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the coupling in API 5CT N80
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The tightening or shackle
Below is the recommended practice API 5CT N80 field tightening.
The 1 outer diameter of 4 / 10 / recommended practice field tightening round thread API 5CT N80
(1) in the API 5CT N80 began well, should be a joint, to determine the required for normal tightening torque. These values can be explained with the table the optimum torque recommended value out of data is appropriate. If you select the optimum torque other values, the minimum torque value shall not be less than the optimal value of 75%, the maximum torque value shall not be higher than the optimal value of 125%.
(2) the power tongs should carry a high precision torque meter. In the initial stage of tightening, care should be taken to avoid any irregular tight or tightening speed, because they can reflect the wrong button, thread, pollution damage or other adverse circumstances. In order to prevent the screw thread damage, at the site of connection is tightened, a speed not exceeding 25 r/min.
(3) continue to tighten, and observe the indication and the face of the coupling in API 5CT N80 thread position relative to the vanishing point torque meter.
(4) the manual torque recommended list of best torque value is the best moment was selected for normal conditions tightened. If after tightening, collar and thread end of the vanishing point flush, or lead or lag the vanishing point within two threads, which shall be deemed the torque value is reasonable.
(5) a, if the thread disappear coverage point has more than two threads, and torque has not yet reached the minimum torque manual column values, the API 5CT N80 should be thrown out without.
(6) if the optimum torque value has been reached, while the number of threads also Lou in the outside, we can increase the torque continues to tighten, until it reaches the maximum torque of the recommended value. If the torque has reached the maximum torque values, spacing collar end pitch thread vanishing point distance is more than 3 threads, it should be the API 5CT N80 thrown out without.
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