关于asme超声管道校验的另一种试块

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请教：第五卷第四章图T-434.3-2 注2关于切向侧钻孔的长度和深度怎样理解？原文描述如下：
Side-drilled hole diameter, length, and tolerance shall be in accordance with T-434.2.1, as permitted by T-464.1.3. Tangential side-drilled holes at 1/4T, 1/2T, and 3/4T positions or locations are to have the depth confirmed at one-half of their length. The radius of the side-drilled hole shall be added to the measured depth to ensure the correct depth. Where thickness does not permit, the required depth of the sidedrilled hole and the location of the tangential position shall be indicated on the block surface.
比如T=30和T=100的试块，孔的深度和长度是怎么分布的，请指教。

aaaawww

比如T=30和T=100的试块，孔的深度和长度是怎么分布的，请指教。