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1 关于压力容器材料“以厚代薄”问题对于原设计中简体与封头之间为等厚度焊接的容器,制造单位对容器壳体个别部件进行“以厚代薄”(如仅增加封头厚度而简体厚度不变)时,势必增加容器壳体的几何不连续程度,从而引起应力集中,使封头与简体连接部位的局部应力增大。这种不利影响对有应力腐蚀倾向的容器、受交变载荷的容器等都有很大危害。例如:某液化石油气储罐(详见《中国锅炉压力容器安全》杂志1993第4期刊载的《液化石油气储罐高应力
1 About pressure vessel material “to a generation of thin ” problem For the original design between the simplified and the head for the welding of equal thickness containers, manufacturing units of the individual parts of the container shell to “thick” (such as Only increase the thickness of the head and the thickness of the same), it is bound to increase the geometric discontinuity of the container shell, causing stress concentration, so that the head and the simplified part of the local stress increases. This adverse effect is stressful corrosion stress containers, containers subject to alternating load and so have a great hazard. For example: a liquefied petroleum gas storage tank (see “China Boiler and Pressure Vessel Safety” magazine in 1993 fourth issue of "liquefied petroleum gas tank high stress