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Deformations of the steel shell of a vertical cylindrical tank caused by underpressure

机译：负压导致立式圆柱罐的钢壳变形

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摘要

Underpressure in a tank with a fixed roof may arise in the final stage of its construction as well as during its usage. After completing the construction, when the tank is empty and all manholes and valves, through which air could get into the tank, are tightly closed, underpressure may arise in the case of a sudden change in the weather (air pressure and temperature), which is particularly dangerous in spring or summer. When the tank is in use, underpressure may arise if breather valves are obstructed, e.g. covered by snow during pumping out a product stored in the tank. Underpressure may cause extensive deformations of the shell or the roof of the tank. However, the shell undergoes deformation more frequently, since the roof has a stiff supporting structure. This article presents stages of deformations of the tank shell and their development from the occurrence of the first deformation to either removal of the causes of underpressure or cracking of the steel shell and thus automatic equalization of pressure inside the tank with atmospheric pressure.
机译：具有固定顶盖的储罐中的负压可能在其构造的最后阶段以及使用过程中产生。完成施工后，当油箱为空且所有可能使空气进入油箱的人孔和阀门都被紧密关闭时，在天气（气压和温度）突然变化的情况下，可能会产生负压。在春季或夏季特别危险。在使用储罐时，如果通气阀受阻，例如可能会导致负压。抽出储存在储罐中的产品时被雪覆盖。负压可能会导致罐壳或罐顶变形。但是，由于屋顶具有坚硬的支撑结构，壳体更容易发生变形。本文介绍了罐壳变形的各个阶段，以及从第一次变形发生到消除钢壳欠压或破裂的原因，以及由此消除罐内压力与大气压自动平衡的阶段。

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