一、引言为满足辽河油田产能建设的需要,辽河油田2000年、2001年相继投资对欢三联、冷一联等进行改扩建,我公司负责其中的10000m~3、5000m~3热化学拱顶沉降罐(以下简称沉降罐)的新建工作,其内部构件主要有集油槽、中心管、出水管及水箱、配液管、集水管、原油进出管、加热器,总质量60t,其中集油槽、中心柱及四根出水管安装标高距壁板顶部1.5~2m,配液管安装高度分别为6m和7m。这些内部件不仅结构复杂、 I. INTRODUCTION In order to meet the needs of Liaohe Oilfield capacity building, Liaohe Oilfield has invested and rebuilt Huanlian Sanlian and Lenglianhe in 2000 and 2001 respectively. The company is responsible for the thermal dome vault of 10000m ~ 3,5000m ~ 3 Tanks (hereinafter referred to as settling tank) of the new work, its internal components are mainly sump, the central tube, the outlet pipe and tank, with liquid pipe, water pipe, crude oil inlet and outlet pipe, heater, the total mass of 60t, Column and four outlet pipe installation elevation from the top of the wall plate 1.5 ~ 2m, with pipe installation height of 6m and 7m respectively. These internal parts are not only complicated in structure,