以一环境低温储罐的设计为例 ,就压力容器低温降及低应力工况的不同设计方法进行了探讨 ,提出了恒压低温降及低应力工况和降压低温降及低应力工况这 2个新概念 ,建议在设计时应对这 2种工况区别对待 ,采用不同的设计方法。 Taking an environment cryogenic storage tank design as an example, the different design methods of low temperature drop and low stress condition of pressure vessel are discussed. The conditions of constant pressure, low temperature drop, low stress, low pressure drop and low stress are put forward These two new concepts, proposed in the design of these two conditions should be treated differently, using different design methods.