Instructions for use of Tianchi liquid nitrogen tank:
Before using Tianchi liquid nitrogen tank products, users should check the appearance quality of the products out of the box. If the container is defective in appearance, they should return this information to the sales department of our company within 5 working days after receiving the product (see the back cover for contact information), and the agents and distribution units will implement it according to the relevant provisions of the agreement.
Tianchi liquid nitrogen tank container can only be used to fill liquid nitrogen, not liquid air and liquid oxygen, so as to avoid their violent combustion with some substances in the container.
Liquid nitrogen is an ultra-low temperature liquid (-196℃), which will cause similar burns if splashed on the skin. Therefore, when filling and taking out liquid nitrogen, you should wear warm gloves, not barefoot or wearing slippers, so as not to spill liquid nitrogen and hurt people.
Tianchi liquid nitrogen storage tank is prohibited from being used as a transport tank. If you need to transport liquid nitrogen, you must use a special liquid nitrogen transport tank, such as YDS-30B produced by our company, which is a special liquid nitrogen transport tank. This tank has a special structural design to prevent vibration.
Only the neck plug matched by the manufacturer can be used to close the tank mouth, and other plugs cannot be used instead, let alone sealing plugs. In order to avoid the continuous evaporation of liquid nitrogen, the pressure of nitrogen increases and the container is damaged.
When checking the liquid level in the container, insert a solid plastic stick or small wooden stick at the bottom and take it out after 5- 10 seconds. The length of frost is the height of liquid level. Never use a hollow rod or plastic pipe to prevent liquid nitrogen from spraying out of the pipe and injuring people.
Although nitrogen is odorless, odorless and nontoxic, in the case of poor ventilation, the evaporated nitrogen will increase the amount of nitrogen in the indoor air and reduce the oxygen content, which will cause suffocation to the human body. Therefore, indoor ventilation should be strengthened at the storage location and operation point of liquid nitrogen storage tanks to keep the air fresh.
The neck tube is the passage for the import and export of liquid nitrogen and frozen goods. Don't scratch the pipe wall when using. If the neck tube is damaged, the container cannot be maintained.
The vacuum sealing joint of Tianchi liquid nitrogen storage tank is the key component to maintain the vacuum of container interlayer. Once it is damaged, the vacuum of the container interlayer will deteriorate immediately, and the product can no longer be used. Therefore, users are not allowed to open the vacuum sealing joint of the container without authorization.
2. Matters needing attention of liquid nitrogen storage tank
Matters needing attention in the use of liquid nitrogen storage tank:
1. Due to the large heat in the liquid nitrogen tank, it takes a long time to heat balance when filling liquid nitrogen for the first time, so you can fill a small amount of liquid nitrogen medium for pre-cooling (about 60L) first, and then slowly fill it (it is not easy to form ice jam).
2. In order to reduce the loss when adding liquid nitrogen in the future, please add liquid nitrogen when there is still a small amount of liquid nitrogen in the liquid nitrogen tank. Or within 48 hours after using up the liquid nitrogen.
3. In order to ensure the safety and reliability of the liquid nitrogen tank, the liquid nitrogen tank can only be filled with liquid nitrogen, liquid oxygen and liquid argon.
4, infusion, liquid nitrogen tank surface water, frost, is a normal phenomenon. When the pressurization valve of the liquid nitrogen tank is opened for pressurization, because the pressurization coil is attached to the inner wall of the outer cylinder of the liquid nitrogen tank, the coil of the liquid nitrogen tank will absorb the heat of the outer cylinder for vaporization to achieve the purpose of pressurization, and spot frost may appear on the outer cylinder of the liquid nitrogen tank. After closing the booster valve of the liquid nitrogen tank, the frost spots will slowly disperse. When the booster valve of the liquid nitrogen tank is closed and there is no infusion work, there is water condensation and frost on the outer surface of the liquid nitrogen tank, indicating that the vacuum of the liquid nitrogen tank has been destroyed and the liquid nitrogen tank can no longer be used. The liquid nitrogen tank should be repaired or scrapped by a professional manufacturer.
5. When transporting liquid nitrogen medium on the third-class and below roads, the speed shall not exceed 30 kilometers per hour.
6. The seal and lead seal of the vacuum nozzle and safety valve on the liquid nitrogen tank shall not be damaged.
7. If the liquid nitrogen tank is not used for a long time, please discharge the liquid nitrogen medium in the liquid nitrogen tank and blow dry it, and then close all valves for sealing.
8. Before filling the liquid nitrogen tank with liquid nitrogen medium, dry the container liner and all valves and pipelines with dry air, and then fill the liquid nitrogen medium, otherwise the pipeline will freeze and block, which will affect the pressure increase and infusion.
9. Liquid nitrogen tank belongs to instruments, so handle it with care. When opening the valve of liquid nitrogen tank, the strength should be moderate, not too large and not too fast; Especially, when connecting the metal hose of the liquid nitrogen tank with the joint at the inlet/outlet valve, do not screw it too tightly, but screw it into place with a little force to seal it (the ball head structure is easy to seal), so as not to break the nozzle of the liquid nitrogen tank, and hold the liquid nitrogen tank with one hand when screwing.
3. What should I pay attention to when storing liquid nitrogen tanks?
Storage of liquid nitrogen storage tank
I. Placement of Liquid Nitrogen Tank
Liquid nitrogen tanks should be stored in a well-ventilated and cool place, and should not be exposed to direct sunlight. Due to its precise manufacture and inherent characteristics, liquid nitrogen tanks are not allowed to be tilted, placed horizontally, inverted, stacked, collided with each other or collided with other objects, and should be handled with care and always upright.
Second, the cleaning of liquid nitrogen tank
When the liquid nitrogen tank is not in use, it should be washed with clear water, drained, dried with a hair dryer and put at room temperature for later use. After the liquid nitrogen in the liquid nitrogen tank volatilizes, the remaining missing substances (such as frozen * * *) will melt quickly and become liquid substances attached to the tank, causing corrosion to the aluminum alloy tank. If a cavity is formed, the liquid nitrogen tank must be scrapped. Therefore, after the liquid nitrogen in the liquid nitrogen tank is exhausted, it is necessary to scrub the tank. The specific scrubbing method is as follows: firstly, take out the steel cylinder and put it in a liquid nitrogen tank, take out the liquid nitrogen and leave it for 2-3 days. When the temperature in the tank rises to about 0℃, pour warm water at about 30℃ and scrub it with a cloth. If it is found that individual melted substances stick to the bottom of the liner, it must be carefully cleaned. Then rinse with clear water several times, then turn the liquid nitrogen tank upside down and put it in a safe place indoors to dry naturally, or blow dry with a hair dryer as mentioned above. Note that during the whole brushing process, the action should be gentle, the pouring temperature should not exceed 40℃, and the total weight should not exceed 2kg.
Third, the safe transportation of liquid nitrogen storage tanks
Liquid nitrogen tanks must be packed with wooden frames, padded and fixed during transportation. Pots should be separated by fillers to prevent bumping and dumping. When loading and unloading vehicles, it is necessary to prevent the liquid nitrogen tank from bumping, and it is not allowed to drag on the ground at will, so as not to reduce the service life of the liquid nitrogen tank.
The above is the content of Baidu encyclopedia. Let me add one more thing:
It is very important not to break or even remove the protective layer (such as kraft paper) outside the liquid nitrogen tank during storage. Firstly, the protective layer has a certain heat insulation function, and secondly, the protective layer has a certain buffering function, which can reduce the impact force in accidental collision to a certain extent.
I hope it helps you!
4. What are the precautions for placing a liquid nitrogen tank?
Liquid nitrogen is a cryogenic liquid with a boiling point of-196℃. Because of its particularity at low temperature, a special liquid nitrogen container-liquid nitrogen tank is generally used for storage. Some users are worried that liquid nitrogen feels a little dangerous, frostbite and leakage. Beijing Texaco Technology suggests that if the liquid nitrogen tank is placed and preserved normally, it is not so terrible. Let's talk about the placement of liquid nitrogen tanks.
The liquid nitrogen tank should be placed in a cool and ventilated place, because liquid nitrogen can expel oxygen and suffocate. In order to ensure the safety of manual operation, it should be selected in a ventilated place. In addition, the liquid nitrogen tank should be stored in a cool place to avoid sun exposure, otherwise it will lead to rapid evaporation of liquid nitrogen. Do not put heavy objects on the neck plug of the liquid nitrogen tank, otherwise the liquid nitrogen in the tank will not volatilize normally and damage the tank. In addition, the liquid nitrogen tank should not be tilted, placed horizontally, inverted, bumped or collided, and the tank should be kept upright. As long as this is done, the liquid nitrogen tank is safe and there is no danger.
5. Matters needing attention in using liquid nitrogen tank and the use and characteristics of liquid nitrogen. Thank you.
Storage containers are mainly used for indoor static storage of liquid nitrogen and frozen items, and cannot be used for vehicle transportation; In order to meet the use conditions of transportation, the transportation container is specially designed for shock prevention. The container can be stored at rest, but it can also be used for transportation when it is filled with liquid nitrogen, but collision and violent vibration should be avoided.
If liquid nitrogen is added to the container indoors, please pay attention to open the doors and windows to prevent the operating environment from being seriously deprived of oxygen. New containers or containers that are reheated after thawing must be filled with a small amount of liquid nitrogen for pre-cooling before use, and then filled with liquid nitrogen after adhering to near thermal balance (gasification is not intense).
When filling liquid nitrogen, it is advisable to use a pump or a long funnel, and the filling pipe should be inserted near the bottom of the container, leaving a gap in the middle of the container so that nitrogen can be discharged. W3 (4) What about the shortage of acetylene? Exhaustion seems to be correct. 2. What about apricots? Yo? Yue? Uncle Cheng? 2~3 hours after the container is filled with frozen goods for the first time, it is suggested that the experimenter regularly observe whether there is condensed water or frost on the outer surface of the container. If these two situations occur, it shows that the vacuum degree of the container has become worse, which will cause the liquid nitrogen in the container to evaporate in a short time and the container cannot be used normally. Although the probability of this phenomenon is very small, it may be caused by not loading, unloading and transportation according to the product requirements, but in order to avoid the loss of frozen products, this observation is necessary.
Please note that the container shell has withstood the atmospheric pressure of the use and transportation environment. In the process of use or transportation, if serious collision or heavy pressure occurs, the surface of the container shell will sag, resulting in product damage or failure. The container is designed for storing and transporting liquid nitrogen, and it is strictly forbidden to contain liquid oxygen.
The container liner is at normal pressure, and it is not allowed to inflate and pressurize or seal the container mouth at will. The neck tube is the passage for liquid nitrogen and frozen objects to enter and exit. Don't scratch the pipe wall when using.
Container vacuum sealing joint is the key component to keep container interlayer vacuum. Once damaged, the vacuum of the container interlayer will deteriorate immediately, and the product can no longer be used. Therefore, users are not allowed to open the vacuum sealing joint of the container without authorization. Check the storage amount of liquid nitrogen in the container by weighing method, or insert thin wooden poles and bamboo poles into the liquid nitrogen according to the frosting height (liquid level height) of the liquid nitrogen. Never insert liquid nitrogen into a hollow tube, lest noodles spill out of the tube and hurt people.
Pay attention to replenish liquid nitrogen in time during use. When liquid nitrogen is added to the container, the liquid level should not be higher than the lower plane of the empty neck tube. Please be careful when handling and handling frozen items.
If the container needs to be cleaned, first clean it with neutral detergent, and then rinse it with warm water not higher than 50℃. After cleaning, it should be dried in the tank (preferably with hot air not higher than 50℃), cooled to normal temperature, and then filled with liquid nitrogen.
Do not open the vacuum sealing joint of the container without authorization. When the storage container is full of liquid nitrogen or frozen items, it cannot be used for vehicle transportation.
When the container is safely filled with liquid nitrogen, if it is found that there are a lot of abnormal phenomena such as condensed water and frosting on the surface of the container, it should be repaired in time. The container should be placed in a cool, ventilated and dry environment; When stored for a long time, attention should be paid to regularly checking the liquid level and the outer surface of the container for condensation and frost.
6. What should I pay attention to when using liquid nitrogen tanks?
Storage containers are mainly used for indoor static storage of liquid nitrogen and frozen items, and cannot be used for vehicle transportation; In order to meet the use conditions of transportation, the transportation container is specially designed for shock prevention. The container can be stored at rest, but it can also be used for transportation when it is filled with liquid nitrogen, but collision and violent vibration should be avoided.
If liquid nitrogen is added to the container indoors, please pay attention to open the doors and windows to prevent the operating environment from being seriously deprived of oxygen.
New containers or containers that are reheated after thawing must be filled with a small amount of liquid nitrogen for pre-cooling before use, and then filled with liquid nitrogen after adhering to near thermal balance (gasification is not intense). When filling liquid nitrogen, it is advisable to use a pump or a long funnel, and the filling pipe should be inserted near the bottom of the container, leaving a gap in the middle of the container so that nitrogen can be discharged. W3 (4) What about the shortage of acetylene? Exhaustion seems to be correct. 2. What about apricots? Yo? Yue? Uncle Cheng?
2~3 hours after the container is filled with frozen goods for the first time, it is suggested that the experimenter regularly observe whether there is condensed water or frost on the outer surface of the container. If these two situations occur, it shows that the vacuum degree of the container has become worse, which will cause the liquid nitrogen in the container to evaporate in a short time and the container cannot be used normally. Although the probability of this phenomenon is very small, it may be caused by not loading, unloading and transportation according to the product requirements, but in order to avoid the loss of frozen products, this observation is necessary.
Please note that the container shell has withstood the atmospheric pressure of the use and transportation environment. In the process of use or transportation, if there is a serious collision or heavy pressure, the surface of the container shell will sag.
7. How to judge the quality of liquid nitrogen tank?
1. During the use of the jar, check the usage of the jar at any time every day. On the premise of liquid nitrogen in the tank, it is found that there are water drops or frost on the upper and upper parts of the tank cover, which indicates that the tank has quality problems and should be stopped immediately;
2. When there is no water drop or frost on the top of the bottle cap and jar, touch the shell with your hand. It is cold on the top and hot on the bottom, indicating that there are some problems in the quality of jar, that is, liquid nitrogen is losing more and more. Pay attention to observation to prevent the stored substances from being destroyed after the liquid nitrogen is consumed, and it is best to stop using it when necessary; If the upper and lower temperatures are the same, there is no problem with the quality of the jar.
3. After opening the cork, the fog at the bottle mouth does not overflow, but sinks, indicating that the jar is good.
Listen with your ears to see if there are any bubbles coming out of the bottle. If bubbles often appear, it means there is something wrong with the quality of the jar, otherwise there is no problem.