The presence of a dent, tube ends which are not reamed or deburred before soldering, and sudden changes in direction can all cause localized high velocity conditions.

• 在焊料焊接之前，没有修整或清理毛刺的管道端口以及管道坑的存在，或者流体的突然转向，都可能产生导致局部高流速的原因。