What are the classifications of tubing joints

1. Oil pipe joints are classified according to shape
TUBING joints are classified into five types by shape:
(a) External thickened non-thickened joint -- both ends of the same specification, one end is connected to the external thickened oil pipe, the other end is connected to the non-thickened oil pipe or special thread oil pipe
(b) External thickening and reducing joints -- different specifications at both ends. One end of the Tubing joint is connected to a large extra thickened tubing and the other end is connected to a small tubing
(c) Outer thickening to outer thickening -- the same specifications at both ends. One end of the tubing connector is connected with an external small tubing, and the other end is connected with an external thickened tubing of the same specification;
(d) NIPPLE of the same diameter -- the two ends of the nipple are of the same specification, one end of the nipple is connected to the non-thickened tubing or specially threaded tubing, the other end is connected to the non-thickened tubing or specially threaded tubing,
(e) Non-thickening and reducing joints - different specifications at both ends. One end of the tubing joint is connected to a large non-thickened tubing and the other end is connected to a small tubing
2 Tubing joints are classified by function
Tubing fittings are classified into three types according to their functions
(a) The two ends of the double male short joint are of external thread, with any type of external thickening, non-thickening short joint, external thickening, non-thickening short joint, external thickening, non-thickening short joint, equal diameter short joint, non-thickening short joint.
(b) Conversion connector, one end of which is external thread and the other end of which is internal thread. Screw the coupling on the outer thickening to the non-thickening section, the outer thickening reducer section, the outer thickening to the outer thickening section, the same diameter section and the non-thickening reducer section
(c) The length of the adjusting joint is uncertain, which shall be designed according to the needs of the project. One end is the external thread and the other end is the internal thread. The coupling is screwed on externally thickened to non-thickened sub, externally thickened to externally thickened sub, same-diameter sub and non-thickened sub.