Abstract: A double-wall oil tank manufactured by fiber reinforced plastic have been widely applied due to the advantages of light weight and high strength, anti-corrosion and fatigue resistance, convenient fabrication and so on. Based on the service condition of a buried 30 m³ FF double-wall oil tank, the structure of tank manufactured by winding process is designed which is composed by a 4 mm inner wall, a 3.5 mm intermediate wall, a 5 mm outer wall and 13 reinforcement ribs. The response of the oil tank under load cases including external pressure, stability and vehicle running has been analyzed by finite element method, and the results show that the FF double-wall oil tank can fulfill the requirements. A 65 t vehicle running test verifies that the double-wall oil tank is successful. The design method proposed in the paper can be extended to the design for another volume double wall oil tank.

Key words: double-wall oil tank, fiber reinforced plastic, structure design, finite element analysis, composites