The design element and the experiment result of reversible orifices and changing orifices low velocity flow is high.
分析了可逆式孔板流量计和可变式孔板流量计的设计原理和实验结果。
This requires line pipe materials to have higher strength with properties suitable for the environment,such as high deformability or sour gas resistance.
天然气管线的敷设地域正在向遥远地区和环境状况严峻的地区扩展,这就要求管线钢管的材料必须具有高强度和适应环境要求的各种性能,如高可变形性和耐酸性气体腐蚀等。