Pipe joint classification

    Tubing pup joint are divided into five types according to their appearance:

    (A) Thickening without thickening short section - the same specifications at both ends, one end of the tubing short pipe connected to thickening tubing, the other end is not connected to the thickening of the tubing or special thread tubing;

    (B) Thicker outer diameter tapered section - different specifications at both ends, one end of tubing short pipe connected to a large outer thick tubing, the other end connected to a small size tubing;

    (C) Thicker outer thickening short section - the same specifications at both ends, one end of the tubing short pipe connected to the outer thick tubing, the other end connected to the same specifications thick tubing;

    (D) The same diameter short section - the same specifications at both ends, one end of the tubing short joints without thickening tubing or special threaded tubing, the other end is not connected to thickening tubing or special threaded tubing;

    (E) Not thickened tapered ends - different specifications at both ends, one end of the tubing nipple is connected to a large gauge non-thickened tubing and the other end is connected to a small gauge tubing.

    Tubing pup joint according to the function is divided into three types:

    (A) Male and female short sections: the specifications at both ends are external thread, thickening without thickening plus short section, thickening variable short section, plus thickness thickening short section, the same diameter short section and not any of a variety of thick tapered joints.

    (B) Conversion of short section: one end of the male thread, the other end of the female thread, the thickening of the thickening of the outer short section, the outer thick thickening short section, And not thickening adjustable short joints screwed on the coupling.

    (C) Adjust the short section: indefinite length, according to the engineering needs of design, one end of the external thread, the other end of the internal thread thickening in the thickening of the short section, thickening variable short section, plus thickening plus Thick and short sections, the same diameter short section and non-thickening on the short section screwed on the coupling.

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