LNG储罐压力安全阀泄放量的计算探讨

Research on calculation of relieving capacity of LNG tank pressure relief valve

基于API和GB规范,对LNG储罐的泄放量计算方法进行总结并比较不同。分别对API和厂家指导手册就公制和美制单位下的储罐压力安全阀的泄放量计算方法进行详细介绍,拟合排放系数关于绝对压力比的计算公式,结果表明拟合公式计算结果与厂家计算值相近。基于某实际工程项目应用,将规范、指导手册、拟合公式计算结果相比较,结果具有较好的一致性。通过对不同规范及厂家标准的比较和计算,可增强工程设计人员对储罐和压力安全阀泄放量的进一步认识,并提供计算指导。

Based on API and GB specifications,the calculation methods for relieving capacity of LNG storage tank were summarized and compared.The calculation methods of relieving capacity for storage tank pressure relief valve in SI units and UCS units were introduced in detail according to API and the manufacturer′s handbook,and the calculation formula for the absolute pressure ratio of the discharge coefficient was fitted.The results showed that the calculation results of the fitting formulas were similar to those calculated by the manufacturer.In addition,a certain engineering project was applied to compare the calculation results of the specification,manufacturer handbook and the fitting formula,which have good consistency.It can enhance the engineering designer′s further understanding of the relieving capacity of storage tanks and pressure safety valves,and provide calculation guidance.