确定钢制压力容器试验压力的可靠性理论

RELIABILITY THEORY OF TESTING PRESSURE DETERMINATION FOR STEEL PRESSURE VESSELS

基于钢制内压容器静强度在压力试验时的可靠度分析,建立了统一确定钢制压力容器试验压力的可靠性理论。认为钢制压力容器进行压力试验的目的有三个:(1)使试验压力可能的最小值大于设计压力的可靠度不小于95%;(2)把试验压力可能的最大值控制在一定范围内,尽量让容器在试验时不出现不必要的事故,并把容器在试验时不出现事故的可靠度控制在允许的范围内,确保容器在试验时的安全性;(3)通过压力试验,预测性地把容器在正常操作时的可靠度控制在允许的范围内,确保容器操作时的安全性。在不同失效的准则下,对钢制压力容器静强度的可靠度、试验压力大小与安全系数的关系进行定量探索。结果表明,文中对试验压力系数的取值与我国的标准完全一致。

Reliability theory of unified testing pressure determination for steel pressure vessels is established based on the reliability analysis of internal pressure steel vessels during pressure test.It is recognized that three purposes of steel pressure vessels is concluded that is:(1)The reliability is equal to or greater than 95% that can ensure the possible minimum value of testing pressure grater than design pressure;(2)To control the possible maximum value of testing pressure in a certain range that ensures safe for pressure vessels and ensure the reliability of ves- sels falling in the allowable extent during pres- sure test.(3)To ensure safety to the pressure vessels during normal operation,the reliability of vessels static strength is predictably controlled in allowable rang with pressure test.The quanti- tative analysis is used for the reliability range of static strength of steel pressure vessels,value of testing pressure and safe factor under normal op- eration or pressure test in light of different fail- ure criteria and the results shows that the value of testing pressure coefficient used in this article is completely equal to the value of Chinese standard.