The structure of the S&S double-layer oil tank consists of an inner shell made of 6mm steel plate and an outer shell made of 4mm steel plate, combined together. A 4mm gap layer is maintained between the inner and outer shells for leak detection. The S&S oil tank is primarily used in outdoor environments, with its double-layer steel plate structure being resistant to impacts, while also allowing the use of auxiliary equipment such as leak detectors to ensure the safety of the oil tank.