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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