Liquid nitrogen is a high-risk chemical with ultra-low temperature, swelling, odorless and non-toxic properties. In the process of transportation, it is necessary to strictly follow the operation requirements to avoid explosion caused by improper operation and storage of liquid nitrogen tanks , which may result in serious damage to equipment and serious casualties. Therefore, the safety of liquid nitrogen tanks during use should be highly valued. The operation and application of liquid nitrogen tank mainly has the following aspects.
1. Environmental impact
Eliminate high temperature and high pressure
Eliminate collision vibration
The new liquid nitrogen tank has a special anti-shock design, which can be transported and used in the filling state in addition to the static storage.
Avoid the use of liquid nitrogen and the storage environment is not good, which will cause the concentration of nitrogen and nitric oxide in the room to accumulate, reaching the explosion limit and causing an explosion.
2. Improper storage and transportation
The storage types of liquid nitrogen tanks can be generally divided into two types: storage liquid nitrogen tanks and transport liquid nitrogen tanks. The storage liquid nitrogen tank is mainly used for the static storage of indoor liquid nitrogen, and it is not suitable for long-distance transportation under working conditions.
3, improper use
For long-term use of liquid nitrogen tanks, if regular maintenance inspections and maintenance are not performed during the operation, there will be unsafe hidden dangers in the equipment, which may cause an explosion accident.
Liquid nitrogen tank operators must undergo safety education. They can't rely on the master's oral teaching skills to be on the job. The safety quality and skills are poor, and accidents easily occur.
Liquid nitrogen tank safety control measures
The safe use of liquid nitrogen containers should be guaranteed from the following aspects.
1. Check check before use
Before using the liquid nitrogen tank, it should be strictly inspected for its appearance, logo, product certificate and instruction manual. The pressure gauge of the container should be sent to the metrological verification agency for inspection before it can be used. Safety devices such as safety valves and rupture discs of the container must be in good condition to ensure that there are no abnormalities before they can be used.
2. Check the casing for defects before filling.
Before filling the liquid nitrogen tank, check whether the outer casing is recessed or not, and whether the vacuum exhaust port is intact. If it is damaged, the degree of vacuum will decrease. In severe cases, the intake air will not be insulated, so that the upper part of the tank will be frosted, the liquid nitrogen loss will be large, and the value of continued use will be lost.
3. Check the use of the tank at any time during use.
The use of the tank should be checked at any time during use. Under the condition that there is liquid nitrogen in the tank, if the bottle cap and the upper part of the tank are found to have water drops or frost, it means that the quality of the tank is problematic and should be stopped immediately. When there is no water bead or frosting on the bottle cap and upper part, touch the outer casing by hand, and feel the upper part is cold and the lower part is hot, indicating that the quality of the tank body has a problem, that is, the daily increase of liquid nitrogen is large, so it should be observed and prevented. After the liquid nitrogen is consumed, the stored material is damaged. At this time, it is best to stop using it; if the temperature is the same, the tank quality is not a problem. Always check during use; you can use the naked eye to observe, or you can touch the shell with your hand. If you find that the surface is frosted, stop using it. In particular, when the inner wall of the neck tube is frosted and frozen, it is not advisable to use a sharp knife or other sharp tool to scrape it to prevent damage to the inner wall of the neck tube, resulting in poor vacuum.
4. Pay attention to the way to store liquid nitrogen containers
Liquid nitrogen tanks should be stored in a cool, well-ventilated place, and should not be exposed to direct sunlight. In addition, liquid nitrogen tanks cannot be tilted, placed horizontally, inverted, piled up, collided with each other, or collided with other objects, whether they are used or stored, and should be handled gently and kept upright.
5. Establish daily maintenance records
The production and business operation unit shall formulate rules and regulations and safety control procedures for safety production of liquid nitrogen containers, and establish regular inspections and daily maintenance records of containers.
6. Equipped with full-time part-time management staff
The use unit shall clearly define the governance part, and shall be equipped with necessary full-time and part-time management staff to regularly carry out maintenance inspections on the liquid nitrogen containers in use, and find that the faults or hidden dangers shall be immediately stopped, and the accident shall be reported in time. If the surface of the container is frosted or dew on the surface during use, immediately release the pressure and stop using it. Quickly find out the cause and re-inject it after troubleshooting.
7. Can not be on duty if not qualified for safety training
The main person in charge of the production and operation unit, the safety management staff and the equipment operation staff shall receive the necessary safety training, be familiar with the safety production rules and regulations and safety control procedures, have the necessary safety production knowledge, grasp the safety control skills of this position, and enhance prevention. Accidents, control hazards and emergency response capabilities. Employees who are not qualified for safety production training are not allowed to work on the job.
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