Repair issues of low-temperature storage tanks
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Case: There is now a liquid oxygen tank with a capacity of 30 m³ and a pressure of 0.8 MPa! Frost has formed at the legs and at the inlet and outlet pipes, and there’s also a large area of moss on the outer top cover! Sir, please explain the reason! ? Furthermore: Technical term – balancing the pressure in the interlayer with nitrogen. What does that mean? A tank that needs repair: How to detect internal and external leaks? What are the general steps for fixing a leaky pot? Thank you! Just starting out in this field, I have so many questions! Seeking knowledge to resolve doubts
The pearlescent sand may have settled, affecting the thermal insulation properties. Using nitrogen to balance the pressure in the layers – is that not an industry term? Our company doesn’t use this phrase. There is a process called nitrogen displacement, which refers to using nitrogen to replace air during vacuuming. How are internal and external leaks detected? ----What are the general steps for helium leak testing of the inner container and interlayer, as well as fixing leaks in the tank? --Cut open the outer tank to repair the inner tank, fit the inner and outer tanks together, weld the outer tank, and evacuate to complete the process
Reply to 2# SuperFree2316: What does helium replacement mean? The inner container and the interlayer are each subjected to helium leak testing; how is this leak testing carried out? Can internal leakage be estimated roughly by checking the pressure gauge after holding the pressure for a while? External leakage refers to the presence of leakage points between the shell and the interlayer, right? I’m sorry for asking such a question again; I really don’t understand this process
Gauge pressure meters cannot detect minor leaks. Doesn’t your company manufacture cryogenic insulated equipment, yet you still take on repair work? These can’t be explained in just one or two sentences
Reply to 4# SuperFree2316: Ah, the jars that need to be repaired. . . .
This post was last edited by SuperFree2316 on 2011-7-31 07:59. 1. Balancing the pressure in the interlayer with nitrogen is a practice used in large cryogenic storage tanks. 2. If there is a large area of moss on the outer top head, it means that the perlite has settled, which affects the insulation properties. 3. Frost has formed at the support points as well as at the inlet and outlet pipes; if this occurs in a tank that has just left the factory, it is likely due to a problem with the design. If it’s an old tank, there should be a dew point. Both the inner and outer cylinders are possible. 4. For maintenance, first measure the vacuum level of the tank. 5. I’m not sure if it’s clear now; let’s discuss any issues together
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