicates an agent can extinguish 80 ft² of Class B fire
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