大型环梁式基础油罐边缘板腐蚀的防护

分析了沧州首站８＾＃２００００ｍ＾３浮顶油罐边缘板严重腐蚀的具体情况，产生腐蚀的主要原因是，边缘板与基础间的缝隙进水后，缝隙开口较小，水分不易挥发，形成了边缘板基础和腐蚀环境在较长时间内存在。

Control of Corrosion in the Rim Plates of Bulk Storage Tank with Circular Beam Foundalion.

The actual corrosion status is analyzed of the rim plate of the No. 8 floating roof tank of 20, 000 m3 in Cangzhou Initial Station. The main reason for the corrosion is the corrosive envirenment. This environment is caused by the water which has entered and failed to volatilize out of the narrow clearance between the rim plate and tank foundation. The drawbacks of conventional water proof measures closed type are discussed, and the open water proof structure introduced. According to optimum seeking, it is pointed out to cut away the exposed edge of circular beam and weld a steel ring onto the down side of rim plate. Through comparing this structure with cathod-ic protection, its concluded that the former is characterised by quick and simple construction, high adaptability, and good performance, while the later by high cost and poor performance for the No. 8 tank.