In this paper,the pontoon settlement in a 5 000 m3 gasoline tank due to product loading is described.To dispose the accident, the original steel pontoon is substituted with aluminum pontoon.

• 为提高内浮顶罐浮盘的抗沉能力，将钢制浮盘改造为铝质浮盘，叙述了具体的施工步骤及实际应用中应注意的事项。