How much do you know about liquid oxygen?
Liquid oxygen has important uses in industry, aerospace, submarines , medicine and other fields. How many people know the use, storage and transportation of liquid oxygen? The following safety knowledge of liquid oxygen should not be underestimated.
Liquid oxygen is the form of oxygen in a liquid state. It has important applications in the aerospace, submarine and gas industries. Liquid oxygen is a light blue liquid with strong paramagnetism .
Liquid oxygen has a wide range of industrial and medical uses. The industrial method of making liquid oxygen is by fractionating liquid air. The total expansion ratio of liquid oxygen is as high as 860:1 because it is widely used in modern industrial production and military fields.
The main characteristics of physical and chemical hazards
Colorless and odorless gas. At room temperature, the gas has combustion-supporting and oxidizing properties. If the oxygen filling port is stained with grease, when the oxygen is ejected rapidly, the grease will quickly undergo an oxidation reaction. The heat generated by the friction between the high-pressure air flow and the filling port will further accelerate the oxidation reaction. The grease on the filling port or the pressure reducing valve may cause combustion or even Explosion, liquid oxygen is a light blue liquid with strong paramagnetism.
Liquid oxygen makes the substances it comes in contact with very fragile. Liquid oxygen is also a very strong oxidant, and organic matter burns violently in liquid oxygen. Some materials, including asphalt , may explode if immersed in liquid oxygen for a long time.
Hazard Information
Combustion, oxidants, will cause increased combustion. Low-temperature liquids, direct contact with the body can easily cause frostbite.
Precautions
Keep away from sources of heat and fire; avoid direct sunlight. It is strictly prohibited to connect valves, pipes, instruments, etc. Keep the container closed. Wear protective clothing and gloves when filling liquid oxygen.
Safe storage
Avoid contact with organic and combustible materials (such as oils, fats and coal). It is recommended to place the liquid oxygen bottle outdoors. Fireworks are strictly prohibited. Transportation must be labeled with non-combustible gases and oxidizers, compressed oxygen transportation is limited, and liquid oxygen transportation by air and rail is strictly prohibited.
Health hazards
Under normal pressure, when the oxygen concentration exceeds 40%, oxygen poisoning may occur. When inhaling 40%-60% oxygen, discomfort and slight coughing will occur behind the sternum, and then chest tightness , burning sensation and dyspnea will appear behind the sternum, and the cough will worsen;
Pulmonary edema and suffocation can occur in severe cases situation. When the inhaled oxygen concentration exceeds 80%, facial muscles twitch, pale complexion, dizziness, tachycardia, collapse, and then death from tonic convulsions, coma, and respiratory failure . Severe frostbite can occur when skin comes into contact with liquid oxygen. Environmental hazards: Harmless to the environment.
First aid measures
1. Skin contact: If you suffer from frostbite after your skin comes into contact with liquid oxygen, please consult a doctor.
2. Eye contact: Immediately rinse eyes with plenty of water for more than 15 minutes after contact with liquid oxygen.
3. Inhalation: When inhaling pure oxygen or more than 40% oxygen, quickly evacuate the scene to fresh air; if symptoms and signs continue to occur, seek medical attention immediately.
Leak emergency response
1. Operator protective measures and protective equipment: It is recommended that emergency response personnel wear self-contained breathing apparatus and general work clothes. Avoid contact with flammable or combustible materials. Try to cut off the source of the leak.
2. Handling procedures: Quickly evacuate personnel in the leaked contaminated area to the upper wind, isolate them, and strictly restrict entry and exit. Cut off the fire source. Cut off the source of the leak as much as possible. Proper ventilation will speed up diffusion. When liquid oxygen leaks, you must wear protective equipment when entering the site, eliminate all fire hazards, and ensure site ventilation. Keep away from flammable materials to allow leaked oxygen to evaporate.
3. Elimination method: cut off the air source, exhaust (indoor) or strong ventilation (outdoor). If possible, use exhaust fan to send the leaked air to an open area. If liquid oxygen leaks, try to close the source of the leak, evaporate it, and provide on-site ventilation.
Okay, the above is the introduction of relevant information about liquid oxygen.
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