Precautions for using steel cylinders
Gas cylinders are generally filled with high-pressure gas. To ensure safe use of cylinders, attention should be paid to the following situations:
Gas cylinders are specially designed pressure resistant steel cylinders for storing compressed gas. When in use, release gas in a controlled manner through a pressure reducing valve (pressure gauge). Due to the high internal pressure of steel cylinders (some up to 15MPa) and the fact that some gases are flammable or toxic, it is important to pay attention to safety when using steel cylinders.
- Check if the laboratory has developed a safety operation manual for the use of high-pressure gas cylinders;
- Is there a dedicated person responsible for the safety management of gas cylinders, and is there education and training provided to steel cylinder users on safety usage;
- Whether regular safety inspections are conducted on gas cylinders, or whether professional departments issue safety certificates;
- Combustible gas cylinders (such as hydrogen, acetylene, etc.) are strictly prohibited from being placed in the laboratory. They should be stored separately, away from heat sources and open flames, well ventilated, and separated from oxygen cylinders;
- Inert gas steel cylinders (such as nitrogen, argon, etc.) placed in the laboratory should be kept away from heat sources, avoid direct sunlight, and have fixed measures to prevent violent vibrations.
- Compressed gas cylinders should be used upright and secured with frames or fences.
- Compressed gas cylinders should be kept away from heat sources and sparks, and placed in a ventilated and cool place to prevent direct sunlight exposure. Heating is strictly prohibited; Combustible gas cylinders must be stored separately from oxygen cylinders; No flammable materials shall be stacked around, and flammable gases are strictly prohibited from coming into contact with ignition sources.
- It is prohibited to move and strike steel cylinders at will. When allowed to move, it should be handled with care.
- When using, pay attention to checking the airtightness of the steel cylinder and the connecting gas circuit to ensure that there is no gas leakage. When using gas in a steel cylinder, a pressure reducing valve (pressure gauge) should be used. Various gas pressure gauges should not be mixed to prevent explosions.
- After use, close the valve according to regulations, and the main valve should be tightened without leakage. Develop the habit of checking gas cylinders when leaving the laboratory.
- Do not use up all the gas in the steel cylinder, and always keep a residual pressure of 0.05MPa or above (gauge pressure of the pressure reducing valve). Combustible gases such as acetylene should have a residual pressure of 0.2-0.3 MPa.
To avoid mixing up various gases and using the wrong gas, a specific color is usually painted on the outside of the gas cylinder for differentiation, and the name of the gas inside the cylinder is written on the cylinder.
- Never allow oil or other flammable organic substances to stick to gas cylinders (especially valves and pressure reducing valves). It is also not allowed to block with cotton, hemp or other materials to prevent accidents caused by combustion.
- All types of gas cylinders must undergo regular inspections in accordance with national regulations. During use, attention must be paid to the condition of the steel cylinders. If serious corrosion or other serious damage is found, the use should be stopped and inspection should be reported in advance.