permanent facility

Quality management review of permanent equipment of hydroelectric engineering;

水利工程永久设备质量管理实践

And it also put forward the basic idea of permanent design.

从经济、技术、管理角度对延长公路工程使用寿命的可行性、注意事项及其意义进行探讨,提出了永久性设计的基本理念。