管帽包括凸形管帽、锥壳、变径段、平盖及紧缩口的设计。
Tube caps include convex hull, hats, cone tube diameter changes, flat cover and tightening of design.
对于壳体上的特殊变径段折边封头，应视工厂加工能力采用相应方案。
For the special flanged head at reducer section on shells, the plan shall depend on the fabrication capacity of plants.
但是在不规则井眼中，小范围深度段的突然变径会导致线圈阵列中只有一个线圈输出信号，而其它线圈内的信号为零。
However, a sharp increase in diameter over a small depth interval can induce signals on one coil in the array and not in others.
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