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Comparison of Dewar and traditional steel cylinders
Date: Jul 30, 2020
The tightness of the Dewar bottle is particularly important. Any leakage may cause the loss of gas. If the carrier is natural gas or a permissible flammable gas, there may be a risk of explosion. Therefore, the inspection of the Dewar bottle (welded insulated gas cylinder) Leakage is very necessary.
Dewar inspection usually has two forms. Vacuum mode and positive pressure mode (sniffer mode), dewars (welded insulated gas cylinders) mostly use the negative pressure form of helium mass spectrometer leak detector, the vacuum form of leak detection, and the helium mass spectrometer leak detector and vacuum system Connection, because HLT550 does not have a backing pump, the vacuum system used on site can be used as the backing pump of the helium mass spectrometer leak detector. The best connection is near the air inlet (that is, the air inlet of the vacuum pump group) ), the vacuum system will have a pump set to vacuum, so the leak detector is connected to the air inlet of the pump in the direction of the air flow, it is easy to have a part of the partial pressure to the leak detector, and then reach the role of leak detection .
Dewar flask can do very good heat insulation work, it can work normally without relying on other external equipment or power supply and other equipment. Its use method is the same as that of traditional steel cylinder. The interface of the Dewar flask is five-eighths of an inch, which is the same as the interface of a traditional steel cylinder, which can be connected to a gas pressure regulator. From connecting the Dewar to the beginning of use, only one person needs to operate it, and the whole process takes about 3 minutes. Calculated by using 10 cans per month, a total of 30 minutes of cylinder replacement time. The entire process from connection to use of traditional steel cylinders takes about 3 minutes. Calculated by using 300 bottles per month, a total of 900 minutes of cylinder replacement time. 
The use of Dewar greatly improves the labor efficiency of workers and reduces their labor intensity. High safety, clean and beautiful working environment. After the Dewar is filled, the pressure inside the bottle is between 0～0.05MPa according to the vacuum degree. The maximum working pressure is 1.6Mpa. At the same time, the Dewar flask is equipped with a 3-fold protection pressure reducing device. The safety performance is very high.
Even if there is an accident, the most serious consequence is that the liquid in the bottle is discharged as a gas, which will not cause casualties and property losses. After the traditional steel cylinder is filled, the pressure in the bottle is between 13 and 13.5 MPa (about 130 kg to 135 kg), which is a high-pressure gas cylinder. In terms of safety, it is only equipped with a fuse. Hazards are prone to occur in high temperature environments, and once an explosion occurs, the consequences are devastating. Low purchase cost Compared with using traditional steel cylinders, the purchase cost of using Dewar is about 20% lower.
Dewar inspection usually has two forms. Vacuum mode and positive pressure mode (sniffer mode), dewars (welded insulated gas cylinders) mostly use the negative pressure form of helium mass spectrometer leak detector, the vacuum form of leak detection, and the helium mass spectrometer leak detector and vacuum system Connection, because HLT550 does not have a backing pump, the vacuum system used on site can be used as the backing pump of the helium mass spectrometer leak detector. The best connection is near the air inlet (that is, the air inlet of the vacuum pump group) ), the vacuum system will have a pump set to vacuum, so the leak detector is connected to the air inlet of the pump in the direction of the air flow, it is easy to have a part of the partial pressure to the leak detector, and then reach the role of leak detection .
Dewar flask can do very good heat insulation work, it can work normally without relying on other external equipment or power supply and other equipment. Its use method is the same as that of traditional steel cylinder. The interface of the Dewar flask is five-eighths of an inch, which is the same as the interface of a traditional steel cylinder, which can be connected to a gas pressure regulator. From connecting the Dewar to the beginning of use, only one person needs to operate it, and the whole process takes about 3 minutes. Calculated by using 10 cans per month, a total of 30 minutes of cylinder replacement time. The entire process from connection to use of traditional steel cylinders takes about 3 minutes. Calculated by using 300 bottles per month, a total of 900 minutes of cylinder replacement time.
Even if there is an accident, the most serious consequence is that the liquid in the bottle is discharged as a gas, which will not cause casualties and property losses. After the traditional steel cylinder is filled, the pressure in the bottle is between 13 and 13.5 MPa (about 130 kg to 135 kg), which is a high-pressure gas cylinder. In terms of safety, it is only equipped with a fuse. Hazards are prone to occur in high temperature environments, and once an explosion occurs, the consequences are devastating. Low purchase cost Compared with using traditional steel cylinders, the purchase cost of using Dewar is about 20% lower.
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