Shandong natural gas storage tank vacuum degree 60 cubic meter horizontal low-temperature storage tank price discount

Description :

low-temperature storage tankPearl sand should be filled after passing the vacuum leak detection. For storage tanks of different sizes, the quantity of pearl sand should be determined according to the drawing requirements. Fresh pearl sand should be used for filling, and sand with obvious moisture content and high density should not be used. Pearl sand should be treated with special drying equipment to ensure its moisture content is less than 0.3% before filling.

　　For low-temperature storage tanks with a capacity of less than 30 cubic meters, a rotary vane pump can be used as the sand filling pump. For low-temperature storage tanks with a capacity greater than 30 cubic meters, a water ring pump can be used as the sand filling pump. After filling the tank with sand, the interlayer should be subjected to 2-4 air flow impacts using the evacuation method to ensure uniform sand density without gaps. In addition, during the process of filling pearl sand, a vibration pump is also required to enhance the flowability of the sand by vibrating the tank body, in order to ensure the uniform distribution of pearl sand.

　　If the vacuum degree does not increase significantly during evacuation, consideration should be given to whether the cleanliness of the interlayer is qualified and whether the moisture content of the pearl sand exceeds the standard. At this time, nitrogen should be used to heat the outer cylinder of the low-temperature storage tank interlayer vacuum balance, and the inner cylinder can also be heated. When heating, attention should be paid to the surface temperature of the outer cylinder not exceeding 230 ℃, and the outlet gas temperature of the inner cylinder should not exceed 80 ℃. The heating method can be electric heating or liquefied gas flame heating. Attention should be paid to personal safety and equipment safety during heating, and long-term heating should be avoided as much as possible. Heating should start from the bottom of the container, and the container should be heated evenly. The heating time depends on the size of the container, generally ranging from 20 to 60 minutes. After heating, the surface temperature of the container should increase by more than 10 degrees. The evacuation effect should be started quickly and significantly.

　　After the vacuum degree of the low-temperature storage tank meets the requirements of the drawing, it can be stopped for observation for 24 to 48 hours. Determine the evacuation time based on the change in vacuum degree. When the interlayer vacuum degree is above 50 grids, the daily decrease should not exceed 1 grid to be qualified.

　　If the vacuum degree meets the requirements of the drawing and the leakage rate can meet the requirements, vacuum sealing can be carried out. And keep daily vacuum records, with at least two vacuum records per day.

　　A low-temperature storage tank consists of an inner container and an outer container, and the interlayer space inside and outside needs to be filled with pearl sand as a cold insulation material. After filling it tightly, it is evacuated to a qualified vacuum degree to serve as a vacuum insulation layer. Therefore, the correct filling of pearl sand is particularly important, and this process is an important part of ensuring the performance of low-temperature liquid storage tanks.

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