Brooke Martin
Oxygen candles, also known as chlorate candles, are self-contained oxygen generators that produce oxygen through a thermal, chemical reaction. They are used as a backup source of breathable air in emergencies, such as when primary and secondary oxygen supplies fail. These candles contain a mixture of sodium chlorate, barium peroxide, and iron powder, which when ignited, produce oxygen at a fixed rate. They are commonly used in aeroplanes, submarines, and space stations, as well as refuge chambers and safe havens. While they provide a valuable source of oxygen in critical situations, there are risks associated with their use, including fire hazards if the candles are mishandled or contaminated.
| Characteristics | Values |
|---|---|
| Purpose | Backup source of breathable air in an emergency |
| Use Cases | Aeroplanes, refuge chambers, submarines, spacecraft, safe havens, space stations, mine rescue |
| Composition | Sodium chlorate, barium peroxide, iron powder, potassium chlorate, lithium chlorate, sodium, potassium perchlorate, lithium perchlorate |
| Functioning | Produces oxygen through a thermal, chemical reaction |
| Benefits | Reliable, relatively safe, long-lasting, independent, compact, stable |
| Risks | Fire hazard, oversaturation, explosion |
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What You'll Learn
- Oxygen candles are used as a backup source of oxygen in emergencies
- They are used in aeroplanes, submarines, refuge chambers, and the International Space Station
- They are self-contained oxygen generators (SCOGs) that produce oxygen via a chemical reaction
- They contain sodium chlorate, barium peroxide, and iron powder
- They can be fire hazards if mishandled or contaminated
Oxygen candles are used as a backup source of oxygen in emergencies
Oxygen candles, also known as chemical oxygen generators, are used as a backup source of oxygen in emergencies. They are often used in refuge chambers, aircraft, submarines, and spacecraft. These candles are designed to produce oxygen through a thermal, chemical reaction when other sources of breathable air are scarce or compromised.
Oxygen candles typically contain a mixture of sodium chlorate, barium peroxide, and iron powder. When ignited, these chemicals undergo a reaction that releases sodium chloride, iron oxide, and oxygen. This reaction occurs at a temperature of about 600°C (1,100°F), and it produces oxygen at a rate of approximately 6.5 man-hours per kilogram of the mixture. The chemical reaction is exothermic, which means it can pose a fire hazard if not handled properly.
In refuge chambers, oxygen candles serve as an independent source of respirable air while rescue operations are underway. They are used as a last resort when primary and secondary oxygen supplies, such as compressed air and oxygen cylinders, fail or become contaminated. The candles provide a reliable and stable source of oxygen that can sustain life during the critical period before rescue.
Oxygen candles are also used in aircraft to supply emergency oxygen to passengers in the event of cabin decompression or loss of pressure. The oxygen masks in aircraft are connected to oxygen generators, which are activated when passengers pull on the masks, triggering a firing pin to initiate the chemical reaction and release oxygen. Similarly, in submarines, oxygen candles are employed as self-contained oxygen generators (SCOGs) to provide backup oxygen in emergency situations.
Overall, oxygen candles play a crucial role in ensuring a supply of breathable air during emergencies, making them a valuable safety measure in various industries, including aviation, space exploration, and mining.
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They are used in aeroplanes, submarines, refuge chambers, and the International Space Station
Oxygen candles, also known as chlorate candles, are used as a backup source of breathable air in an emergency. They are used in aeroplanes, submarines, refuge chambers, and the International Space Station.
In Aeroplanes
Commercial aircraft provide emergency oxygen to passengers to protect them in case of loss of cabin pressure. Oxygen candles are used as a backup source of oxygen in aeroplanes. In narrow-body airliners, overhead oxygen masks and oxygen generators are provided for each row of seats.
In Submarines
Oxygen candles have been used in submarines in emergency situations. For example, in March 2011, the USS New Hampshire, an American nuclear-powered submarine, used oxygen candles successfully when it suffered an oxygen generator failure while under the Arctic ice cap.
In Refuge Chambers
Oxygen candles are an independent and reliable source of respirable air within refuge chambers while preparations for rescue are made. They are used as a backup when the primary and secondary oxygen supplies fail.
In the International Space Station
Oxygen candles are used as a backup supply of oxygen in the International Space Station. The station uses oxygen generators, pressurised oxygen tanks, or solid fuel oxygen generators (also called oxygen candles) to generate oxygen.
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They are self-contained oxygen generators (SCOGs) that produce oxygen via a chemical reaction
Oxygen candles, also known as chemical oxygen generators, are self-contained oxygen generators (SCOGs) that produce oxygen via a chemical reaction. They are used as a backup source of breathable air in emergencies when primary and secondary oxygen supplies may fail. These generators are on standby, ready to produce a finite amount of oxygen. They are often used in refuge chambers, aircraft, submarines, and spacecraft.
Oxygen candles typically contain a mixture of sodium chlorate, barium peroxide, and iron powder, with the oxygen-producing chemical being sodium chlorate. When ignited, this mixture smolders at about 600°C (1,100°F) and can produce oxygen for 12 to 22 minutes, generating enough to sustain life while waiting for rescue. The chemical reaction is exothermic, and the exterior temperature of the generator will reach 260°C (500°F).
In aircraft, oxygen generators are usually found in the overhead compartments or mounted on the top portion of seat backs, depending on the plane's configuration. When passengers pull down on the masks, they trigger the production of oxygen by removing retaining pins. Similarly, in submarines, self-contained oxygen generators are used as a backup supply, providing an essential source of oxygen in emergency situations.
Oxygen candles are also used in refuge chambers, such as those found in mines, where they serve as an independent source of respirable air while preparations for rescue are made. They are designed to be compact, stable, and reliable, lasting for long periods without decreasing oxygen production. However, it is important to handle them with care as they can pose fire hazards if contaminated or mishandled.
Potassium and lithium chlorate, as well as sodium, potassium, and lithium perchlorates, can also be used in oxygen candles. These chemicals, when heated, break down into a salt and release oxygen gas. The Vika oxygen generator used in some spacecraft, for example, relies on lithium perchlorate as its oxygen source.
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They contain sodium chlorate, barium peroxide, and iron powder
Oxygen candles, or chlorate candles, are used as a backup source of breathable air in emergencies. They are often used in aeroplanes, refuge chambers, submarines, and spacecraft. In refuge chambers, oxygen candles are an independent source of respirable air while preparations for rescue are made. They are used when the primary and secondary oxygen supplies fail.
Oxygen candles are cylindrical chemical oxygen generators that contain a mix of sodium chlorate, barium peroxide, and iron powder. When ignited, the candle smolders at about 600°C (1,100°F), producing sodium chloride, iron oxide, and oxygen at a fixed rate of about 6.5 man-hours per kilogram of the mixture. The oxygen-producing chemical is sodium chlorate, which releases oxygen through thermal decomposition. This process is initiated by the burning of iron, which supplies the heat required for the reaction. The initial energy required to start the reaction occurs when a specific initiation mechanism, such as a brass starter, ignites the iron powder.
The chemical reaction that occurs in oxygen candles is exothermic, and the exterior temperature of the generator can reach 260°C (500°F). It will typically produce oxygen for 12 to 22 minutes, although some candles can burn for 60-90 minutes, generating 2600L of oxygen. The candle must be wrapped in thermal insulation to maintain the reaction temperature and protect surrounding equipment.
Oxygen candles are generally reliable and safe, with a long shelf life. However, they can pose a fire hazard if mishandled, so strict safety guidelines must be followed.
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They can be fire hazards if mishandled or contaminated
Oxygen candles are an invaluable source of emergency oxygen in a variety of situations, from aeroplanes to submarines, refuge chambers, and even space stations. They are a reliable, independent, and stable source of oxygen, providing a finite amount of oxygen via a chemical reaction. This reaction involves the ignition of a mixture of sodium chlorate, barium peroxide, and iron powder, which produces sodium chloride, iron oxide, and oxygen.
However, it is important to handle these candles with extreme caution as they can pose a severe fire hazard if mishandled or contaminated. The chemical reaction that produces oxygen is exothermic, meaning it releases heat, and can potentially cause a fire if not properly controlled. Strict safety guidelines are in place to mitigate this risk, but accidents can still occur if the candles are not used correctly.
One of the primary dangers associated with oxygen candles is contamination. If the candle comes into contact with certain substances, it can cause a dangerous reaction. For example, in one tragic incident, a candle aboard a Royal Navy submarine became contaminated with hydraulic oil, resulting in an explosion that killed two sailors. This highlights the importance of strict contamination control measures when handling oxygen candles.
Another potential hazard is oversaturation. If the oxygen concentration in an enclosed space exceeds safe levels, it can increase the risk of fire. Oxygen candles are designed to release oxygen at a controlled rate to avoid this issue, but if they are mishandled or tampered with, it could lead to an oxygen-enriched environment, creating favourable conditions for a fire to ignite and spread rapidly.
In addition to contamination and oversaturation, improper activation or accidental activation of oxygen candles can also lead to hazardous situations. This could be due to human error, equipment malfunction, or a combination of factors. For instance, in 1996, the accidental activation of expired oxygen generators aboard an aircraft resulted in a crash that tragically killed all onboard.
To mitigate these risks, it is crucial to adhere to strict safety protocols when handling and storing oxygen candles. This includes proper training, secure storage, and strict adherence to activation procedures. By following these precautions, the benefits of oxygen candles as a critical source of emergency oxygen can be safely realized.
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Frequently asked questions
Oxygen candles, also known as chlorate candles, are self-contained oxygen generators that produce oxygen through a chemical reaction. They are used as a backup source of oxygen in emergencies.
Oxygen candles contain a mixture of sodium chlorate, barium peroxide and iron powder. When ignited, they smoulder at about 600 °C (1,100 °F), producing sodium chloride, iron oxide and oxygen.
Oxygen candles are used in aeroplanes, submarines, refuge chambers, and the International Space Station as a backup oxygen supply.
Oxygen candles are reliable and relatively safe, but they do pose a fire risk if mishandled. Strict safety guidelines are in place to mitigate this risk.
