Shenli Oilfield and Henan Sifang Anti-corrosion Company have developed jointly a new reparation technique called compound structure with foam layer placed in between two glass fiber reinforced plastics to repair specific tank area, such as tank roof.

The precautions in the design of anchor storage tanks are studied, such as design of tank walls and roofs, determination of anchoring force and calculation of anchor seat etc.

This paper comprehensively recommends some forms of the roof structure which are frequently used in tank enginnering,and briefly describes their structural features, operating ranges and serviceable conditions.

The paper provides 2 accident cases of lightning stroke and fire for floating roof oil tank.

This paper analyzes a series of fire accidents caused by lightning strike on seal ring of large floating roof tanks,and points out their safety problems.

At present, there is no concrete requirement for leakage test of floating roof tank demanded by China national standards or American Society of Petroleum standards.

Development course of very large floating roof tanks in China were summarized and its state of the art was introduced.

During the first practice of lifting a 20 000 m*3 floating roof tank, because the law of lifting force distribution on the tank wall is not clear,the technique of lifting a tank body and the floating roof separately is adopted in order to minimize the stress of the tank wall.

A method to measure the geometric height of pontoon roof of vertical floating roof tank is presented in th: article.