It is an inside BOP (blowout preventer)in the drill string.
投入式止回阀是钻柱内防喷器。
At the present, defects inside a BOP are mainly inspected by conventional methods, such as UT, MT, PT, etc. and it bears a pressure test.
目前，对防喷器等井控装置检测内部缺陷主要采用超声波、磁探、渗透等常规检测以及进行耐压试验，难以发现和判定已有裂纹的扩展。
BOP as one of the important targets of national macroeconomic, is an integral part of both inside and outside of a country's economy.
国际收支平衡作为国家宏观经济的重要目标之一，是一国经济内外均衡不可或缺的组成部分。
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