透明管和泵体的材料一致，硬度相当，具有同样的寿命。
Transparent tube and pump body of material consistent, hardness, have the same life.
通过分析超声波硬度传感器的特点，提出采用超声波硬度传感器技术实现对管件镀层硬度进行现场无损测量的方法。
By analyzing the characteristic of the ultrasonic hardness sensor, a nondestructive testing method that using the ultrasonic hardness sensor technology for pipe coat is put forword.
同时，高硬度的金属过渡层与陶瓷层组成的双层复合结构使复合管的使用寿命和安全稳定性显著提高。
At the same time, double compound layer which was composed of metal transition layer with high hardness and ceramic layer improved the service life and safe stability of the composite pipes greatly.
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