Features and Deficiencies of Outer Thickened Tubing

　　Features of outer thick tubing:

　　1. Enhance connection strength through upsetting of joints;

　　2. Sealing is achieved through cooperation with thread grease.

　　Disadvantages of the outer thick tubing:

　　1. Low processing efficiency, serious waste of factory capacity;

　　2. Slip failure easily occurs under tensile load;

　　3. Can't meet the requirements of gas seal under higher pressure;

　　4. The performance of the upper shackle is not good and the anti-sticking ability is poor;

　　5. Limited thread repair;

　　6. Difficulty processing accessories such as short sections;

　　7. The tubing order cycle is long, the price remains high.

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