呼吸阀的选择与油罐凹陷

Selection of Breather Valve and Tank Collapse.

通过对一座柴油罐在雨中瘪罐、后又恢复原状的实例,从理论上分析了《石油储罐呼吸阀》(SY 7511-87)及《石油化工企业储运系统罐区设计规范》(SHJ 7-88)两部规范中按液体流量原则选用呼吸阀存在着口径偏小、吸气量达不到油罐要求的补充量的问题。通过理论分析和计算,给出了呼吸阀最大通气量的计算公式,并认为呼吸阀口径的选取应以吸气阀侧的最大吸气量为依据。综合理论与计算实例,提出热效应吸气量是造成油罐凹瘪的主要原因,进而提出选择呼吸阀的新原则——气体流量原则。

Through the facts that a diesel oil tank collapsed in the storm and then recovered,in theory the paper analyzes the two standards of 《Oil Tank Breather Valve》(SY7511-87)and 《Tank Farm Design Standard for Storage and Transportation System of Petrochemical Industry 》(SHJ-7-88)》 which the breather valve is selected on the basis of liquid's flowrate principle, which exists that the diameter of breather valve is a bit small and the suction air is not in accordance with the filling air of tank required. The equations on the maximum breathing capacity for breather valve are given by theoretical analyses and calculations,and it is considered that the diameter of breather valve to be selected should be on the basis of the maximum suction capacity of induction valve. It is pointed out that the major cause for tank collapse is the suction capacity induced by heat effect combined theory with calculation case, and put forward a new concept in selecting breather valve-air flowrate principle.