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对于油库中流量较小或间歇输油而不放空的粘油和易凝油，为了防止它们在管道中凝结或在输油过程中粘度过于增大，常采用伴热输送的方法对油品进行保温。保温层投资年分摊费用随保温层厚度的增大而增大；年散热损失费用随保温层厚度的增大而减少。根据三管伴热输油管的传热特征，结合热平衡方程，建立求解保温层经济厚度的目标函数并用０．６１８法求其最优解。在此基础上编制一整套程序系统，为三管伴热输送保温层优化设计提供了科学依据。
For the oil depot in the flow of small or intermittent oil without emptying viscous oil and easy pouring oil, in order to prevent them in the pipeline condensation or in the process of oil viscosity is too large, often using heat transfer method for oil products Insulation. The annual cost of thermal insulation investment will increase with the increase of thermal insulation thickness. The annual loss of heat loss will decrease with the increase of thermal insulation thickness. According to the heat transfer characteristics of the three pipelines with heat transfer, combined with the heat balance equation, an objective function to solve the economic thickness of the thermal insulation layer is established and the optimal solution is obtained by 0.618 method. Based on this, a complete set of programming system is provided, which provides a scientific basis for the optimization design of the three-pipe heat insulation layer.