Thread Content
There was once an explosion incident in a mixing tank: In a mixing tank that was operated intermittently, the inlet and outlet pipes for the liquid material were combined into one, located at the center of the lower head, due to the different timing of material intake and discharge as well as the need for compact piping layout. The connection between the pipe outlet and the lower head adopts a flush design, which can meet the requirements for liquid discharge; however, from the perspective of liquid filling requirements, this flush design is not entirely appropriate. The liquid enters a relatively large container volume through pipes; as the pressure decreases, phenomena such as flashing, cavitation, and erosion occur, resulting in a thinning of the wall thickness of the container head near the pipe openings. Since this pipe opening faces the mixing shaft, internal inspection is neglected, while external inspection is restricted by the pipe flange and insulation layer, thus becoming a dead zone for inspection. WeChat official account: Pressure Vessel Sharing Station. As a result, the strength near the pipe opening of the lower head of the mixing tank became insufficient, which led to the explosion of the vessel. Therefore, when the process requires the inlet nozzle to extend inward, it must be designed in accordance with the process documents.