文章利用ANSYS有限元分析软件，对螺旋布孔射孔套管的承载能力进行了分析。
The sustainability of perforating casing with screw holding is analysed by using the finite element software ANSYS.
本文在综合考虑传热性能和摩擦阻力等因素的基础上，对单螺旋槽套管式冷凝器的结构进行了优化和研究。
On the base of both consideration of heat transfer performance and resistance, the optimization and research are carried out on single spiral duct double pipe condenser.
API套管圆螺纹自身存在牙间间隙，并形成螺旋状空间间隙带。
There exists a spiral clearance space in the API round thread casing joint which is effected by the thread tolerance ranges.
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