API圆螺纹套管及接箍螺纹紧密距释疑

简单介绍了ＡＰＩ圆螺纹套管及接箍螺纹紧密距检验时所使用的螺纹量规的结构特点，着重阐述了套管及接箍螺纹控制和检验紧密距参数时， 易被忽视和误解的有关长圆螺纹的凸出量、紧密距Ｐ 和Ｐ１ 的正负、手紧紧密距牙数Ａ及短圆螺纹套管紧密距的修正等几个问题。并给出圆螺纹套管及接箍螺纹正确的检验程序， 以避免检验紧密距时产生误判。

Explanation of doubtful points of API round thread casing and coupling thread standoff

This article introduces briefly the design feature of thread gauges used in the inspection of API round thread casing and coupling thread standoff, and expounds some questions relating to the extending amount, the positive and negative sign of standoff P and P 1 , the thread number of hand tight standoff A and the revising of short round thread standoff, which may be ignored easily in the control and inspection of the casing and coupling standoff. The article also gives the right inspecting procedure of the threads of round thread casing and coupling to avoid erroneous judgement in the course of standoff inspection.