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凸形封头承受外压(凸面受压)时,一般说来有图算法(或类似的公式法,如BS5500)或是图算法与系数法并列,取其大值者,如美国ASME压力容器规范第Ⅷ卷第一册、BS3915、苏联Bnxmah著《石油炼厂设备设计与计算》等均属此。但是系数法中系数的取值是各不相同的。如ASME规范第Ⅷ卷第一册取值为1.67,BS3915取值为1.2,Bnxmah则取值为1.7。我国《钢制石油化工压力容器设计规定》(以下简称《设计规定》)在1977年版中,也采用图算和系数法并列,系数取值为1.2。从1982年版开始,只采用图算法,取消系数法。是否应该保留系数法,这是目前有争议的
Convex head when subjected to external pressure (convex surface pressure), the general graph algorithm (or similar formula method, such as BS5500) or graph algorithm and coefficient method juxtaposed, whichever is greater, such as the United States ASME pressure vessel Volume VIII of the first volume of the book, BS3915, the Soviet Union Bnxmah “oil refinery equipment design and calculation” and so on. However, the value of the coefficient in the coefficient method is different. Such as ASME Code Volume Ⅷ Volume I value of 1.67, BS3915 value of 1.2, Bnxmah value of 1.7. China’s “Steel Petrochemical Pressure Vessel Design Regulations” (hereinafter referred to as “Design Rules”) in the 1977 edition, but also using the figure calculated and coefficient method tied, the coefficient value of 1.2. Since the 1982 edition, only the graph algorithm was adopted, and the coefficient method was abolished. Whether the coefficient method should be retained is currently controversial