The last topic to discuss in this chapter before going into economic optimization of column design is how to determine the diameter and length of the vessel.

在进入塔设计的经济优化方案之前，是本章讨论的最后一个话题，那就是如何决定塔器的直径和长度。

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The paper introduced the principle and methods of supporting combined the slit wedge bolt in small diameter with steel reinforcement in roadway with compound roof, and obtained economic effects.

介绍了回采巷道复合顶板条件下采用小直径管缝式锚杆加钢筋梯式组合网支护的原理、方法和取得的经济效果。

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Meanwhile, the economic flow rate, optimum diameter and economic insulating layer thickness of the equipment and pipeline have been obtained with the model, which provide a basis for pipeline design.

该模型将同时得到经济流速、设备及管道最佳直径和经济保温厚度，可作为管道工艺设计的基础；

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