From a cost-benefit perspective, double-layer oil tanks have unique advantages. In terms of initial investment, although the procurement cost of double-layer oil tanks is relatively high compared to single-layer oil tanks, their installation process is relatively simple, which can effectively shorten the construction period and reduce indirect costs such as production stoppage losses caused by construction. In terms of service life, double-layer oil tanks can last for about 30 years, which is 3-5 times longer than the 7-10 year service life of single-layer oil tanks, greatly reducing long-term equipment replacement costs. In terms of maintenance, the maintenance requirements for double-layer oil tanks are only about 1/10 of those for single-layer oil tanks, reducing the investment in maintenance manpower, material resources, and financial resources. At the same time, due to the excellent anti leakage performance of double-layer oil tanks, the risk of environmental pollution caused by oil leakage is reduced, avoiding possible high environmental fines and environmental remediation costs. In addition, the efficient use of double-layer oil tanks has also improved the efficiency of oil storage and turnover, indirectly increasing economic benefits. Overall, double-layer oil tanks can bring significant cost-effectiveness to users in long-term operation.