石油化工管道液压试验压力管道材料等级法探讨

摘要

According to the regulations on the hydro-test of piping in the standards of petrochemical industry,the pressure of hydro-test of the piping is determined based upon design temperature and pressure.As different petrochemical units have different design conditions for piping and the testing pressure is different,there are a lot of packages of hydro-tests in the construction.It is suggested to define the hydro-test pressure by a new method called piping class hydro-test.The pressure-temperature limitations were listed out in piping class.For piping whose pressure-temperature limitation is equal to flange pressure-temperature rating,hydrotest pressure for these pipings can be defined as 1.5 times the flange maximum working pressure at normal temperature.This method can apparently reduce the number of packages of hydro-tests while meeting the hydro-test requirements of piping.%根据国家和石化行业关于管道液体压力试验标准的相关规定,现行管道液压试验压力都是以设计温度、设计压力为基础确定的.在石油化工装置中管道的设计条件各异,试验压力也各不相同,造成施工现场管道液压试验分包数量很大.管道液压试验压力管道材料等级法是在管道材料等级规定中明确压力-温度限定值,压力-温度限定值等于法兰压力-温度额定值的管道可以采用同样的液压试验压力,即为1.5倍常温下管道材料等级压力限定值.采用这一方法可以在满足管道液压试验要求的前提下,明显减少管道液压试验分包的数量.