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a buttress thread API 5CT N80
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for the outside diameter is 4 / 10 / recommended practice field a buttress thread API 5CT N80
(1) diameter is 4 / 10 / torque buttress thread API 5CT N80 depending upon the value of the required at each joint tightening to torque value triangle mark line.
(2) the (5) and (6) joint out of the problem, should be careful analysis of the problem, to find a wrong. Should check threaded pipe and matched coupling thread. The thread has been damaged or not in compliance with the requirements of the thread should be repaired. If the reason is improper not thread damage or poor, so should adjust torque, in order to achieve the normal tightening connection.
(3) when using ordinary tongs is API 5CT N80, should hold to the right degree. Specification 4 / 7 for API 5CT N80, joint location should be at least more than hand tight position 3 ring; for specification 7 / and greater API 5CT N80, should be at least more than 3.5 times; but the specifications for the 9 /, 10 /, steel grade P110 API 5CT except N80, the pipe joint. Tighten the position should be more than 4 times hand position.
(4) remove to those joint standoff with problems, and the API 5CT N80. Inspection and repair. This work has been completed, with matching collar carefully check the thread has no damage. Remove the joint without maintenance or measure must not be re used, even if the injury is very little also not exception.
(5) if API 5CT N80 is the upper swing, too, that the thread may be related to the API 5CT N80 or API 5CT N80 different shaft bending, can reduce the wind speed, so as not to damage the thread. If you lower the tightening speed, API 5CT N80 still swing, it should be the API 5CT N80 unloading inspection. If the API 5CT N80 is located in the tube large tensile load under column in the site, should be carefully considered before use.
(6) at the scene immediately head, may be found by the factory machine tight collar end is still turning, this does not mean that the factory machine tight coupling and loose, but that scene is coupling end has reached the tightening degree of tight end machine factory.
(7) API 5CT N80 column should be careful of lifting and lowering, proceed carefully placed the slips, in order to avoid the mutation load caused by column fall, because even a short distance, may also make the column at the bottom of the coupling release. Care should be taken to avoid API 5CT N80 column, down to the bottom of the well tube columns, or the API 5CT N80 column with a bending of the risk in the well, especially the expansion of parts in borehole.
(8) in API 5CT N80 unloading operation, the breakout Tong should be located close to the collar, but not so close, as if API 5CT N80 connection is tight or API 5CT N80 lighter or both, will contact surface of the pipe in tong teeth plate inevitably appear slight flattening phenomenon. Between the collar and tongs if keeping equivalent pipe diameter 1/3 to 1/4 distance, usually to avoid unnecessary wear thread. Hammering coupling to loosen the practice is harmful, if need to tap, should use the hammer flat end, never use the tip, in any case not using hammer. Correct operation is in coupling tapping intermediate and its surrounding, must not be in the end or just in the opposite sides of percussion.
(9) previously proposed from coupling in API 5CT N80, should be careful to release all the threads, can't let API 5CT N80 from the collar suddenly jump out.
(10) all the threads shall be clean, and add the lubricating oil or coated with anticorrosive materials, making it possible to reduce corrosion. Tube well, should wear clean thread protector.
(11) API 5CT N80 in storage or re before use, should check the pipe body and screw, making marks on defective joints should be, to deliver maintenance and re measurement.
(12) when the API 5CT N80 for fracture and fracture recovery, with in-depth failure (Metallurgical) analysis, so as to avoid the recurrence of similar accidents, fault samples should try to recover the dead. When the failure analysis results show that the quality problem of fracture and pipe pipe in some way, please send the results feedback Tianjin Steel Pipe limited liability company live local office.
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