Liquid nitrogen tank is generally divided into liquid nitrogen storage tank, liquid nitrogen transport tank two, mainly for indoor liquid nitrogen standing storage, not in the working state for long-distance transport use. Users should be how to use liquid nitrogen tank? The following small series to specifically introduce the correct use of liquid nitrogen tank method, hoping to help everyone.
The proper use of liquid nitrogen tank
In general, the steam loss of water to go after 48 hours to restore the steady state, excellent liquid nitrogen tank to restore the steady state of time required to shrink to twelve hours, evaporation loss can be reduced by 50%. We have met the characteristics of liquid nitrogen and the brief construction of liquid nitrogen cans, so as to use it properly, and to give full play to its performance. The main points of use are summarized below:
First, there must be someone responsible for the management, use and maintenance. Liquid nitrogen tank storage room to air circulation, such as in a closed room storage of more liquid nitrogen tank, the evaporation of nitrogen will stay in the room, resulting in hypoxia, there may be choking accident. Operation of liquid nitrogen cans to avoid the collision with other objects to avoid collision, because the liquid nitrogen tank by exhaust and become a high degree of vacuum, inside and outside the tank by the atmospheric pressure is quite large to DR a 10 and DR a 30 for Example, the outer tank of the pressure, about 4o kg to 9o kg, although it can withstand three times the intensity of self-weight, the operation should also pay attention, must not fall or collision.Liquid nitrogen tank technical personnel to remind the liquid nitrogen tank to keep vertical, is strictly prohibited pouring tank liquid nitrogen to avoid accidents.
Second, the initial filling liquid nitrogen, or liquid nitrogen tank inside the dry state, the first check, see the outside of the tank or no other abnormal situation. There is no foreign body in the tank, the base is really fixed. These conditions are good, you can start filling liquid nitrogen, and should be carried out in a well-ventilated place, generally in the outdoors. Such as in the room, must open the doors and windows to maintain a good ventilation and ventilation. Liquid nitrogen filling is a pressurized injection method, from the large liquid nitrogen container to open the liquid valve connected to the flexible hose, liquid nitrogen tank directly filled with liquid nitrogen. The other is a direct use of funnel pouring method, which should pay special attention to the funnel to make the end of the neck slightly away from the neck, so that the liquid nitrogen gas from the funnel and container clearance smoothly escape, otherwise the liquid from the funnel overflow , Will not only increase the _ liquid nitrogen loss, and will occur frostbite accident. Fill the liquid nitrogen to slow the speed, the first injection of small, and then pause for a few minutes to make it cool and then gradually pay attention to the specified capacity.
Third, take the storage of fine to mention, you should first raise the bucket slightly improved, so that the bottom of the bucket to leave the base, then the bucket parallel to the central tank, go with the natural lift, the action should be quick and easy, So as not to twist or break the handle, take the hopper should also pay attention to avoid touching the inner wall of the neck, so as not to damage the neck, handle to be divided into the circle, cover the cover to avoid running nitrogen.
Fourth, liquid nitrogen to supplement the cycle. What is the amount of liquid nitrogen to be reduced? In general, the liquid nitrogen residue is equal to the full capacity of a report or only enough to use a week to be added as well. To know the additional capacity, the liquid nitrogen cans on the scale weight measurement. A liter of liquid nitrogen weight of 0.8 kg plus the weight of the tank can be obtained when the weight of the full tank, minus the existing weighing, that is, should be added capacity. For the sake of simplicity, a fine stick can be inserted into the liquid nitrogen for a few seconds, the stick quickly removed in the air shaking a few times, insert the liquid nitrogen part of the low temperature and white frost, it is easy to detect the tank Liquid nitrogen stock.
5, with the vehicle transport and handling, the liquid nitrogen due to the vibration of the vehicle followed by oscillation, thereby increasing consumption. The rate of increase in consumption varies with the shape of the container, such as DR-10 liters of liquid nitrogen tank, the delivery time of eight hours, the consumption of about 100 grams (including 0.12 liters) at the same time due to the operation of the handle Increase consumption, such as DR a 10 per operation will consume about 10 grams or so, in order to reduce the activity of storage and safe transport, liquid nitrogen tank to do coat or wooden luggage, especially on the way to prevent the liquid nitrogen tank upside down to avoid ACCIDENT.
Six, liquid nitrogen tank internal washing and drying: liquid nitrogen tank in the process, the accumulation of moisture inside. And mixed with bacteria, may also fall into the handle, and from the handle out of the semen mixed in liquid nitrogen inside. Liquid nitrogen is an inert substance, the container is not corroded inside, due to the above reasons, sometimes there may be a considerable degree of corrosion, if mixed with bacteria, artificial insemination of the conception rate will be reduced. Therefore, the annual liquid nitrogen tank to be cleaned and dried 1 a 2 times, the steps are: ① remove the handle from the container and liquid nitrogen, placed about two days. So that the internal temperature of the container rises to. ° C. ② with 40 ℃ a 50 ℃ warm water or with a neutral detergent into the liquid nitrogen tank, and then scrub with a cloth. ③ rinse with water. ④ reverse the container to dry. Drying method can be used natural dry method or hot air drying method. If the latter, the temperature limit of 40 ℃ a 50 ℃, should avoid more than 60 ℃ hot air, so as not to affect the performance of liquid nitrogen tank, shorten the service life.