What are the hazards of damaged insulation in the process pipelines for cold materials?
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What are the hazards of damaged insulation in the process pipelines for cold materials? Affected by the external ambient temperature, could different local thermal stresses in the pipeline occur, thereby causing the cold material inside the pipeline to boil violently?
There must be frost outside, increasing heat loss.
After both ends of the pipe are sealed, thermal expansion inside the closed pipe causes the pipe to rupture
1. In the case of insulation failure in a low-temperature pipeline operating in continuous production, freezing occurs at the point of failure; this freezing is severe, and as a result, heat loss increases. Low-temperature pipelines are made of stainless steel, so even when they are exposed to ice and water for extended periods, the pipelines themselves as well as the flange bolts are less likely to rust. Unless the quality of the stainless steel is substandard. In this case, the pipeline will not have major problems. 2. If a low-temperature medium remains in the pipeline with both ends’ valves closed, it is known as residual liquid. At this point, since the low-temperature liquid has not been completely drained, continuous heat absorption during evaporation causes overpressure in the pipeline, prompting the safety valve to activate. If there is no pipe safety valve, high-pressure leaks can occur at the pipe flange connections, especially at the valve flanges, which is quite dangerous. It is best to find a drain to discharge the low-temperature residue. This is safe.